lkml.org 
[lkml]   [2014]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V2 8/8] sched: factor out on_null_domain check in trigger_load_balance function
Date
The test on_null_domain is done twice in the trigger_load_balance function.

Move the test at the begin of the function, so there is only one check.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
---
kernel/sched/fair.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 59c57e7..ef95ddf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6871,11 +6871,13 @@ static inline int on_null_domain(struct rq *rq)
void trigger_load_balance(struct rq *rq)
{
/* Don't need to rebalance while attached to NULL domain */
- if (time_after_eq(jiffies, rq->next_balance) &&
- likely(!on_null_domain(rq)))
+ if (unlikely(on_null_domain(rq)))
+ return;
+
+ if (time_after_eq(jiffies, rq->next_balance))
raise_softirq(SCHED_SOFTIRQ);
#ifdef CONFIG_NO_HZ_COMMON
- if (nohz_kick_needed(rq) && likely(!on_null_domain(rq)))
+ if (nohz_kick_needed(rq))
nohz_balancer_kick();
#endif
}
--
1.7.9.5


\
 
 \ /
  Last update: 2014-01-06 13:01    [W:0.267 / U:0.724 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site