========================
Copyright 2008 Red Hat Inc.
-Author: Steven Rostedt <srostedt@redhat.com>
+ Author: Steven Rostedt <srostedt@redhat.com>
+ License: The GNU Free Documentation License, Version 1.2
+ (dual licensed under the GPL v2)
+Reviewers: Elias Oltmanns, Randy Dunlap, Andrew Morton,
+ John Kacur, and David Teigland.
+Written for: 2.6.28-rc2
Introduction
------------
Ftrace is an internal tracer designed to help out developers and
designers of systems to find what is going on inside the kernel.
-It can be used for debugging or analyzing latencies and performance
-issues that take place outside of user-space.
+It can be used for debugging or analyzing latencies and
+performance issues that take place outside of user-space.
Although ftrace is the function tracer, it also includes an
-infrastructure that allows for other types of tracing. Some of the
-tracers that are currently in ftrace is a tracer to trace
-context switches, the time it takes for a high priority task to
-run after it was woken up, the time interrupts are disabled, and
-more.
+infrastructure that allows for other types of tracing. Some of
+the tracers that are currently in ftrace include a tracer to
+trace context switches, the time it takes for a high priority
+task to run after it was woken up, the time interrupts are
+disabled, and more (ftrace allows for tracer plugins, which
+means that the list of tracers can always grow).
The File System
---------------
-Ftrace uses the debugfs file system to hold the control files as well
-as the files to display output.
+Ftrace uses the debugfs file system to hold the control files as
+well as the files to display output.
To mount the debugfs system:
# mkdir /debug
# mount -t debugfs nodev /debug
+( Note: it is more common to mount at /sys/kernel/debug, but for
+ simplicity this document will use /debug)
That's it! (assuming that you have ftrace configured into your kernel)
Note: all time values are in microseconds.
- current_tracer : This is used to set or display the current tracer
- that is configured.
-
- available_tracers : This holds the different types of tracers that
- has been compiled into the kernel. The tracers
- listed here can be configured by echoing in their
- name into current_tracer.
-
- tracing_enabled : This sets or displays whether the current_tracer
- is activated and tracing or not. Echo 0 into this
- file to disable the tracer or 1 (or non-zero) to
- enable it.
-
- trace : This file holds the output of the trace in a human readable
- format.
-
- latency_trace : This file shows the same trace but the information
- is organized more to display possible latencies
- in the system.
-
- trace_pipe : The output is the same as the "trace" file but this
- file is meant to be streamed with live tracing.
- Reads from this file will block until new data
- is retrieved. Unlike the "trace" and "latency_trace"
- files, this file is a consumer. This means reading
- from this file causes sequential reads to display
- more current data. Once data is read from this
- file, it is consumed, and will not be read
- again with a sequential read. The "trace" and
- "latency_trace" files are static, and if the
- tracer isn't adding more data, they will display
- the same information every time they are read.
-
- iter_ctrl : This file lets the user control the amount of data
- that is displayed in one of the above output
- files.
-
- trace_max_latency : Some of the tracers record the max latency.
- For example, the time interrupts are disabled.
- This time is saved in this file. The max trace
- will also be stored, and displayed by either
- "trace" or "latency_trace". A new max trace will
- only be recorded if the latency is greater than
- the value in this file. (in microseconds)
-
- trace_entries : This sets or displays the number of trace
- entries each CPU buffer can hold. The tracer buffers
- are the same size for each CPU, so care must be
- taken when modifying the trace_entries. The number
- of actually entries will be the number given
- times the number of possible CPUS. The buffers
- are saved as individual pages, and the actual entries
- will always be rounded up to entries per page.
-
- This can only be updated when the current_tracer
- is set to "none".
-
- NOTE: It is planned on changing the allocated buffers
- from being the number of possible CPUS to
- the number of online CPUS.
-
- tracing_cpumask : This is a mask that lets the user only trace
- on specified CPUS. The format is a hex string
- representing the CPUS.
-
- set_ftrace_filter : When dynamic ftrace is configured in, the
- code is dynamically modified to disable calling
- of the function profiler (mcount). This lets
- tracing be configured in with practically no overhead
- in performance. This also has a side effect of
- enabling or disabling specific functions to be
- traced. Echoing in names of functions into this
- file will limit the trace to only those files.
-
- set_ftrace_notrace: This has the opposite effect that
- set_ftrace_filter has. Any function that is added
- here will not be traced. If a function exists
- in both set_ftrace_filter and set_ftrace_notrace
- the function will _not_ bet traced.
-
- available_filter_functions : When a function is encountered the first
- time by the dynamic tracer, it is recorded and
- later the call is converted into a nop. This file
- lists the functions that have been recorded
- by the dynamic tracer and these functions can
- be used to set the ftrace filter by the above
- "set_ftrace_filter" file.
+ current_tracer:
+
+ This is used to set or display the current tracer
+ that is configured.
+
+ available_tracers:
+
+ This holds the different types of tracers that
+ have been compiled into the kernel. The
+ tracers listed here can be configured by
+ echoing their name into current_tracer.
+
+ tracing_enabled:
+
+ This sets or displays whether the current_tracer
+ is activated and tracing or not. Echo 0 into this
+ file to disable the tracer or 1 to enable it.
+
+ trace:
+
+ This file holds the output of the trace in a human
+ readable format (described below).
+
+ latency_trace:
+
+ This file shows the same trace but the information
+ is organized more to display possible latencies
+ in the system (described below).
+
+ trace_pipe:
+
+ The output is the same as the "trace" file but this
+ file is meant to be streamed with live tracing.
+ Reads from this file will block until new data
+ is retrieved. Unlike the "trace" and "latency_trace"
+ files, this file is a consumer. This means reading
+ from this file causes sequential reads to display
+ more current data. Once data is read from this
+ file, it is consumed, and will not be read
+ again with a sequential read. The "trace" and
+ "latency_trace" files are static, and if the
+ tracer is not adding more data, they will display
+ the same information every time they are read.
+
+ trace_options:
+
+ This file lets the user control the amount of data
+ that is displayed in one of the above output
+ files.
+
+ tracing_max_latency:
+
+ Some of the tracers record the max latency.
+ For example, the time interrupts are disabled.
+ This time is saved in this file. The max trace
+ will also be stored, and displayed by either
+ "trace" or "latency_trace". A new max trace will
+ only be recorded if the latency is greater than
+ the value in this file. (in microseconds)
+
+ buffer_size_kb:
+
+ This sets or displays the number of kilobytes each CPU
+ buffer can hold. The tracer buffers are the same size
+ for each CPU. The displayed number is the size of the
+ CPU buffer and not total size of all buffers. The
+ trace buffers are allocated in pages (blocks of memory
+ that the kernel uses for allocation, usually 4 KB in size).
+ If the last page allocated has room for more bytes
+ than requested, the rest of the page will be used,
+ making the actual allocation bigger than requested.
+ ( Note, the size may not be a multiple of the page size
+ due to buffer managment overhead. )
+
+ This can only be updated when the current_tracer
+ is set to "nop".
+
+ tracing_cpumask:
+
+ This is a mask that lets the user only trace
+ on specified CPUS. The format is a hex string
+ representing the CPUS.
+
+ set_ftrace_filter:
+
+ When dynamic ftrace is configured in (see the
+ section below "dynamic ftrace"), the code is dynamically
+ modified (code text rewrite) to disable calling of the
+ function profiler (mcount). This lets tracing be configured
+ in with practically no overhead in performance. This also
+ has a side effect of enabling or disabling specific functions
+ to be traced. Echoing names of functions into this file
+ will limit the trace to only those functions.
+
+ set_ftrace_notrace:
+
+ This has an effect opposite to that of
+ set_ftrace_filter. Any function that is added here will not
+ be traced. If a function exists in both set_ftrace_filter
+ and set_ftrace_notrace, the function will _not_ be traced.
+
+ set_ftrace_pid:
+
+ Have the function tracer only trace a single thread.
+
+ set_graph_function:
+
+ Set a "trigger" function where tracing should start
+ with the function graph tracer (See the section
+ "dynamic ftrace" for more details).
