Steven Rostedt (Red Hat) dd42cd3ea9 tracing: Add function probe to trigger stack traces ...

Add a function probe that will cause a stack trace to be traced in
the ring buffer when the given function(s) are called.

format is:

 <function>:stacktrace[:<count>]

 echo 'schedule:stacktrace' > /debug/tracing/set_ftrace_filter
 cat /debug/tracing/trace_pipe
     kworker/2:0-4329  [002] ...2  2933.558007: <stack trace>
 => kthread
 => ret_from_fork
          <idle>-0     [000] .N.2  2933.558019: <stack trace>
 => rest_init
 => start_kernel
 => x86_64_start_reservations
 => x86_64_start_kernel
     kworker/2:0-4329  [002] ...2  2933.558109: <stack trace>
 => kthread
 => ret_from_fork
[...]

This can be set to only trace a specific amount of times:

 echo 'schedule:stacktrace:3' > /debug/tracing/set_ftrace_filter
 cat /debug/tracing/trace_pipe
           <...>-58    [003] ...2   841.801694: <stack trace>
 => kthread
 => ret_from_fork
          <idle>-0     [001] .N.2   841.801697: <stack trace>
 => start_secondary
           <...>-2059  [001] ...2   841.801736: <stack trace>
 => wait_for_common
 => wait_for_completion
 => flush_work
 => tty_flush_to_ldisc
 => input_available_p
 => n_tty_poll
 => tty_poll
 => do_select
 => core_sys_select
 => sys_select
 => system_call_fastpath

To remove these:

 echo '!schedule:stacktrace' > /debug/tracing/set_ftrace_filter
 echo '!schedule:stacktrace:0' > /debug/tracing/set_ftrace_filter

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2013-03-15 00:36:05 -04:00

..

blktrace.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

ftrace.c

ftrace: Use manual free after synchronize_sched() not call_rcu_sched()

2013-03-15 00:36:03 -04:00

Kconfig

tracing: Add config option to allow snapshot to swap per cpu

2013-03-15 00:35:47 -04:00

Makefile

trace: Stop compiling in trace_clock unconditionally

2012-09-13 22:52:08 -04:00

power-traces.c

perf: Clean up power events by introducing new, more generic ones

2011-01-04 08:16:54 +01:00

ring_buffer_benchmark.c

tracing: Use NUMA allocation for per-cpu ring buffer pages

2011-06-14 22:04:39 -04:00

ring_buffer.c

ring-buffer: Do not use schedule_work_on() for current CPU

2013-03-15 00:35:52 -04:00

rpm-traces.c

PM / Runtime: Introduce trace points for tracing rpm_* functions

2011-09-27 22:53:27 +02:00

trace_branch.c

tracing: Fix the branch tracer that broke with buffer change

2013-03-15 00:35:54 -04:00

trace_clock.c

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 17:49:41 -08:00

trace_entries.h

tracing: Add trace_puts() for even faster trace_printk() tracing

2013-03-15 00:35:55 -04:00

trace_event_perf.c

Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

2012-08-21 11:27:00 +02:00

trace_events_filter_test.h

tracing/filter: Add startup tests for events filter

2011-08-19 14:35:59 -04:00

trace_events_filter.c

tracing: Separate out trace events from global variables

2013-03-15 00:34:40 -04:00

trace_events.c

tracing: Add function probe triggers to enable/disable events

2013-03-15 00:36:04 -04:00

trace_export.c

tracing: Fix some section mismatch warnings

2013-03-15 00:34:54 -04:00

trace_functions_graph.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_functions.c

tracing: Add function probe to trigger stack traces

2013-03-15 00:36:05 -04:00

trace_irqsoff.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_kdb.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_kprobe.c

tracing: Use irq_work for wake ups and remove *_nowake_*() functions

2012-11-02 10:21:52 -04:00

trace_mmiotrace.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_nop.c

tracing/ftrace: make nop-tracer use polling wait for events on pipe

2009-03-23 09:22:15 +01:00

trace_output.c

tracing: Add trace_puts() for even faster trace_printk() tracing

2013-03-15 00:35:55 -04:00

trace_output.h

tracing: Add trace_puts() for even faster trace_printk() tracing

2013-03-15 00:35:55 -04:00

trace_printk.c

tracing: Add percpu buffers for trace_printk()

2012-04-23 21:15:55 -04:00

trace_probe.c

tracing: Replace strict_strto* with kstrto*

2012-10-31 16:45:23 -04:00

trace_probe.h

uprobes/tracing: Introduce is_trace_uprobe_enabled()

2013-02-08 18:24:30 +01:00

trace_sched_switch.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_sched_wakeup.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_selftest_dynamic.c

ftrace: Add self-tests for multiple function trace users

2011-05-18 19:24:51 -04:00

trace_selftest.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_stack.c

tracing: Remove unneeded checks from the stack tracer

2012-11-19 15:07:13 -05:00

trace_stat.c

include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h

2010-03-30 22:02:32 +09:00

trace_stat.h

tracing/stat: Add stat_release() callback

2009-07-10 12:14:05 +02:00

trace_syscalls.c

tracing: Consolidate max_tr into main trace_array structure

2013-03-15 00:35:40 -04:00

trace_uprobe.c

uprobes/perf: Avoid uprobe_apply() whenever possible

2013-02-08 18:28:08 +01:00

trace.c

tracing: Add skip argument to trace_dump_stack()

2013-03-15 00:36:05 -04:00

trace.h

tracing: Add internal ftrace trace_puts() for ftrace to use

2013-03-15 00:35:56 -04:00