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| author |   Peter Zijlstra (Intel) <peterz@infradead.org> | 2021-01-18 15:12:20 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2021-02-17 14:12:42 +0100 |
| commit | b965f1ddb47daa5b8b2e2bc9c921431236830367 (patch) | |
| tree | 32cb3a3c160f26523f6d07a9ddadaf25df7c13a3 /kernel/sched/core.c | |
| parent | preempt: Introduce CONFIG_PREEMPT_DYNAMIC (diff) | |
| download | linux-dev-b965f1ddb47daa5b8b2e2bc9c921431236830367.tar.xz linux-dev-b965f1ddb47daa5b8b2e2bc9c921431236830367.zip | |
preempt/dynamic: Provide cond_resched() and might_resched() static calls
Provide static calls to control cond_resched() (called in !CONFIG_PREEMPT)
and might_resched() (called in CONFIG_PREEMPT_VOLUNTARY) to that we
can override their behaviour when preempt= is overriden.
Since the default behaviour is full preemption, both their calls are
ignored when preempt= isn't passed.
[fweisbec: branch might_resched() directly to __cond_resched(), only
define static calls when PREEMPT_DYNAMIC]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20210118141223.123667-6-frederic@kernel.org
Diffstat (limited to '')
| -rw-r--r-- | kernel/sched/core.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 4afbdd27f46d..f7c8fd8fa177 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6785,17 +6785,27 @@ SYSCALL_DEFINE0(sched_yield) return 0; } -#ifndef CONFIG_PREEMPTION -int __sched _cond_resched(void) +#if !defined(CONFIG_PREEMPTION) || defined(CONFIG_PREEMPT_DYNAMIC) +int __sched __cond_resched(void) { if (should_resched(0)) { preempt_schedule_common(); return 1; } +#ifndef CONFIG_PREEMPT_RCU rcu_all_qs(); +#endif return 0; } -EXPORT_SYMBOL(_cond_resched); +EXPORT_SYMBOL(__cond_resched); +#endif + +#ifdef CONFIG_PREEMPT_DYNAMIC +DEFINE_STATIC_CALL_RET0(cond_resched, __cond_resched); +EXPORT_STATIC_CALL(cond_resched); + +DEFINE_STATIC_CALL_RET0(might_resched, __cond_resched); +EXPORT_STATIC_CALL(might_resched); #endif /* |