+
+ available_filter_functions:
+
+ This lists the functions that ftrace
+ has processed and can trace. These are the function
+ names that you can pass to "set_ftrace_filter" or
+ "set_ftrace_notrace". (See the section "dynamic ftrace"
+ below for more details.)
The Tracers
-----------
-Here are the list of current tracers that can be configured.
+Here is the list of current tracers that may be configured.
+
+ "function"
- ftrace - function tracer that uses mcount to trace all functions.
- It is possible to filter out which functions that are
- traced when dynamic ftrace is configured in.
+ Function call tracer to trace all kernel functions.
- sched_switch - traces the context switches between tasks.
+ "function_graph_tracer"
- irqsoff - traces the areas that disable interrupts and saves off
- the trace with the longest max latency.
- See tracing_max_latency. When a new max is recorded,
- it replaces the old trace. It is best to view this
- trace with the latency_trace file.
+ Similar to the function tracer except that the
+ function tracer probes the functions on their entry
+ whereas the function graph tracer traces on both entry
+ and exit of the functions. It then provides the ability
+ to draw a graph of function calls similar to C code
+ source.
- preemptoff - Similar to irqsoff but traces and records the time
- preemption is disabled.
+ "sched_switch"
- preemptirqsoff - Similar to irqsoff and preemptoff, but traces and
- records the largest time irqs and/or preemption is
- disabled.
+ Traces the context switches and wakeups between tasks.
- wakeup - Traces and records the max latency that it takes for
- the highest priority task to get scheduled after
- it has been woken up.
+ "irqsoff"
- none - This is not a tracer. To remove all tracers from tracing
- simply echo "none" into current_tracer.
+ Traces the areas that disable interrupts and saves
+ the trace with the longest max latency.
+ See tracing_max_latency. When a new max is recorded,
+ it replaces the old trace. It is best to view this
+ trace via the latency_trace file.
+
+ "preemptoff"
+
+ Similar to irqsoff but traces and records the amount of
+ time for which preemption is disabled.
+
+ "preemptirqsoff"
+
+ Similar to irqsoff and preemptoff, but traces and
+ records the largest time for which irqs and/or preemption
+ is disabled.
+
+ "wakeup"
+
+ Traces and records the max latency that it takes for
+ the highest priority task to get scheduled after
+ it has been woken up.
+
+ "hw-branch-tracer"
+
+ Uses the BTS CPU feature on x86 CPUs to traces all
+ branches executed.
+
+ "nop"
+
+ This is the "trace nothing" tracer. To remove all
+ tracers from tracing simply echo "nop" into
+ current_tracer.
Examples of using the tracer
----------------------------
-Here are typical examples of using the tracers with only controlling
-them with the debugfs interface (without using any user-land utilities).
+Here are typical examples of using the tracers when controlling
+them only with the debugfs interface (without using any
+user-land utilities).
Output format:
--------------
-Here's an example of the output format of the file "trace"
+Here is an example of the output format of the file "trace"
--------
-# tracer: ftrace
+# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
bash-4251 [01] 10152.583855: _atomic_dec_and_lock <-dput
--------
-A header is printed with the trace that is represented. In this case
-the tracer is "ftrace". Then a header showing the format. Task name
-"bash", the task PID "4251", the CPU that it was running on
-"01", the timestamp in <secs>.<usecs> format, the function name that was
-traced "path_put" and the parent function that called this function
-"path_walk".
+A header is printed with the tracer name that is represented by
+the trace. In this case the tracer is "function". Then a header
+showing the format. Task name "bash", the task PID "4251", the
+CPU that it was running on "01", the timestamp in <secs>.<usecs>
+format, the function name that was traced "path_put" and the
+parent function that called this function "path_walk". The
+timestamp is the time at which the function was entered.
-The sched_switch tracer also includes tracing of task wake ups and
-context switches.
+The sched_switch tracer also includes tracing of task wakeups
+and context switches.
ksoftirqd/1-7 [01] 1453.070013: 7:115:R + 2916:115:S
ksoftirqd/1-7 [01] 1453.070013: 7:115:R + 10:115:S
kondemand/1-2916 [01] 1453.070013: 2916:115:S ==> 7:115:R
ksoftirqd/1-7 [01] 1453.070013: 7:115:S ==> 0:140:R
-Wake ups are represented by a "+" and the context switches show
-"==>". The format is:
+Wake ups are represented by a "+" and the context switches are
+shown as "==>". The format is:
Context switches:
<pid>:<prio>:<state> + <pid>:<prio>:<state>
-The prio is the internal kernel priority, which is inverse to the
-priority that is usually displayed by user-space tools. Zero represents
-the highest priority (99). Prio 100 starts the "nice" priorities with
-100 being equal to nice -20 and 139 being nice 19. The prio "140" is
-reserved for the idle task which is the lowest priority thread (pid 0).
+The prio is the internal kernel priority, which is the inverse
+of the priority that is usually displayed by user-space tools.
+Zero represents the highest priority (99). Prio 100 starts the
+"nice" priorities with 100 being equal to nice -20 and 139 being
+nice 19. The prio "140" is reserved for the idle task which is
+the lowest priority thread (pid 0).
Latency trace format
--------------------
-For traces that display latency times, the latency_trace file gives
-a bit more information to see why a latency happened. Here's a typical
-trace.
+For traces that display latency times, the latency_trace file
+gives somewhat more information to see why a latency happened.
+Here is a typical trace.
# tracer: irqsoff
#
<idle>-0 0d.s1 98us : trace_hardirqs_on (do_softirq)
-vim:ft=help
-
-
This shows that the current tracer is "irqsoff" tracing the time
-interrupts are disabled. It gives the trace version and the kernel
-this was executed on (2.6.26-rc8). Then it displays the max latency
-in microsecs (97 us). The number of trace entries displayed
-by the total number recorded (both are three: #3/3). The type of
-preemption that was used (PREEMPT). VP, KP, SP, and HP are always zero
-and reserved for later use. #P is the number of online CPUS (#P:2).
+for which interrupts were disabled. It gives the trace version
+and the version of the kernel upon which this was executed on
+(2.6.26-rc8). Then it displays the max latency in microsecs (97
+us). The number of trace entries displayed and the total number
+recorded (both are three: #3/3). The type of preemption that was
+used (PREEMPT). VP, KP, SP, and HP are always zero and are
+reserved for later use. #P is the number of online CPUS (#P:2).
-The task is the process that was running when the latency happened.
-(swapper pid: 0).
+The task is the process that was running when the latency
+occurred. (swapper pid: 0).
-The start and stop that caused the latencies:
+The start and stop (the functions in which the interrupts were
+disabled and enabled respectively) that caused the latencies:
apic_timer_interrupt is where the interrupts were disabled.
do_softirq is where they were enabled again.
pid: The PID of that process.
- CPU#: The CPU that the process was running on.
+ CPU#: The CPU which the process was running on.
irqs-off: 'd' interrupts are disabled. '.' otherwise.
+ Note: If the architecture does not support a way to
+ read the irq flags variable, an 'X' will always
+ be printed here.
need-resched: 'N' task need_resched is set, '.' otherwise.
hardirq/softirq:
- 'H' - hard irq happened inside a softirq.
+ 'H' - hard irq occurred inside a softirq.
'h' - hard irq is running
's' - soft irq is running
'.' - normal context.
The above is mostly meaningful for kernel developers.
- time: This differs from the trace output where as the trace output
- contained a absolute timestamp. This timestamp is relative
- to the start of the first entry in the the trace.
+ time: This differs from the trace file output. The trace file output
+ includes an absolute timestamp. The timestamp used by the
+ latency_trace file is relative to the start of the trace.
delay: This is just to help catch your eye a bit better. And
- needs to be fixed to be only relative to the same CPU.
- The marks is determined by the difference between this
- current trace and the next trace.
- '!' - greater than preempt_mark_thresh (default 100)
- '+' - greater than 1 microsecond
- ' ' - less than or equal to 1 microsecond.
+ needs to be fixed to be only relative to the same CPU.
+ The marks are determined by the difference between this
+ current trace and the next trace.
