Messages in this thread Patch in this message | | | Date | Tue, 24 Nov 2009 11:55:27 +0100 | From | Tim Blechmann <> | Subject | [PATCH 2/5] sched.c: change branch hint |
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branch hint profiling of my nehalem machine, showed over 90% incorrect branch hints:
10420275 170645395 94 context_switch sched.c 3043 10408421 171098521 94 context_switch sched.c 3050
Signed-off-by: Tim Blechmann <tim@klingt.org> --- kernel/sched.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/kernel/sched.c b/kernel/sched.c index c78dcfe..2a78b38 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3040,14 +3040,14 @@ context_switch(struct rq *rq, struct task_struct *prev, */ arch_start_context_switch(prev); - if (unlikely(!mm)) { + if (likely(!mm)) { next->active_mm = oldmm; atomic_inc(&oldmm->mm_count); enter_lazy_tlb(oldmm, next); } else switch_mm(oldmm, mm, next); - if (unlikely(!prev->mm)) { + if (likely(!prev->mm)) { prev->active_mm = NULL; rq->prev_mm = oldmm; } -- 1.6.4.2
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