diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2022-03-22 11:57:09 -0700 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2022-04-05 10:24:35 +0200 |
| commit | ee042be16cb455116d0fe99b77c6bc8baf87c8c6 (patch) | |
| tree | d5de58e2f2882f0a433ab90a74d23fbee67aa7be /kernel/locking/percpu-rwsem.c | |
| parent | 16edd9b511a13e7760ed4b92ba4e39bacda5c86f (diff) | |
locking: Apply contention tracepoints in the slow path
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
Diffstat (limited to 'kernel/locking/percpu-rwsem.c')
| -rw-r--r-- | kernel/locking/percpu-rwsem.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/locking/percpu-rwsem.c b/kernel/locking/percpu-rwsem.c index c9fdae94e098..5fe4c5495ba3 100644 --- a/kernel/locking/percpu-rwsem.c +++ b/kernel/locking/percpu-rwsem.c @@ -9,6 +9,7 @@ #include <linux/sched/task.h> #include <linux/sched/debug.h> #include <linux/errno.h> +#include <trace/events/lock.h> int __percpu_init_rwsem(struct percpu_rw_semaphore *sem, const char *name, struct lock_class_key *key) @@ -171,9 +172,11 @@ bool __sched __percpu_down_read(struct percpu_rw_semaphore *sem, bool try) if (try) return false; + trace_contention_begin(sem, LCB_F_PERCPU | LCB_F_READ); preempt_enable(); percpu_rwsem_wait(sem, /* .reader = */ true); preempt_disable(); + trace_contention_end(sem, 0); return true; } @@ -216,6 +219,7 @@ void __sched percpu_down_write(struct percpu_rw_semaphore *sem) { might_sleep(); rwsem_acquire(&sem->dep_map, 0, 0, _RET_IP_); + trace_contention_begin(sem, LCB_F_PERCPU | LCB_F_WRITE); /* Notify readers to take the slow path. */ rcu_sync_enter(&sem->rss); @@ -237,6 +241,7 @@ void __sched percpu_down_write(struct percpu_rw_semaphore *sem) /* Wait for all active readers to complete. */ rcuwait_wait_event(&sem->writer, readers_active_check(sem), TASK_UNINTERRUPTIBLE); + trace_contention_end(sem, 0); } EXPORT_SYMBOL_GPL(percpu_down_write); |