+ '!' - greater than preempt_mark_thresh (default 100)
+ '+' - greater than 1 microsecond
+ ' ' - less than or equal to 1 microsecond.
The rest is the same as the 'trace' file.
-iter_ctrl
----------
+trace_options
+-------------
-The iter_ctrl file is used to control what gets printed in the trace
-output. To see what is available, simply cat the file:
+The trace_options file is used to control what gets printed in
+the trace output. To see what is available, simply cat the file:
- cat /debug/tracing/iter_ctrl
+ cat /debug/tracing/trace_options
print-parent nosym-offset nosym-addr noverbose noraw nohex nobin \
- noblock nostacktrace nosched-tree
+ noblock nostacktrace nosched-tree nouserstacktrace nosym-userobj
-To disable one of the options, echo in the option appended with "no".
+To disable one of the options, echo in the option prepended with
+"no".
- echo noprint-parent > /debug/tracing/iter_ctrl
+ echo noprint-parent > /debug/tracing/trace_options
To enable an option, leave off the "no".
- echo sym-offest > /debug/tracing/iter_ctrl
+ echo sym-offset > /debug/tracing/trace_options
Here are the available options:
- print-parent - On function traces, display the calling function
- as well as the function being traced.
+ print-parent - On function traces, display the calling (parent)
+ function as well as the function being traced.
print-parent:
bash-4000 [01] 1477.606694: simple_strtoul <-strict_strtoul
bash-4000 [01] 1477.606694: simple_strtoul
- sym-offset - Display not only the function name, but also the offset
- in the function. For example, instead of seeing just
- "ktime_get" you will see "ktime_get+0xb/0x20"
+ sym-offset - Display not only the function name, but also the
+ offset in the function. For example, instead of
+ seeing just "ktime_get", you will see
+ "ktime_get+0xb/0x20".
sym-offset:
bash-4000 [01] 1477.606694: simple_strtoul+0x6/0xa0
- sym-addr - this will also display the function address as well as
- the function name.
+ sym-addr - this will also display the function address as well
+ as the function name.
sym-addr:
bash-4000 [01] 1477.606694: simple_strtoul <c0339346>
bash 4000 1 0 00000000 00010a95 [58127d26] 1720.415ms \
(+0.000ms): simple_strtoul (strict_strtoul)
- raw - This will display raw numbers. This option is best for use with
- user applications that can translate the raw numbers better than
- having it done in the kernel.
+ raw - This will display raw numbers. This option is best for
+ use with user applications that can translate the raw
+ numbers better than having it done in the kernel.
- hex - similar to raw, but the numbers will be in a hexadecimal format.
+ hex - Similar to raw, but the numbers will be in a hexadecimal
+ format.
bin - This will print out the formats in raw binary.
block - TBD (needs update)
- stacktrace - This is one of the options that changes the trace itself.
- When a trace is recorded, so is the stack of functions.
- This allows for back traces of trace sites.
+ stacktrace - This is one of the options that changes the trace
+ itself. When a trace is recorded, so is the stack
+ of functions. This allows for back traces of
+ trace sites.
+
+ userstacktrace - This option changes the trace. It records a
+ stacktrace of the current userspace thread.
- sched-tree - TBD (any users??)
+ sym-userobj - when user stacktrace are enabled, look up which
+ object the address belongs to, and print a
+ relative address. This is especially useful when
+ ASLR is on, otherwise you don't get a chance to
+ resolve the address to object/file/line after
+ the app is no longer running
+
+ The lookup is performed when you read
+ trace,trace_pipe,latency_trace. Example:
+
+ a.out-1623 [000] 40874.465068: /root/a.out[+0x480] <-/root/a.out[+0
+x494] <- /root/a.out[+0x4a8] <- /lib/libc-2.7.so[+0x1e1a6]
+
+ sched-tree - trace all tasks that are on the runqueue, at
+ every scheduling event. Will add overhead if
+ there's a lot of tasks running at once.
sched_switch
------------
-This tracer simply records schedule switches. Here's an example
-on how to implement it.
+This tracer simply records schedule switches. Here is an example
+of how to use it.
# echo sched_switch > /debug/tracing/current_tracer
# echo 1 > /debug/tracing/tracing_enabled
[...]
-As we have discussed previously about this format, the header shows
-the name of the trace and points to the options. The "FUNCTION"
-is a misnomer since here it represents the wake ups and context
-switches.
+As we have discussed previously about this format, the header
+shows the name of the trace and points to the options. The
+"FUNCTION" is a misnomer since here it represents the wake ups
+and context switches.
-The sched_switch only lists the wake ups (represented with '+')
-and context switches ('==>') with the previous task or current
-first followed by the next task or task waking up. The format for both
-of these is PID:KERNEL-PRIO:TASK-STATE. Remember that the KERNEL-PRIO
-is the inverse of the actual priority with zero (0) being the highest
-priority and the nice values starting at 100 (nice -20). Below is
-a quick chart to map the kernel priority to user land priorities.
+The sched_switch file only lists the wake ups (represented with
+'+') and context switches ('==>') with the previous task or
+current task first followed by the next task or task waking up.
+The format for both of these is PID:KERNEL-PRIO:TASK-STATE.
+Remember that the KERNEL-PRIO is the inverse of the actual
+priority with zero (0) being the highest priority and the nice
+values starting at 100 (nice -20). Below is a quick chart to map
+the kernel priority to user land priorities.
Kernel priority: 0 to 99 ==> user RT priority 99 to 0
Kernel priority: 100 to 139 ==> user nice -20 to 19
R - running : wants to run, may not actually be running
S - sleep : process is waiting to be woken up (handles signals)
- D - deep sleep : process must be woken up (ignores signals)
+ D - disk sleep (uninterruptible sleep) : process must be woken up
+ (ignores signals)
T - stopped : process suspended
t - traced : process is being traced (with something like gdb)
Z - zombie : process waiting to be cleaned up
ftrace_enabled
--------------
-The following tracers give different output depending on whether
-or not the sysctl ftrace_enabled is set. To set ftrace_enabled,
-one can either use the sysctl function or set it via the proc
-file system interface.
+The following tracers (listed below) give different output
+depending on whether or not the sysctl ftrace_enabled is set. To
+set ftrace_enabled, one can either use the sysctl function or
+set it via the proc file system interface.
sysctl kernel.ftrace_enabled=1
echo 1 > /proc/sys/kernel/ftrace_enabled
-To disable ftrace_enabled simply replace the '1' with '0' in
-the above commands.
+To disable ftrace_enabled simply replace the '1' with '0' in the
+above commands.
-When ftrace_enabled is set the tracers will also record the functions
-that are within the trace. The descriptions of the tracers
-will also show an example with ftrace enabled.
+When ftrace_enabled is set the tracers will also record the
+functions that are within the trace. The descriptions of the
+tracers will also show an example with ftrace enabled.
irqsoff
When interrupts are disabled, the CPU can not react to any other
external event (besides NMIs and SMIs). This prevents the timer
-interrupt from triggering or the mouse interrupt from letting the
-kernel know of a new mouse event. The result is a latency with the
-reaction time.
+interrupt from triggering or the mouse interrupt from letting
+the kernel know of a new mouse event. The result is a latency
+with the reaction time.
-The irqsoff tracer tracks the time interrupts are disabled and when
-they are re-enabled. When a new maximum latency is hit, it saves off
-the trace so that it may be retrieved at a later time. Every time a
-new maximum in reached, the old saved trace is discarded and the new
-trace is saved.
+The irqsoff tracer tracks the time for which interrupts are
+disabled. When a new maximum latency is hit, the tracer saves
+the trace leading up to that latency point so that every time a
+new maximum is reached, the old saved trace is discarded and the
+new trace is saved.
