config NOP_TRACER
bool
+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_SYSCALL_TRACEPOINTS
+ bool
+ help
+ See Documentation/trace/ftrace-design.txt
+
config TRACER_MAX_TRACE
bool
config RING_BUFFER
bool
+config FTRACE_NMI_ENTER
+ bool
+ depends on HAVE_FTRACE_NMI_ENTER
+ 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 STACKTRACE if STACKTRACE_SUPPORT
select TRACEPOINTS
select NOP_TRACER
+ select BINARY_PRINTF
+ select EVENT_TRACING
-menu "Tracers"
+config GENERIC_TRACER
+ bool
+ select TRACING
+
+#
+# Minimum requirements an architecture has to meet for us to
+# be able to offer generic tracing facilities:
+#
+config TRACING_SUPPORT
+ bool
+ # PPC32 has no irqflags tracing support, but it can use most of the
+ # tracers anyway, they were tested to build and work. Note that new
+ # exceptions to this list aren't welcomed, better implement the
+ # irqflags tracing for your architecture.
+ depends on TRACE_IRQFLAGS_SUPPORT || PPC32
+ depends on STACKTRACE_SUPPORT
+ default y
+
+if TRACING_SUPPORT
+
+menuconfig FTRACE
+ bool "Tracers"
+ default y if DEBUG_KERNEL
+ help
+ Enable the kernel tracing infrastructure.
+
+if FTRACE
config FUNCTION_TRACER
bool "Kernel Function Tracer"
depends on HAVE_FUNCTION_TRACER
- depends on DEBUG_KERNEL
select FRAME_POINTER
- select TRACING
+ select KALLSYMS
+ 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.
- It's first purpose is to trace the duration of functions and
- draw a call graph for each thread with some informations like
- the return value.
- This is done by setting the current return address on the current
- task structure into a stack of calls.
+ 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
+ address on the current task structure into a stack of calls.
+
config IRQSOFF_TRACER
bool "Interrupts-off Latency Tracer"
default n
depends on TRACE_IRQFLAGS_SUPPORT
depends on GENERIC_TIME
- depends on DEBUG_KERNEL
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
- depends on DEBUG_KERNEL
- 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
tool.
config SCHED_TRACER
bool "Scheduling Latency Tracer"
- depends on DEBUG_KERNEL
- 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"
- depends on DEBUG_KERNEL
+config ENABLE_DEFAULT_TRACERS
+ bool "Trace process context switches and events"
+ depends on !GENERIC_TRACER
select TRACING
- select MARKERS
help
- This tracer gets called from the context switch and records
- all switching of tasks.
+ This tracer hooks to various trace points in the kernel,
+ allowing the user to pick and choose which trace point they
+ want to trace. It also includes the sched_switch tracer plugin.
+
+config FTRACE_SYSCALLS
+ bool "Trace syscalls"
+ 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"
- depends on DEBUG_KERNEL
- 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.
- ( Note that tracing self tests can't be enabled if this tracer is
- selected, because the self-tests are an initcall as well and that
- would invalidate the boot trace. )
+ 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 GENERIC_TRACER
+
+choice
+ prompt "Branch Profiling"
+ default BRANCH_PROFILE_NONE
+ help
+ The branch profiling is a software profiler. It will add hooks
+ into the C conditionals to test which path a branch takes.
+
+ 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
+ kernel. This profiler will also enable the likely/unlikely
+ profiler.
+
+ 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.
+
+config PROFILE_ANNOTATED_BRANCHES
bool "Trace likely/unlikely profiler"
- depends on DEBUG_KERNEL
- select TRACING
+ select TRACE_BRANCH_PROFILING
help
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.
- Say N if unsure.
-
config PROFILE_ALL_BRANCHES
bool "Profile all if conditionals"
- depends on TRACE_BRANCH_PROFILING
+ select TRACE_BRANCH_PROFILING
help
This tracer profiles all branch conditions. Every if ()
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
-
- Say N if unsure.
