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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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11
kernel/locking/rtmutex.c
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@@ -24,6 +24,8 @@
#include <linux/sched/wake_q.h>
#include <linux/ww_mutex.h>
#include <trace/events/lock.h>
#include "rtmutex_common.h"
#ifndef WW_RT
@@ -1579,6 +1581,8 @@ static int __sched __rt_mutex_slowlock(struct rt_mutex_base *lock,
set_current_state(state);
trace_contention_begin(lock, LCB_F_RT);
ret = task_blocks_on_rt_mutex(lock, waiter, current, ww_ctx, chwalk);
if (likely(!ret))
ret = rt_mutex_slowlock_block(lock, ww_ctx, state, NULL, waiter);
@@ -1601,6 +1605,9 @@ static int __sched __rt_mutex_slowlock(struct rt_mutex_base *lock,
* unconditionally. We might have to fix that up.
*/
fixup_rt_mutex_waiters(lock);
trace_contention_end(lock, ret);
return ret;
}
@@ -1683,6 +1690,8 @@ static void __sched rtlock_slowlock_locked(struct rt_mutex_base *lock)
/* Save current state and set state to TASK_RTLOCK_WAIT */
current_save_and_set_rtlock_wait_state();
trace_contention_begin(lock, LCB_F_RT);
task_blocks_on_rt_mutex(lock, &waiter, current, NULL, RT_MUTEX_MIN_CHAINWALK);
for (;;) {
@@ -1712,6 +1721,8 @@ static void __sched rtlock_slowlock_locked(struct rt_mutex_base *lock)
*/
fixup_rt_mutex_waiters(lock);
debug_rt_mutex_free_waiter(&waiter);
trace_contention_end(lock, 0);
}
static __always_inline void __sched rtlock_slowlock(struct rt_mutex_base *lock)