39 lines
955 B
Diff
39 lines
955 B
Diff
From 921fcd2d82888a9b91a0181ea6ff83f45252cf8d Mon Sep 17 00:00:00 2001
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Tue, 7 Jun 2011 11:25:03 +0200
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Subject: [PATCH 149/271] sched-cond-resched.patch
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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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diff --git a/kernel/sched.c b/kernel/sched.c
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index c5a59b5..8d6ec1a 100644
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--- a/kernel/sched.c
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+++ b/kernel/sched.c
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@@ -5774,9 +5774,17 @@ 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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--
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1.7.10
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