-To reset the maximum, echo 0 into tracing_max_latency. Here's an
-example:
+To reset the maximum, echo 0 into tracing_max_latency. Here is
+an example:
# echo irqsoff > /debug/tracing/current_tracer
# echo 0 > /debug/tracing/tracing_max_latency
# cat /debug/tracing/latency_trace
# tracer: irqsoff
#
-irqsoff latency trace v1.1.5 on 2.6.26-rc8
+irqsoff latency trace v1.1.5 on 2.6.26
--------------------------------------------------------------------
- latency: 6 us, #3/3, CPU#1 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
+ latency: 12 us, #3/3, CPU#1 | (M:preempt VP:0, KP:0, SP:0 HP:0 #P:2)
-----------------
- | task: bash-4269 (uid:0 nice:0 policy:0 rt_prio:0)
+ | task: bash-3730 (uid:0 nice:0 policy:0 rt_prio:0)
-----------------
- => started at: copy_page_range
- => ended at: copy_page_range
+ => started at: sys_setpgid
+ => ended at: sys_setpgid
# _------=> CPU#
# / _-----=> irqs-off
# ||||| delay
# cmd pid ||||| time | caller
# \ / ||||| \ | /
- bash-4269 1...1 0us+: _spin_lock (copy_page_range)
- bash-4269 1...1 7us : _spin_unlock (copy_page_range)
- bash-4269 1...2 7us : trace_preempt_on (copy_page_range)
+ bash-3730 1d... 0us : _write_lock_irq (sys_setpgid)
+ bash-3730 1d..1 1us+: _write_unlock_irq (sys_setpgid)
+ bash-3730 1d..2 14us : trace_hardirqs_on (sys_setpgid)
-vim:ft=help
+Here we see that that we had a latency of 12 microsecs (which is
+very good). The _write_lock_irq in sys_setpgid disabled
+interrupts. The difference between the 12 and the displayed
+timestamp 14us occurred because the clock was incremented
+between the time of recording the max latency and the time of
+recording the function that had that latency.
-Here we see that that we had a latency of 6 microsecs (which is
-very good). The spin_lock in copy_page_range disabled interrupts.
-The difference between the 6 and the displayed timestamp 7us is
-because the clock must have incremented between the time of recording
-the max latency and recording the function that had that latency.
-
-Note the above had ftrace_enabled not set. If we set the ftrace_enabled
-we get a much larger output:
+Note the above example had ftrace_enabled not set. If we set the
+ftrace_enabled, we get a much larger output:
# tracer: irqsoff
#
ls-4339 0d..2 51us : trace_hardirqs_on (__alloc_pages_internal)
-vim:ft=help
-
Here we traced a 50 microsecond latency. But we also see all the
-functions that were called during that time. Note that enabling
-function tracing we endure an added overhead. This overhead may
-extend the latency times. But never the less, this trace has provided
-some very helpful debugging.
+functions that were called during that time. Note that by
+enabling function tracing, we incur an added overhead. This
+overhead may extend the latency times. But nevertheless, this
+trace has provided some very helpful debugging information.
preemptoff
----------
-When preemption is disabled we may be able to receive interrupts but
-the task can not be preempted and a higher priority task must wait
-for preemption to be enabled again before it can preempt a lower
-priority task.
+When preemption is disabled, we may be able to receive
+interrupts but the task cannot be preempted and a higher
+priority task must wait for preemption to be enabled again
+before it can preempt a lower priority task.
-The preemptoff tracer traces the places that disables preemption.
-Like the irqsoff, it records the maximum latency that preemption
-was disabled. The control of preemptoff is much like the irqsoff.
+The preemptoff tracer traces the places that disable preemption.
+Like the irqsoff tracer, it records the maximum latency for
+which preemption was disabled. The control of preemptoff tracer
+is much like the irqsoff tracer.
# echo preemptoff > /debug/tracing/current_tracer
# echo 0 > /debug/tracing/tracing_max_latency
sshd-4261 0d.s1 30us : trace_preempt_on (__do_softirq)
-vim:ft=help
-
-This has some more changes. Preemption was disabled when an interrupt
-came in (notice the 'h'), and was enabled while doing a softirq.
-(notice the 's'). But we also see that interrupts have been disabled
-when entering the preempt off section and leaving it (the 'd').
-We do not know if interrupts were enabled in the mean time.
+This has some more changes. Preemption was disabled when an
+interrupt came in (notice the 'h'), and was enabled while doing
+a softirq. (notice the 's'). But we also see that interrupts
+have been disabled when entering the preempt off section and
+leaving it (the 'd'). We do not know if interrupts were enabled
+in the mean time.
# tracer: preemptoff
#
sshd-4261 0d.s1 64us : trace_preempt_on (__do_softirq)
-The above is an example of the preemptoff trace with ftrace_enabled
-set. Here we see that interrupts were disabled the entire time.
-The irq_enter code lets us know that we entered an interrupt 'h'.
-Before that, the functions being traced still show that it is not
-in an interrupt, but we can see by the functions themselves that
-this is not the case.
+The above is an example of the preemptoff trace with
+ftrace_enabled set. Here we see that interrupts were disabled
+the entire time. The irq_enter code lets us know that we entered
+an interrupt 'h'. Before that, the functions being traced still
+show that it is not in an interrupt, but we can see from the
+functions themselves that this is not the case.
-Notice that the __do_softirq when called doesn't have a preempt_count.
-It may seem that we missed a preempt enabled. What really happened
-is that the preempt count is held on the threads stack and we
-switched to the softirq stack (4K stacks in effect). The code
-does not copy the preempt count, but because interrupts are disabled
-we don't need to worry about it. Having a tracer like this is good
-to let people know what really happens inside the kernel.
+Notice that __do_softirq when called does not have a
+preempt_count. It may seem that we missed a preempt enabling.
+What really happened is that the preempt count is held on the
+thread's stack and we switched to the softirq stack (4K stacks
+in effect). The code does not copy the preempt count, but
+because interrupts are disabled, we do not need to worry about
+it. Having a tracer like this is good for letting people know
+what really happens inside the kernel.
preemptirqsoff
--------------
-Knowing the locations that have interrupts disabled or preemption
-disabled for the longest times is helpful. But sometimes we would
-like to know when either preemption and/or interrupts are disabled.
+Knowing the locations that have interrupts disabled or
+preemption disabled for the longest times is helpful. But
+sometimes we would like to know when either preemption and/or
+interrupts are disabled.
-The following code:
+Consider the following code:
local_irq_disable();
call_function_with_irqs_off();
call_function_with_irqs_and_preemption_off() and
call_function_with_preemption_off().
-But neither will trace the time that interrupts and/or preemption
-is disabled. This total time is the time that we can not schedule.
-To record this time, use the preemptirqsoff tracer.
+But neither will trace the time that interrupts and/or
+preemption is disabled. This total time is the time that we can
+not schedule. To record this time, use the preemptirqsoff
+tracer.
-Again, using this trace is much like the irqsoff and preemptoff tracers.
+Again, using this trace is much like the irqsoff and preemptoff
+tracers.
- # echo preemptoff > /debug/tracing/current_tracer
+ # echo preemptirqsoff > /debug/tracing/current_tracer
# echo 0 > /debug/tracing/tracing_max_latency
# echo 1 > /debug/tracing/tracing_enabled
# ls -ltr
ls-4860 0d.s1 294us : trace_preempt_on (__do_softirq)
-vim:ft=help
-
The trace_hardirqs_off_thunk is called from assembly on x86 when
-interrupts are disabled in the assembly code. Without the function
-tracing, we don't know if interrupts were enabled within the preemption
-points. We do see that it started with preemption enabled.
+interrupts are disabled in the assembly code. Without the
+function tracing, we do not know if interrupts were enabled
+within the preemption points. We do see that it started with
+preemption enabled.
Here is a trace with ftrace_enabled set:
sshd-4261 0d.s1 105us : trace_preempt_on (__do_softirq)
-This is a very interesting trace. It started with the preemption of
-the ls task. We see that the task had the "need_resched" bit set
-with the 'N' in the trace. Interrupts are disabled in the spin_lock
-and the trace started. We see that a schedule took place to run
-sshd. When the interrupts were enabled we took an interrupt.
-On return of the interrupt the softirq ran. We took another interrupt
-while running the softirq as we see with the capital 'H'.
