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| author | Thomas Gleixner <tglx@linutronix.de> | 2021-09-28 14:24:32 +0200 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-10-05 15:52:09 +0200 |
| commit | 8d491de6edc27138806cae6e8eca455beb325b62 (patch) | |
| tree | 63a9b2be7c7f2baacc8dfd695088634fd1c8d079 /kernel | |
| parent | d07b2eee4501c393cbf5bfcad36143310cfd72f9 (diff) | |
| download | linux-8d491de6edc27138806cae6e8eca455beb325b62.tar.gz | |
sched: Move mmdrop to RCU on RT
mmdrop() is invoked from finish_task_switch() by the incoming task to drop the mm which was handed over by the previous task. mmdrop() can be quite expensive which prevents an incoming real-time task from getting useful work done. Provide mmdrop_sched() which maps to mmdrop() on !RT kernels. On RT kernels it delagates the eventually required invocation of __mmdrop() to RCU. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210928122411.648582026@linutronix.de
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 95f4e16f98a2..9eaeba671001 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4836,7 +4836,7 @@ static struct rq *finish_task_switch(struct task_struct *prev) */ if (mm) { membarrier_mm_sync_core_before_usermode(mm); - mmdrop(mm); + mmdrop_sched(mm); } if (unlikely(prev_state == TASK_DEAD)) { if (prev->sched_class->task_dead) |