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locking: Add lock contention tracepoints

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This adds two new lock contention tracepoints like below:

 * lock:contention_begin
 * lock:contention_end

The lock:contention_begin takes a flags argument to classify locks.  I
found it useful to identify what kind of locks it's tracing like if
it's spinning or sleeping, reader-writer lock, real-time, and per-cpu.

Move tracepoint definitions into mutex.c so that we can use them
without lockdep.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Link: https://lkml.kernel.org/r/20220322185709.141236-2-namhyung@kernel.org
This commit is contained in:
Namhyung Kim
2022-03-22 11:57:08 -07:00
committed by Peter Zijlstra
parent 1ee326196c
commit 16edd9b511
3 changed files with 61 additions and 4 deletions
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1
kernel/locking/lockdep.c
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@@ -60,7 +60,6 @@
#include "lockdep_internals.h"
#define CREATE_TRACE_POINTS
#include <trace/events/lock.h>
#ifdef CONFIG_PROVE_LOCKING