preempt/dynamic: Provide cond_resched() and might_resched() static calls

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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

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Peter Zijlstra (Intel) 2021-01-18 15:12:20 +01:00 • committed by Ingo Molnar

parent 6ef869e064

commit b965f1ddb4

3 changed files with 56 additions and 10 deletions

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23

include/linux/kernel.h

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27

include/linux/sched.h

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16

kernel/sched/core.c

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