config HAVE_FTRACE_NMI_ENTER
bool
+ help
+ See Documentation/trace/ftrace-design.txt
config HAVE_FUNCTION_TRACER
bool
+ help
+ See Documentation/trace/ftrace-design.txt
config HAVE_FUNCTION_GRAPH_TRACER
bool
+ help
+ See Documentation/trace/ftrace-design.txt
+
+config HAVE_FUNCTION_GRAPH_FP_TEST
+ bool
+ help
+ See Documentation/trace/ftrace-design.txt
config HAVE_FUNCTION_TRACE_MCOUNT_TEST
bool
help
- This gets selected when the arch tests the function_trace_stop
- variable at the mcount call site. Otherwise, this variable
- is tested by the called function.
+ See Documentation/trace/ftrace-design.txt
config HAVE_DYNAMIC_FTRACE
bool
+ help
+ See Documentation/trace/ftrace-design.txt
config HAVE_FTRACE_MCOUNT_RECORD
bool
+ help
+ See Documentation/trace/ftrace-design.txt
-config HAVE_HW_BRANCH_TRACER
- bool
-
-config HAVE_FTRACE_SYSCALLS
+config HAVE_SYSCALL_TRACEPOINTS
bool
+ help
+ See Documentation/trace/ftrace-design.txt
config TRACER_MAX_TRACE
bool
default y
config EVENT_TRACING
+ select CONTEXT_SWITCH_TRACER
bool
+config CONTEXT_SWITCH_TRACER
+ bool
+
+config RING_BUFFER_ALLOW_SWAP
+ bool
+ help
+ Allow the use of ring_buffer_swap_cpu.
+ Adds a very slight overhead to tracing when enabled.
+
+# All tracer options should select GENERIC_TRACER. For those options that are
+# enabled by all tracers (context switch and event tracer) they select TRACING.
+# This allows those options to appear when no other tracer is selected. But the
+# options do not appear when something else selects it. We need the two options
+# GENERIC_TRACER and TRACING to avoid circular dependencies to accomplish the
+# hiding of the automatic options.
+
config TRACING
bool
select DEBUG_FS
select BINARY_PRINTF
select EVENT_TRACING
+config GENERIC_TRACER
+ bool
+ select TRACING
+
#
# Minimum requirements an architecture has to meet for us to
# be able to offer generic tracing facilities:
menuconfig FTRACE
bool "Tracers"
+ default y if DEBUG_KERNEL
help
- Enable the kernel tracing infrastructure.
+ Enable the kernel tracing infrastructure.
if FTRACE
depends on HAVE_FUNCTION_TRACER
select FRAME_POINTER
select KALLSYMS
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
help
Enable the kernel to trace every kernel function. This is done
by using a compiler feature to insert a small, 5-byte No-Operation
- instruction to the beginning of every kernel function, which NOP
+ instruction at the beginning of every kernel function, which NOP
sequence is then dynamically patched into a tracer call when
tracing is enabled by the administrator. If it's runtime disabled
(the bootup default), then the overhead of the instructions is very
bool "Kernel Function Graph Tracer"
depends on HAVE_FUNCTION_GRAPH_TRACER
depends on FUNCTION_TRACER
+ depends on !X86_32 || !CC_OPTIMIZE_FOR_SIZE
default y
help
Enable the kernel to trace a function at both its return
and its entry.
Its first purpose is to trace the duration of functions and
draw a call graph for each thread with some information like
- the return value. This is done by setting the current return
+ the return value. This is done by setting the current return
address on the current task structure into a stack of calls.
depends on TRACE_IRQFLAGS_SUPPORT
depends on GENERIC_TIME
select TRACE_IRQFLAGS
- select TRACING
+ select GENERIC_TRACER
select TRACER_MAX_TRACE
+ select RING_BUFFER_ALLOW_SWAP
help
This option measures the time spent in irqs-off critical
sections, with microsecond accuracy.
disabled by default and can be runtime (re-)started
via:
- echo 0 > /debugfs/tracing/tracing_max_latency
+ echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
- (Note that kernel size and overhead increases with this option
+ (Note that kernel size and overhead increase with this option
enabled. This option and the preempt-off timing option can be
used together or separately.)
default n
depends on GENERIC_TIME
depends on PREEMPT
- select TRACING
+ select GENERIC_TRACER
select TRACER_MAX_TRACE
+ select RING_BUFFER_ALLOW_SWAP
help
- This option measures the time spent in preemption off critical
+ This option measures the time spent in preemption-off critical
sections, with microsecond accuracy.
