[PATCH 2/5] sched.c: change branch hint

From: Tim Blechmann
Date: Tue Nov 24 2009 - 06:12:25 EST


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@xxxxxxxxxx>
---
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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