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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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15
kernel/locking/semaphore.c
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@ -32,6 +32,7 @@
#include <linux/semaphore.h>
#include <linux/spinlock.h>
#include <linux/ftrace.h>
#include <trace/events/lock.h>
static noinline void __down(struct semaphore *sem);
static noinline int __down_interruptible(struct semaphore *sem);
@ -205,7 +206,7 @@ struct semaphore_waiter {
* constant, and thus optimised away by the compiler. Likewise the
* 'timeout' parameter for the cases without timeouts.
*/
static inline int __sched __down_common(struct semaphore *sem, long state,
static inline int __sched ___down_common(struct semaphore *sem, long state,
long timeout)
{
struct semaphore_waiter waiter;
@ -236,6 +237,18 @@ static inline int __sched __down_common(struct semaphore *sem, long state,
return -EINTR;
}
static inline int __sched __down_common(struct semaphore *sem, long state,
long timeout)
{
int ret;
trace_contention_begin(sem, 0);
ret = ___down_common(sem, state, timeout);
trace_contention_end(sem, ret);
return ret;
}
static noinline void __sched __down(struct semaphore *sem)
{
__down_common(sem, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);