+This is a very interesting trace. It started with the preemption
+of the ls task. We see that the task had the "need_resched" bit
+set via the 'N' in the trace. Interrupts were disabled before
+the spin_lock at the beginning of the trace. We see that a
+schedule took place to run sshd. When the interrupts were
+enabled, we took an interrupt. On return from the interrupt
+handler, the softirq ran. We took another interrupt while
+running the softirq as we see from the capital 'H'.
wakeup
------
-In Real-Time environment it is very important to know the wakeup
-time it takes for the highest priority task that wakes up to the
-time it executes. This is also known as "schedule latency".
-I stress the point that this is about RT tasks. It is also important
-to know the scheduling latency of non-RT tasks, but the average
-schedule latency is better for non-RT tasks. Tools like
-LatencyTop is more appropriate for such measurements.
-
-Real-Time environments is interested in the worst case latency.
-That is the longest latency it takes for something to happen, and
-not the average. We can have a very fast scheduler that may only
-have a large latency once in a while, but that would not work well
-with Real-Time tasks. The wakeup tracer was designed to record
-the worst case wakeups of RT tasks. Non-RT tasks are not recorded
-because the tracer only records one worst case and tracing non-RT
-tasks that are unpredictable will overwrite the worst case latency
-of RT tasks.
-
-Since this tracer only deals with RT tasks, we will run this slightly
-different than we did with the previous tracers. Instead of performing
-an 'ls' we will run 'sleep 1' under 'chrt' which changes the
-priority of the task.
+In a Real-Time environment it is very important to know the
+wakeup time it takes for the highest priority task that is woken
+up to the time that it executes. This is also known as "schedule
+latency". I stress the point that this is about RT tasks. It is
+also important to know the scheduling latency of non-RT tasks,
+but the average schedule latency is better for non-RT tasks.
+Tools like LatencyTop are more appropriate for such
+measurements.
+
+Real-Time environments are interested in the worst case latency.
+That is the longest latency it takes for something to happen,
+and not the average. We can have a very fast scheduler that may
+only have a large latency once in a while, but that would not
+work well with Real-Time tasks. The wakeup tracer was designed
+to record the worst case wakeups of RT tasks. Non-RT tasks are
+not recorded because the tracer only records one worst case and
+tracing non-RT tasks that are unpredictable will overwrite the
+worst case latency of RT tasks.
+
+Since this tracer only deals with RT tasks, we will run this
+slightly differently than we did with the previous tracers.
+Instead of performing an 'ls', we will run 'sleep 1' under
+'chrt' which changes the priority of the task.
# echo wakeup > /debug/tracing/current_tracer
# echo 0 > /debug/tracing/tracing_max_latency
<idle>-0 1d..4 4us : schedule (cpu_idle)
-vim:ft=help
-
+Running this on an idle system, we see that it only took 4
+microseconds to perform the task switch. Note, since the trace
+marker in the schedule is before the actual "switch", we stop
+the tracing when the recorded task is about to schedule in. This
+may change if we add a new marker at the end of the scheduler.
-Running this on an idle system we see that it only took 4 microseconds
-to perform the task switch. Note, since the trace marker in the
-schedule is before the actual "switch" we stop the tracing when
-the recorded task is about to schedule in. This may change if
-we add a new marker at the end of the scheduler.
-
-Notice that the recorded task is 'sleep' with the PID of 4901 and it
-has an rt_prio of 5. This priority is user-space priority and not
-the internal kernel priority. The policy is 1 for SCHED_FIFO and 2
-for SCHED_RR.
+Notice that the recorded task is 'sleep' with the PID of 4901
+and it has an rt_prio of 5. This priority is user-space priority
+and not the internal kernel priority. The policy is 1 for
+SCHED_FIFO and 2 for SCHED_RR.
Doing the same with chrt -r 5 and ftrace_enabled set.
ksoftirq-7 1d..6 49us : sub_preempt_count (_spin_unlock)
ksoftirq-7 1d..4 50us : schedule (__cond_resched)
-The interrupt went off while running ksoftirqd. This task runs at
-SCHED_OTHER. Why didn't we see the 'N' set early? This may be
-a harmless bug with x86_32 and 4K stacks. The need_reched() function
-that tests if we need to reschedule looks on the actual stack.
-Where as the setting of the NEED_RESCHED bit happens on the
-task's stack. But because we are in a hard interrupt, the test
-is with the interrupts stack which has that to be false. We don't
-see the 'N' until we switch back to the task's stack.
-
-ftrace
-------
-
-ftrace is not only the name of the tracing infrastructure, but it
-is also a name of one of the tracers. The tracer is the function
-tracer. Enabling the function tracer can be done from the
-debug file system. Make sure the ftrace_enabled is set otherwise
-this tracer is a nop.
+The interrupt went off while running ksoftirqd. This task runs
+at SCHED_OTHER. Why did not we see the 'N' set early? This may
+be a harmless bug with x86_32 and 4K stacks. On x86_32 with 4K
+stacks configured, the interrupt and softirq run with their own
+stack. Some information is held on the top of the task's stack
+(need_resched and preempt_count are both stored there). The
+setting of the NEED_RESCHED bit is done directly to the task's
+stack, but the reading of the NEED_RESCHED is done by looking at
+the current stack, which in this case is the stack for the hard
+interrupt. This hides the fact that NEED_RESCHED has been set.
+We do not see the 'N' until we switch back to the task's
+assigned stack.
+
+function
+--------
+
+This tracer is the function tracer. Enabling the function tracer
+can be done from the debug file system. Make sure the
+ftrace_enabled is set; otherwise this tracer is a nop.
# sysctl kernel.ftrace_enabled=1
- # echo ftrace > /debug/tracing/current_tracer
+ # echo function > /debug/tracing/current_tracer
# echo 1 > /debug/tracing/tracing_enabled
# usleep 1
# echo 0 > /debug/tracing/tracing_enabled
# cat /debug/tracing/trace
-# tracer: ftrace
+# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
[...]
-Note: It is sometimes better to enable or disable tracing directly from
-a program, because the buffer may be overflowed by the echo commands
-before you get to the point you want to trace. It is also easier to
-stop the tracing at the point that you hit the part that you are
-interested in. Since the ftrace buffer is a ring buffer with the
-oldest data being overwritten, usually it is sufficient to start the
-tracer with an echo command but have you code stop it. Something
-like the following is usually appropriate for this.
+Note: function tracer uses ring buffers to store the above
+entries. The newest data may overwrite the oldest data.
+Sometimes using echo to stop the trace is not sufficient because
+the tracing could have overwritten the data that you wanted to
+record. For this reason, it is sometimes better to disable
+tracing directly from a program. This allows you to stop the
+tracing at the point that you hit the part that you are
+interested in. To disable the tracing directly from a C program,
+something like following code snippet can be used:
int trace_fd;
[...]
trace_fd = open("/debug/tracing/tracing_enabled", O_WRONLY);
[...]
if (condition_hit()) {
- write(trace_fd, "0", 1);
+ write(trace_fd, "0", 1);
}
[...]
}
+Note: Here we hard coded the path name. The debugfs mount is not
+guaranteed to be at /debug (and is more commonly at
+/sys/kernel/debug). For simple one time traces, the above is
+sufficent. For anything else, a search through /proc/mounts may
+be needed to find where the debugfs file-system is mounted.
