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/rtmutex.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/rtmutex.c')
| -rw-r--r-- | kernel/locking/rtmutex.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/locking/rtmutex.c b/kernel/locking/rtmutex.c index 8555c4efe97c..7779ee8abc2a 100644 --- a/kernel/locking/rtmutex.c +++ b/kernel/locking/rtmutex.c @@ -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) |