ftrace: add function tracing to single thread

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Impact: feature to function trace a single thread

This patch adds the ability to function trace a single thread.
The file:

  /debugfs/tracing/set_ftrace_pid

contains the pid to trace. Valid pids are any positive integer.
Writing any negative number to this file will disable the pid
tracing and the function tracer will go back to tracing all of
threads.

This feature works with both static and dynamic function tracing.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Steven Rostedt 2008-11-26 00:16:23 -05:00 • committed by Ingo Molnar

parent c2324b694f

commit df4fc31558

2 changed files with 262 additions and 26 deletions

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79

Documentation/ftrace.txt

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209

kernel/trace/ftrace.c

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