The default measurement method is a maximum search, which is
disabled by default and can be runtime (re-)started
via:
- echo 0 > /debugfs/tracing/tracing_max_latency
+ echo 0 > /sys/kernel/debug/tracing/tracing_max_latency
- (Note that kernel size and overhead increases with this option
+ (Note that kernel size and overhead increase with this option
enabled. This option and the irqs-off timing option can be
used together or separately.)
config SYSPROF_TRACER
bool "Sysprof Tracer"
depends on X86
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
help
This tracer provides the trace needed by the 'Sysprof' userspace
config SCHED_TRACER
bool "Scheduling Latency Tracer"
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
select TRACER_MAX_TRACE
help
This tracer tracks the latency of the highest priority task
to be scheduled in, starting from the point it has woken up.
-config CONTEXT_SWITCH_TRACER
- bool "Trace process context switches"
- select TRACING
- select MARKERS
- help
- This tracer gets called from the context switch and records
- all switching of tasks.
-
-config EVENT_TRACER
- bool "Trace various events in the kernel"
+config ENABLE_DEFAULT_TRACERS
+ bool "Trace process context switches and events"
+ depends on !GENERIC_TRACER
select TRACING
help
- This tracer hooks to various trace points in the kernel
+ This tracer hooks to various trace points in the kernel,
allowing the user to pick and choose which trace point they
- want to trace.
+ want to trace. It also includes the sched_switch tracer plugin.
config FTRACE_SYSCALLS
bool "Trace syscalls"
- depends on HAVE_FTRACE_SYSCALLS
- select TRACING
+ depends on HAVE_SYSCALL_TRACEPOINTS
+ select GENERIC_TRACER
select KALLSYMS
help
Basic tracer to catch the syscall entry and exit events.
config BOOT_TRACER
bool "Trace boot initcalls"
- select TRACING
+ select GENERIC_TRACER
select CONTEXT_SWITCH_TRACER
help
This tracer helps developers to optimize boot times: it records
the timings of the initcalls and traces key events and the identity
of tasks that can cause boot delays, such as context-switches.
- Its aim is to be parsed by the /scripts/bootgraph.pl tool to
+ Its aim is to be parsed by the scripts/bootgraph.pl tool to
produce pretty graphics about boot inefficiencies, giving a visual
representation of the delays during initcalls - but the raw
/debug/tracing/trace text output is readable too.
- You must pass in ftrace=initcall to the kernel command line
- to enable this on bootup.
+ You must pass in initcall_debug and ftrace=initcall to the kernel
+ command line to enable this on bootup.
config TRACE_BRANCH_PROFILING
bool
- select TRACING
+ select GENERIC_TRACER
choice
prompt "Branch Profiling"
The likely/unlikely profiler only looks at the conditions that
are annotated with a likely or unlikely macro.
- The "all branch" profiler will profile every if statement in the
+ The "all branch" profiler will profile every if-statement in the
kernel. This profiler will also enable the likely/unlikely
- profiler as well.
+ profiler.
- Either of the above profilers add a bit of overhead to the system.
- If unsure choose "No branch profiling".
+ Either of the above profilers adds a bit of overhead to the system.
+ If unsure, choose "No branch profiling".
config BRANCH_PROFILE_NONE
bool "No branch profiling"
help
- No branch profiling. Branch profiling adds a bit of overhead.
- Only enable it if you want to analyse the branching behavior.
- Otherwise keep it disabled.
+ No branch profiling. Branch profiling adds a bit of overhead.
+ Only enable it if you want to analyse the branching behavior.
