lkml.org 
[lkml]   [2015]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 3/3] sched: don't scan all-offline ->cpus_allowed twice if !CONFIG_CPUSETS
If CONFIG_CPUSETS=n then "case cpuset" changes the state and runs
the already failed for_each_cpu() loop again for no reason.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
kernel/sched/core.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index e4fa6be..b421e24 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1335,13 +1335,15 @@ static int select_fallback_rq(int cpu, struct task_struct *p)
goto out;
}

+ /* No more Mr. Nice Guy. */
switch (state) {
case cpuset:
- /* No more Mr. Nice Guy. */
- cpuset_cpus_allowed_fallback(p);
- state = possible;
- break;
-
+ if (IS_ENABLED(CONFIG_CPUSETS)) {
+ cpuset_cpus_allowed_fallback(p);
+ state = possible;
+ break;
+ }
+ /* fall-through */
case possible:
do_set_cpus_allowed(p, cpu_possible_mask);
state = fail;
--
1.5.5.1


\
 
 \ /
  Last update: 2015-10-10 21:21    [W:0.737 / U:0.028 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site