35 lines
903 B
Diff
35 lines
903 B
Diff
Subject: sched-cond-resched.patch
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 07 Jun 2011 11:25:03 +0200
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/sched.c | 14 +++++++++++---
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1 file changed, 11 insertions(+), 3 deletions(-)
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Index: linux-3.2/kernel/sched.c
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===================================================================
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--- linux-3.2.orig/kernel/sched.c
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+++ linux-3.2/kernel/sched.c
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@@ -5775,9 +5775,17 @@ static inline int should_resched(void)
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static void __cond_resched(void)
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{
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- add_preempt_count(PREEMPT_ACTIVE);
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- __schedule();
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- sub_preempt_count(PREEMPT_ACTIVE);
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+ do {
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+ add_preempt_count(PREEMPT_ACTIVE);
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+ __schedule();
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+ sub_preempt_count(PREEMPT_ACTIVE);
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+ /*
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+ * Check again in case we missed a preemption
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+ * opportunity between schedule and now.
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+ */
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+ barrier();
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+
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+ } while (need_resched());
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}
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int __sched _cond_resched(void)
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