+ is to be analyzed in much detail.
+endchoice
config TRACING_BRANCHES
bool
Say N if unsure.
+config KSYM_TRACER
+ bool "Trace read and write access on kernel memory locations"
+ depends on HAVE_HW_BREAKPOINT
+ select TRACING
+ help
+ 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"
depends on HAVE_FUNCTION_TRACER
- depends on DEBUG_KERNEL
select FUNCTION_TRACER
select STACKTRACE
+ 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
- stack-trace saved. Because this logic has to execute in every
- kernel function, all the time, this option can slow down the
- kernel measurably and is generally intended for kernel
- developers only.
+ stack-trace saved. If this is configured with DYNAMIC_FTRACE
+ then it will not have any overhead while the stack tracer
+ is disabled.
+
+ To enable the stack tracer on bootup, pass in 'stacktrace'
+ on the kernel command line.
+
+ The stack tracer can also be enabled or disabled via the
+ sysctl kernel.stack_tracer_enabled
Say N if unsure.
-config BTS_TRACER
+config HW_BRANCH_TRACER
depends on HAVE_HW_BRANCH_TRACER
- bool "Trace branches"
- select TRACING
+ bool "Trace hw branches"
+ select GENERIC_TRACER
help
This tracer records all branches on the system in a circular
- buffer giving access to the last N branches for each cpu.
+ buffer, giving access to the last N branches for each cpu.
+
+config KMEMTRACE
+ bool "Trace SLAB allocations"
+ select GENERIC_TRACER
+ help
+ kmemtrace provides tracing for slab allocator functions, such as
+ 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
+ and profile kernel code.
+
+ This requires an userspace application to use. See
+ Documentation/trace/kmemtrace.txt for more information.
+
+ Saying Y will make the kernel somewhat larger and slower. However,
+ if you disable kmemtrace at run-time or boot-time, the performance
+ impact is minimal (depending on the arch the kernel is built for).
+
+ If unsure, say N.
+
+config WORKQUEUE_TRACER
+ bool "Trace workqueues"
+ select GENERIC_TRACER
+ help
+ 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 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.
+
+config BLK_DEV_IO_TRACE
+ bool "Support for tracing block IO actions"
+ depends on SYSFS
+ depends on BLOCK
+ select RELAY
+ select DEBUG_FS
+ select TRACEPOINTS
+ select GENERIC_TRACER
+ select STACKTRACE
+ help
+ Say Y here if you want to be able to trace the block layer actions
+ on a given queue. Tracing allows you to see any traffic happening
+ on a block device queue. For more information (and the userspace
+ support tools needed), fetch the blktrace tools from:
+
+ git://git.kernel.dk/blktrace.git
+
+ Tracing also is possible using the ftrace interface, e.g.:
+
+ echo 1 > /sys/block/sda/sda1/trace/enable
+ echo blk > /sys/kernel/debug/tracing/current_tracer
+ cat /sys/kernel/debug/tracing/trace_pipe
+
+ 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
- depends on DEBUG_KERNEL
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.
+
+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 "functions" file is created in
+ the trace_stats directory; this file shows the list of functions that
+ have been hit and their counters.
- 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.
+ 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 && DEBUG_KERNEL && !BOOT_TRACER
+ 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.
-endmenu
+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 GENERIC_TRACER
+ help
+ Mmiotrace traces Memory Mapped I/O access and is meant for
+ debugging and reverse engineering. It is called from the ioremap
+ implementation and works via page faults. Tracing is disabled by
+ default and can be enabled at run-time.
+
+ See Documentation/trace/mmiotrace.txt.
+ If you are not helping to develop drivers, say N.
+
+config MMIOTRACE_TEST
+ tristate "Test module for mmiotrace"
+ depends on MMIOTRACE && m
+ help
+ This is a dumb module for testing mmiotrace. It is very dangerous
+ as it will write garbage to IO memory starting at a given address.
+ However, it should be safe to use on e.g. unused portion of VRAM.
+
+ 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
+
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