+
+
+Single thread tracing
+---------------------
+
+By writing into /debug/tracing/set_ftrace_pid you can trace a
+single thread. For example:
+
+# cat /debug/tracing/set_ftrace_pid
+no pid
+# echo 3111 > /debug/tracing/set_ftrace_pid
+# cat /debug/tracing/set_ftrace_pid
+3111
+# echo function > /debug/tracing/current_tracer
+# cat /debug/tracing/trace | head
+ # tracer: function
+ #
+ # TASK-PID CPU# TIMESTAMP FUNCTION
+ # | | | | |
+ yum-updatesd-3111 [003] 1637.254676: finish_task_switch <-thread_return
+ yum-updatesd-3111 [003] 1637.254681: hrtimer_cancel <-schedule_hrtimeout_range
+ yum-updatesd-3111 [003] 1637.254682: hrtimer_try_to_cancel <-hrtimer_cancel
+ yum-updatesd-3111 [003] 1637.254683: lock_hrtimer_base <-hrtimer_try_to_cancel
+ yum-updatesd-3111 [003] 1637.254685: fget_light <-do_sys_poll
+ yum-updatesd-3111 [003] 1637.254686: pipe_poll <-do_sys_poll
+# echo -1 > /debug/tracing/set_ftrace_pid
+# cat /debug/tracing/trace |head
+ # tracer: function
+ #
+ # TASK-PID CPU# TIMESTAMP FUNCTION
+ # | | | | |
+ ##### CPU 3 buffer started ####
+ yum-updatesd-3111 [003] 1701.957688: free_poll_entry <-poll_freewait
+ yum-updatesd-3111 [003] 1701.957689: remove_wait_queue <-free_poll_entry
+ yum-updatesd-3111 [003] 1701.957691: fput <-free_poll_entry
+ yum-updatesd-3111 [003] 1701.957692: audit_syscall_exit <-sysret_audit
+ yum-updatesd-3111 [003] 1701.957693: path_put <-audit_syscall_exit
+
+If you want to trace a function when executing, you could use
+something like this simple program:
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+int main (int argc, char **argv)
+{
+ if (argc < 1)
+ exit(-1);
+
+ if (fork() > 0) {
+ int fd, ffd;
+ char line[64];
+ int s;
+
+ ffd = open("/debug/tracing/current_tracer", O_WRONLY);
+ if (ffd < 0)
+ exit(-1);
+ write(ffd, "nop", 3);
+
+ fd = open("/debug/tracing/set_ftrace_pid", O_WRONLY);
+ s = sprintf(line, "%d\n", getpid());
+ write(fd, line, s);
+
+ write(ffd, "function", 8);
+
+ close(fd);
+ close(ffd);
+
+ execvp(argv[1], argv+1);
+ }
+
+ return 0;
+}
+
+
+hw-branch-tracer (x86 only)
+---------------------------
+
+This tracer uses the x86 last branch tracing hardware feature to
+collect a branch trace on all cpus with relatively low overhead.
+
+The tracer uses a fixed-size circular buffer per cpu and only
+traces ring 0 branches. The trace file dumps that buffer in the
+following format:
+
+# tracer: hw-branch-tracer
+#
+# CPU# TO <- FROM
+ 0 scheduler_tick+0xb5/0x1bf <- task_tick_idle+0x5/0x6
+ 2 run_posix_cpu_timers+0x2b/0x72a <- run_posix_cpu_timers+0x25/0x72a
+ 0 scheduler_tick+0x139/0x1bf <- scheduler_tick+0xed/0x1bf
+ 0 scheduler_tick+0x17c/0x1bf <- scheduler_tick+0x148/0x1bf
+ 2 run_posix_cpu_timers+0x9e/0x72a <- run_posix_cpu_timers+0x5e/0x72a
+ 0 scheduler_tick+0x1b6/0x1bf <- scheduler_tick+0x1aa/0x1bf
+
+
+The tracer may be used to dump the trace for the oops'ing cpu on
+a kernel oops into the system log. To enable this,
+ftrace_dump_on_oops must be set. To set ftrace_dump_on_oops, one
+can either use the sysctl function or set it via the proc system
+interface.
+
+ sysctl kernel.ftrace_dump_on_oops=1
+
+or
+
+ echo 1 > /proc/sys/kernel/ftrace_dump_on_oops
+
+
+Here's an example of such a dump after a null pointer
+dereference in a kernel module:
+
+[57848.105921] BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
+[57848.106019] IP: [<ffffffffa0000006>] open+0x6/0x14 [oops]
+[57848.106019] PGD 2354e9067 PUD 2375e7067 PMD 0
+[57848.106019] Oops: 0002 [#1] SMP
+[57848.106019] last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:20:05.0/local_cpus
+[57848.106019] Dumping ftrace buffer:
+[57848.106019] ---------------------------------
+[...]
+[57848.106019] 0 chrdev_open+0xe6/0x165 <- cdev_put+0x23/0x24
+[57848.106019] 0 chrdev_open+0x117/0x165 <- chrdev_open+0xfa/0x165
+[57848.106019] 0 chrdev_open+0x120/0x165 <- chrdev_open+0x11c/0x165
+[57848.106019] 0 chrdev_open+0x134/0x165 <- chrdev_open+0x12b/0x165
+[57848.106019] 0 open+0x0/0x14 [oops] <- chrdev_open+0x144/0x165
+[57848.106019] 0 page_fault+0x0/0x30 <- open+0x6/0x14 [oops]
+[57848.106019] 0 error_entry+0x0/0x5b <- page_fault+0x4/0x30
+[57848.106019] 0 error_kernelspace+0x0/0x31 <- error_entry+0x59/0x5b
+[57848.106019] 0 error_sti+0x0/0x1 <- error_kernelspace+0x2d/0x31
+[57848.106019] 0 page_fault+0x9/0x30 <- error_sti+0x0/0x1
+[57848.106019] 0 do_page_fault+0x0/0x881 <- page_fault+0x1a/0x30
+[...]
+[57848.106019] 0 do_page_fault+0x66b/0x881 <- is_prefetch+0x1ee/0x1f2
+[57848.106019] 0 do_page_fault+0x6e0/0x881 <- do_page_fault+0x67a/0x881
+[57848.106019] 0 oops_begin+0x0/0x96 <- do_page_fault+0x6e0/0x881
+[57848.106019] 0 trace_hw_branch_oops+0x0/0x2d <- oops_begin+0x9/0x96
+[...]
+[57848.106019] 0 ds_suspend_bts+0x2a/0xe3 <- ds_suspend_bts+0x1a/0xe3
+[57848.106019] ---------------------------------
+[57848.106019] CPU 0
+[57848.106019] Modules linked in: oops
+[57848.106019] Pid: 5542, comm: cat Tainted: G W 2.6.28 #23
+[57848.106019] RIP: 0010:[<ffffffffa0000006>] [<ffffffffa0000006>] open+0x6/0x14 [oops]
+[57848.106019] RSP: 0018:ffff880235457d48 EFLAGS: 00010246
+[...]
+
+
+function graph tracer
+---------------------------
+
+This tracer is similar to the function tracer except that it
+probes a function on its entry and its exit. This is done by
+using a dynamically allocated stack of return addresses in each
+task_struct. On function entry the tracer overwrites the return
+address of each function traced to set a custom probe. Thus the
+original return address is stored on the stack of return address
+in the task_struct.
+
+Probing on both ends of a function leads to special features
+such as:
+
+- measure of a function's time execution
+- having a reliable call stack to draw function calls graph
+
+This tracer is useful in several situations:
+
+- you want to find the reason of a strange kernel behavior and
+ need to see what happens in detail on any areas (or specific
+ ones).
+
+- you are experiencing weird latencies but it's difficult to
+ find its origin.
+
+- you want to find quickly which path is taken by a specific
+ function
+
+- you just want to peek inside a working kernel and want to see
+ what happens there.
+
+# tracer: function_graph
+#
+# CPU DURATION FUNCTION CALLS
+# | | | | | | |
+
+ 0) | sys_open() {
+ 0) | do_sys_open() {
+ 0) | getname() {
+ 0) | kmem_cache_alloc() {
+ 0) 1.382 us | __might_sleep();
+ 0) 2.478 us | }
+ 0) | strncpy_from_user() {
+ 0) | might_fault() {
+ 0) 1.389 us | __might_sleep();
+ 0) 2.553 us | }
+ 0) 3.807 us | }
+ 0) 7.876 us | }
+ 0) | alloc_fd() {
+ 0) 0.668 us | _spin_lock();
+ 0) 0.570 us | expand_files();
+ 0) 0.586 us | _spin_unlock();
+
+
+There are several columns that can be dynamically
+enabled/disabled. You can use every combination of options you
+want, depending on your needs.
+
+- The cpu number on which the function executed is default
+ enabled. It is sometimes better to only trace one cpu (see
+ tracing_cpu_mask file) or you might sometimes see unordered
+ function calls while cpu tracing switch.
