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locking: Apply contention tracepoints in the slow path

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Adding the lock contention tracepoints in various lock function slow
paths.  Note that each arch can define spinlock differently, I only
added it only to the generic qspinlock for now.

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/20220322185709.141236-3-namhyung@kernel.org
This commit is contained in:
Namhyung Kim
2022-03-22 11:57:09 -07:00
committed by Peter Zijlstra
parent 16edd9b511
commit ee042be16c
8 changed files with 63 additions and 1 deletions
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3
kernel/locking/mutex.c
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@ -644,6 +644,7 @@ __mutex_lock_common(struct mutex *lock, unsigned int state, unsigned int subclas
}
set_current_state(state);
trace_contention_begin(lock, 0);
for (;;) {
bool first;
@ -710,6 +711,7 @@ acquired:
skip_wait:
/* got the lock - cleanup and rejoice! */
lock_acquired(&lock->dep_map, ip);
trace_contention_end(lock, 0);
if (ww_ctx)
ww_mutex_lock_acquired(ww, ww_ctx);
@ -721,6 +723,7 @@ skip_wait:
err:
__set_current_state(TASK_RUNNING);
__mutex_remove_waiter(lock, &waiter);
trace_contention_end(lock, ret);
err_early_kill:
raw_spin_unlock(&lock->wait_lock);
debug_mutex_free_waiter(&waiter);