+ Otherwise keep it disabled.
config PROFILE_ANNOTATED_BRANCHES
bool "Trace likely/unlikely profiler"
This tracer profiles all the the likely and unlikely macros
in the kernel. It will display the results in:
- /debugfs/tracing/profile_annotated_branch
+ /sys/kernel/debug/tracing/profile_annotated_branch
- Note: this will add a significant overhead, only turn this
+ Note: this will add a significant overhead; only turn this
on if you need to profile the system's use of these macros.
config PROFILE_ALL_BRANCHES
taken in the kernel is recorded whether it hit or miss.
The results will be displayed in:
- /debugfs/tracing/profile_branch
+ /sys/kernel/debug/tracing/profile_branch
This option also enables the likely/unlikely profiler.
This configuration, when enabled, will impose a great overhead
on the system. This should only be enabled when the system
- is to be analyzed
+ is to be analyzed in much detail.
endchoice
config TRACING_BRANCHES
Say N if unsure.
-config POWER_TRACER
- bool "Trace power consumption behavior"
- depends on X86
+config KSYM_TRACER
+ bool "Trace read and write access on kernel memory locations"
+ depends on HAVE_HW_BREAKPOINT
select TRACING
help
- This tracer helps developers to analyze and optimize the kernels
- power management decisions, specifically the C-state and P-state
- behavior.
+ This tracer helps find read and write operations on any given kernel
+ symbol i.e. /proc/kallsyms.
+config PROFILE_KSYM_TRACER
+ bool "Profile all kernel memory accesses on 'watched' variables"
+ depends on KSYM_TRACER
+ help
+ This tracer profiles kernel accesses on variables watched through the
+ ksym tracer ftrace plugin. Depending upon the hardware, all read
+ and write operations on kernel variables can be monitored for
+ accesses.
+
+ The results will be displayed in:
+ /debugfs/tracing/profile_ksym
+
+ Say N if unsure.
config STACK_TRACER
bool "Trace max stack"
select KALLSYMS
help
This special tracer records the maximum stack footprint of the
- kernel and displays it in debugfs/tracing/stack_trace.
+ kernel and displays it in /sys/kernel/debug/tracing/stack_trace.
This tracer works by hooking into every function call that the
kernel executes, and keeping a maximum stack depth value and
Say N if unsure.
-config HW_BRANCH_TRACER
- depends on HAVE_HW_BRANCH_TRACER
- bool "Trace hw branches"
- select TRACING
- help
- This tracer records all branches on the system in a circular
- buffer giving access to the last N branches for each cpu.
-
config KMEMTRACE
bool "Trace SLAB allocations"
- select TRACING
+ select GENERIC_TRACER
help
kmemtrace provides tracing for slab allocator functions, such as
- kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
+ kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
data is then fed to the userspace application in order to analyse
allocation hotspots, internal fragmentation and so on, making it
possible to see how well an allocator performs, as well as debug
config WORKQUEUE_TRACER
bool "Trace workqueues"
- select TRACING
+ select GENERIC_TRACER
help
- The workqueue tracer provides some statistical informations
+ The workqueue tracer provides some statistical information
about each cpu workqueue thread such as the number of the
works inserted and executed since their creation. It can help
- to evaluate the amount of work each of them have to perform.
+ to evaluate the amount of work each of them has to perform.
For example it can help a developer to decide whether he should
- choose a per cpu workqueue instead of a singlethreaded one.
+ choose a per-cpu workqueue instead of a singlethreaded one.
config BLK_DEV_IO_TRACE
- bool "Support for tracing block io actions"
+ bool "Support for tracing block IO actions"
depends on SYSFS
depends on BLOCK
select RELAY
select DEBUG_FS
select TRACEPOINTS
- select TRACING
+ select GENERIC_TRACER
select STACKTRACE
help
Say Y here if you want to be able to trace the block layer actions
If unsure, say N.
+config KPROBE_EVENT
+ depends on KPROBES
+ depends on HAVE_REGS_AND_STACK_ACCESS_API
+ bool "Enable kprobes-based dynamic events"
+ select TRACING
+ default y
+ help
+ This allows the user to add tracing events (similar to tracepoints)
+ on the fly via the ftrace interface. See
+ Documentation/trace/kprobetrace.txt for more details.
+
+ Those events can be inserted wherever kprobes can probe, and record
+ various register and memory values.
+
+ This option is also required by perf-probe subcommand of perf tools.
+ If you want to use perf tools, this option is strongly recommended.
+
config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"
depends on FUNCTION_TRACER
depends on HAVE_DYNAMIC_FTRACE
default y
help
- This option will modify all the calls to ftrace dynamically
- (will patch them out of the binary image and replaces them
- with a No-Op instruction) as they are called. A table is
- created to dynamically enable them again.
+ This option will modify all the calls to ftrace dynamically
+ (will patch them out of the binary image and replace them
+ with a No-Op instruction) as they are called. A table is
+ created to dynamically enable them again.
- This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but otherwise
- has native performance as long as no tracing is active.
+ This way a CONFIG_FUNCTION_TRACER kernel is slightly larger, but
+ otherwise has native performance as long as no tracing is active.
- The changes to the code are done by a kernel thread that
- wakes up once a second and checks to see if any ftrace calls
- were made. If so, it runs stop_machine (stops all CPUS)
- and modifies the code to jump over the call to ftrace.
+ The changes to the code are done by a kernel thread that
+ wakes up once a second and checks to see if any ftrace calls
+ were made. If so, it runs stop_machine (stops all CPUS)
+ and modifies the code to jump over the call to ftrace.
config FUNCTION_PROFILER
bool "Kernel function profiler"
depends on FUNCTION_TRACER
default n
help
- This option enables the kernel function profiler. A file is created
- in debugfs called function_profile_enabled which defaults to zero.
- When a 1 is echoed into this file profiling begins, and when a
- zero is entered, profiling stops. A file in the trace_stats
- directory called functions, that show the list of functions that
- have been hit and their counters.
+ This option enables the kernel function profiler. A file is created
+ in debugfs called function_profile_enabled which defaults to zero.
+ When a 1 is echoed into this file profiling begins, and when a
+ zero is entered, profiling stops. A "functions" file is created in
+ the trace_stats directory; this file shows the list of functions that
+ have been hit and their counters.
- If in doubt, say N
+ If in doubt, say N.
config FTRACE_MCOUNT_RECORD
def_bool y
config FTRACE_STARTUP_TEST
bool "Perform a startup test on ftrace"
- depends on TRACING
+ depends on GENERIC_TRACER
select FTRACE_SELFTEST
help
This option performs a series of startup tests on ftrace. On bootup
functioning properly. It will do tests on all the configured
tracers of ftrace.
+config EVENT_TRACE_TEST_SYSCALLS
+ bool "Run selftest on syscall events"
+ depends on FTRACE_STARTUP_TEST
+ help
+ This option will also enable testing every syscall event.
+ It only enables the event and disables it and runs various loads
+ with the event enabled. This adds a bit more time for kernel boot
+ up since it runs this on every system call defined.
+
+ TBD - enable a way to actually call the syscalls as we test their
+ events
+
config MMIOTRACE
bool "Memory mapped IO tracing"
depends on HAVE_MMIOTRACE_SUPPORT && PCI
- select TRACING
+ select GENERIC_TRACER
help
Mmiotrace traces Memory Mapped I/O access and is meant for
debugging and reverse engineering. It is called from the ioremap
Say N, unless you absolutely know what you are doing.
+config RING_BUFFER_BENCHMARK
+ tristate "Ring buffer benchmark stress tester"
+ depends on RING_BUFFER
+ help
+ This option creates a test to stress the ring buffer and benchmark it.
+ It creates its own ring buffer such that it will not interfere with
+ any other users of the ring buffer (such as ftrace). It then creates
+ a producer and consumer that will run for 10 seconds and sleep for
+ 10 seconds. Each interval it will print out the number of events
+ it recorded and give a rough estimate of how long each iteration took.
+
+ It does not disable interrupts or raise its priority, so it may be
+ affected by processes that are running.
+
+ If unsure, say N.
+
endif # FTRACE
endif # TRACING_SUPPORT