+
+ hide: echo nofuncgraph-cpu > /debug/tracing/trace_options
+ show: echo funcgraph-cpu > /debug/tracing/trace_options
+
+- The duration (function's time of execution) is displayed on
+ the closing bracket line of a function or on the same line
+ than the current function in case of a leaf one. It is default
+ enabled.
+
+ hide: echo nofuncgraph-duration > /debug/tracing/trace_options
+ show: echo funcgraph-duration > /debug/tracing/trace_options
+
+- The overhead field precedes the duration field in case of
+ reached duration thresholds.
+
+ hide: echo nofuncgraph-overhead > /debug/tracing/trace_options
+ show: echo funcgraph-overhead > /debug/tracing/trace_options
+ depends on: funcgraph-duration
+
+ ie:
+
+ 0) | up_write() {
+ 0) 0.646 us | _spin_lock_irqsave();
+ 0) 0.684 us | _spin_unlock_irqrestore();
+ 0) 3.123 us | }
+ 0) 0.548 us | fput();
+ 0) + 58.628 us | }
+
+ [...]
+
+ 0) | putname() {
+ 0) | kmem_cache_free() {
+ 0) 0.518 us | __phys_addr();
+ 0) 1.757 us | }
+ 0) 2.861 us | }
+ 0) ! 115.305 us | }
+ 0) ! 116.402 us | }
+
+ + means that the function exceeded 10 usecs.
+ ! means that the function exceeded 100 usecs.
+
+
+- The task/pid field displays the thread cmdline and pid which
+ executed the function. It is default disabled.
+
+ hide: echo nofuncgraph-proc > /debug/tracing/trace_options
+ show: echo funcgraph-proc > /debug/tracing/trace_options
+
+ ie:
+
+ # tracer: function_graph
+ #
+ # CPU TASK/PID DURATION FUNCTION CALLS
+ # | | | | | | | | |
+ 0) sh-4802 | | d_free() {
+ 0) sh-4802 | | call_rcu() {
+ 0) sh-4802 | | __call_rcu() {
+ 0) sh-4802 | 0.616 us | rcu_process_gp_end();
+ 0) sh-4802 | 0.586 us | check_for_new_grace_period();
+ 0) sh-4802 | 2.899 us | }
+ 0) sh-4802 | 4.040 us | }
+ 0) sh-4802 | 5.151 us | }
+ 0) sh-4802 | + 49.370 us | }
+
+
+- The absolute time field is an absolute timestamp given by the
+ system clock since it started. A snapshot of this time is
+ given on each entry/exit of functions
+
+ hide: echo nofuncgraph-abstime > /debug/tracing/trace_options
+ show: echo funcgraph-abstime > /debug/tracing/trace_options
+
+ ie:
+
+ #
+ # TIME CPU DURATION FUNCTION CALLS
+ # | | | | | | | |
+ 360.774522 | 1) 0.541 us | }
+ 360.774522 | 1) 4.663 us | }
+ 360.774523 | 1) 0.541 us | __wake_up_bit();
+ 360.774524 | 1) 6.796 us | }
+ 360.774524 | 1) 7.952 us | }
+ 360.774525 | 1) 9.063 us | }
+ 360.774525 | 1) 0.615 us | journal_mark_dirty();
+ 360.774527 | 1) 0.578 us | __brelse();
+ 360.774528 | 1) | reiserfs_prepare_for_journal() {
+ 360.774528 | 1) | unlock_buffer() {
+ 360.774529 | 1) | wake_up_bit() {
+ 360.774529 | 1) | bit_waitqueue() {
+ 360.774530 | 1) 0.594 us | __phys_addr();
+
+
+You can put some comments on specific functions by using
+trace_printk() For example, if you want to put a comment inside
+the __might_sleep() function, you just have to include
+<linux/ftrace.h> and call trace_printk() inside __might_sleep()
+
+trace_printk("I'm a comment!\n")
+
+will produce:
+
+ 1) | __might_sleep() {
+ 1) | /* I'm a comment! */
+ 1) 1.449 us | }
+
+
+You might find other useful features for this tracer in the
+following "dynamic ftrace" section such as tracing only specific
+functions or tasks.
dynamic ftrace
--------------
-If CONFIG_DYNAMIC_FTRACE is set, then the system will run with
+If CONFIG_DYNAMIC_FTRACE is set, the system will run with
virtually no overhead when function tracing is disabled. The way
this works is the mcount function call (placed at the start of
-every kernel function, produced by the -pg switch in gcc), starts
-of pointing to a simple return.
-
-When dynamic ftrace is initialized, it calls kstop_machine to make it
-act like a uniprocessor so that it can freely modify code without
-worrying about other processors executing that same code. At
-initialization, the mcount calls are change to call a "record_ip"
-function. After this, the first time a kernel function is called,
-it has the calling address saved in a hash table.
-
-Later on the ftraced kernel thread is awoken and will again call
-kstop_machine if new functions have been recorded. The ftraced thread
-will change all calls to mcount to "nop". Just calling mcount
-and having mcount return has shown a 10% overhead. By converting
-it to a nop, there is no recordable overhead to the system.
+every kernel function, produced by the -pg switch in gcc),
+starts of pointing to a simple return. (Enabling FTRACE will
+include the -pg switch in the compiling of the kernel.)
+
+At compile time every C file object is run through the
+recordmcount.pl script (located in the scripts directory). This
+script will process the C object using objdump to find all the
+locations in the .text section that call mcount. (Note, only the
+.text section is processed, since processing other sections like
+.init.text may cause races due to those sections being freed).
+
+A new section called "__mcount_loc" is created that holds
+references to all the mcount call sites in the .text section.
+This section is compiled back into the original object. The
+final linker will add all these references into a single table.
+
+On boot up, before SMP is initialized, the dynamic ftrace code
+scans this table and updates all the locations into nops. It
+also records the locations, which are added to the
+available_filter_functions list. Modules are processed as they
+are loaded and before they are executed. When a module is
+unloaded, it also removes its functions from the ftrace function
+list. This is automatic in the module unload code, and the
+module author does not need to worry about it.
+
+When tracing is enabled, kstop_machine is called to prevent
+races with the CPUS executing code being modified (which can
+cause the CPU to do undesireable things), and the nops are
+patched back to calls. But this time, they do not call mcount
+(which is just a function stub). They now call into the ftrace
+infrastructure.
One special side-effect to the recording of the functions being
-traced, is that we can now selectively choose which functions we
-want to trace and which ones we want the mcount calls to remain as
-nops.
+traced is that we can now selectively choose which functions we
+wish to trace and which ones we want the mcount calls to remain
+as nops.
-Two files that contain to the enabling and disabling of recorded
-functions are:
+Two files are used, one for enabling and one for disabling the
+tracing of specified functions. They are:
set_ftrace_filter
set_ftrace_notrace
-A list of available functions that you can add to this files is listed
-in:
+A list of available functions that you can add to these files is
+listed in:
available_filter_functions
mutex_lock
[...]
-If I'm only interested in sys_nanosleep and hrtimer_interrupt:
+If I am only interested in sys_nanosleep and hrtimer_interrupt:
# echo sys_nanosleep hrtimer_interrupt \
> /debug/tracing/set_ftrace_filter
usleep-4134 [00] 1317.070111: sys_nanosleep <-syscall_call
<idle>-0 [00] 1317.070115: hrtimer_interrupt <-smp_apic_timer_interrupt
-To see what functions are being traced, you can cat the file:
+To see which functions are being traced, you can cat the file:
# cat /debug/tracing/set_ftrace_filter
hrtimer_interrupt
sys_nanosleep
-Perhaps this isn't enough. The filters also allow simple wild cards.
-Only the following is currently available
+Perhaps this is not enough. The filters also allow simple wild
+cards. Only the following are currently available
- <match>* - will match functions that begins with <match>
+ <match>* - will match functions that begin with <match>
*<match> - will match functions that end with <match>
*<match>* - will match functions that have <match> in it
-Thats all the wild cards that are allowed.
+These are the only wild cards which are supported.
<match>*<match> will not work.
- # echo hrtimer_* > /debug/tracing/set_ftrace_filter
+Note: It is better to use quotes to enclose the wild cards,
+ otherwise the shell may expand the parameters into names
+ of files in the local directory.
+
+ # echo 'hrtimer_*' > /debug/tracing/set_ftrace_filter
Produces:
To rewrite the filters, use '>'
To append to the filters, use '>>'
-To clear out a filter so that all functions will be recorded again.
+To clear out a filter so that all functions will be recorded
+again:
# echo > /debug/tracing/set_ftrace_filter
# cat /debug/tracing/set_ftrace_filter
# echo sys_nanosleep > /debug/tracing/set_ftrace_filter
# cat /debug/tracing/set_ftrace_filter
sys_nanosleep
- # echo hrtimer_* >> /debug/tracing/set_ftrace_filter
+ # echo 'hrtimer_*' >> /debug/tracing/set_ftrace_filter
# cat /debug/tracing/set_ftrace_filter
hrtimer_run_queues
hrtimer_run_pending
hrtimer_init_sleeper
-The set_ftrace_notrace prevents those functions from being traced.
+The set_ftrace_notrace prevents those functions from being
+traced.
# echo '*preempt*' '*lock*' > /debug/tracing/set_ftrace_notrace
We can see that there's no more lock or preempt tracing.
-ftraced
--------
-
-As mentioned above, when dynamic ftrace is configured in, a kernel
-thread wakes up once a second and checks to see if there are mcount
-calls that need to be converted into nops. If there is not, then
-it simply goes back to sleep. But if there is, it will call
-kstop_machine to convert the calls to nops.
-
-There may be a case that you do not want this added latency.
-Perhaps you are doing some audio recording and this activity might
-cause skips in the playback. There is an interface to disable
-and enable the ftraced kernel thread.
-
- # echo 0 > /debug/tracing/ftraced_enabled
-This will disable the calling of the kstop_machine to update the
-mcount calls to nops. Remember that there's a large overhead
-to calling mcount. Without this kernel thread, that overhead will
-exist.
-
-Any write to the ftraced_enabled file will cause the kstop_machine
-to run if there are recorded calls to mcount. This means that a
-user can manually perform the updates when they want to by simply
-echoing a '0' into the ftraced_enabled file.
-
-The updates are also done at the beginning of enabling a tracer
-that uses ftrace function recording.
+Dynamic ftrace with the function graph tracer
+---------------------------------------------
+
+Although what has been explained above concerns both the
+function tracer and the function-graph-tracer, there are some
+special features only available in the function-graph tracer.
+
+If you want to trace only one function and all of its children,
+you just have to echo its name into set_graph_function:
+
+ echo __do_fault > set_graph_function
+
+will produce the following "expanded" trace of the __do_fault()
+function:
+
+ 0) | __do_fault() {
+ 0) | filemap_fault() {
+ 0) | find_lock_page() {
+ 0) 0.804 us | find_get_page();
+ 0) | __might_sleep() {
+ 0) 1.329 us | }
+ 0) 3.904 us | }
+ 0) 4.979 us | }
+ 0) 0.653 us | _spin_lock();
+ 0) 0.578 us | page_add_file_rmap();
+ 0) 0.525 us | native_set_pte_at();
+ 0) 0.585 us | _spin_unlock();
+ 0) | unlock_page() {
+ 0) 0.541 us | page_waitqueue();
+ 0) 0.639 us | __wake_up_bit();
+ 0) 2.786 us | }
+ 0) + 14.237 us | }
+ 0) | __do_fault() {
+ 0) | filemap_fault() {
+ 0) | find_lock_page() {
+ 0) 0.698 us | find_get_page();
+ 0) | __might_sleep() {
+ 0) 1.412 us | }
+ 0) 3.950 us | }
+ 0) 5.098 us | }
+ 0) 0.631 us | _spin_lock();
+ 0) 0.571 us | page_add_file_rmap();
+ 0) 0.526 us | native_set_pte_at();
+ 0) 0.586 us | _spin_unlock();
+ 0) | unlock_page() {
+ 0) 0.533 us | page_waitqueue();
+ 0) 0.638 us | __wake_up_bit();
+ 0) 2.793 us | }
+ 0) + 14.012 us | }
+
+You can also expand several functions at once:
+
+ echo sys_open > set_graph_function
+ echo sys_close >> set_graph_function
+
+Now if you want to go back to trace all functions you can clear
+this special filter via:
+
+ echo > set_graph_function
trace_pipe
----------
-The trace_pipe outputs the same as trace, but the effect on the
-tracing is different. Every read from trace_pipe is consumed.
-This means that subsequent reads will be different. The trace
-is live.
+The trace_pipe outputs the same content as the trace file, but
+the effect on the tracing is different. Every read from
+trace_pipe is consumed. This means that subsequent reads will be
+different. The trace is live.
- # echo ftrace > /debug/tracing/current_tracer
+ # echo function > /debug/tracing/current_tracer
# cat /debug/tracing/trace_pipe > /tmp/trace.out &
[1] 4153
# echo 1 > /debug/tracing/tracing_enabled
# usleep 1
# echo 0 > /debug/tracing/tracing_enabled
# cat /debug/tracing/trace
-# tracer: ftrace
+# tracer: function
#
# TASK-PID CPU# TIMESTAMP FUNCTION
# | | | | |
bash-4043 [00] 41.267111: select_task_rq_rt <-try_to_wake_up
-Note, reading the trace_pipe will block until more input is added.
-By changing the tracer, trace_pipe will issue an EOF. We needed
-to set the ftrace tracer _before_ cating the trace_pipe file.
+Note, reading the trace_pipe file will block until more input is
+added. By changing the tracer, trace_pipe will issue an EOF. We
+needed to set the function tracer _before_ we "cat" the
+trace_pipe file.
trace entries
-------------
-Having too much or not enough data can be troublesome in diagnosing
-some issue in the kernel. The file trace_entries is used to modify
-the size of the internal trace buffers. The numbers listed
-is the number of entries that can be recorded per CPU. To know
-the full size, multiply the number of possible CPUS with the
-number of entries.
+Having too much or not enough data can be troublesome in
+diagnosing an issue in the kernel. The file buffer_size_kb is
+used to modify the size of the internal trace buffers. The
+number listed is the number of entries that can be recorded per
+CPU. To know the full size, multiply the number of possible CPUS
+with the number of entries.
- # cat /debug/tracing/trace_entries
-65620
+ # cat /debug/tracing/buffer_size_kb
+1408 (units kilobytes)
-Note, to modify this you must have tracing fulling disabled. To do that,
-echo "none" into the current_tracer.
+Note, to modify this, you must have tracing completely disabled.
+To do that, echo "nop" into the current_tracer. If the
+current_tracer is not set to "nop", an EINVAL error will be
+returned.
- # echo none > /debug/tracing/current_tracer
- # echo 100000 > /debug/tracing/trace_entries
- # cat /debug/tracing/trace_entries
-100045
+ # echo nop > /debug/tracing/current_tracer
+ # echo 10000 > /debug/tracing/buffer_size_kb
+ # cat /debug/tracing/buffer_size_kb
+10000 (units kilobytes)
+The number of pages which will be allocated is limited to a
+percentage of available memory. Allocating too much will produce
+an error.
-Notice that we echoed in 100,000 but the size is 100,045. The entries
-are held by individual pages. It allocates the number of pages it takes
-to fulfill the request. If more entries may fit on the last page
-it will add them.
-
- # echo 1 > /debug/tracing/trace_entries
- # cat /debug/tracing/trace_entries
-85
-
-This shows us that 85 entries can fit on a single page.
-
-The number of pages that will be allocated is a percentage of available
-memory. Allocating too much will produces an error.
-
- # echo 1000000000000 > /debug/tracing/trace_entries
+ # echo 1000000000000 > /debug/tracing/buffer_size_kb
-bash: echo: write error: Cannot allocate memory
- # cat /debug/tracing/trace_entries
+ # cat /debug/tracing/buffer_size_kb
85
+-----------
+
+More details can be found in the source code, in the
+kernel/tracing/*.c files.
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff