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authorZhu Yanhai <gaoyang.zyh@taobao.com>2013-01-08 12:56:52 +0800
committerIngo Molnar <mingo@kernel.org>2013-01-24 14:41:00 +0100
commita59f4e079d19464eebb9b06513a1d4f55fdae5ba (patch)
tree608a8b463cbc07bd252644ec25f73dfed480a71c /kernel/sched
parentff7532ca2c631e7e96dcd305a967b610259dc0ea (diff)
downloadlinux-a59f4e079d19464eebb9b06513a1d4f55fdae5ba.tar.bz2
sched: Fix the broken sched_rr_get_interval()
The caller of sched_sliced() should pass se.cfs_rq and se as the arguments, however in sched_rr_get_interval() we gave it rq.cfs_rq and se, which made the following computation obviously wrong. The change was introduced by commit: 77034937dc45 sched: fix crash in sys_sched_rr_get_interval() ... 5 years ago, while it had been the correct 'cfs_rq_of' before the commit. The change seems to be irrelevant to the commit msg, which was to return a 0 timeslice for tasks that are on an idle runqueue. So I believe that was just a plain typo. Signed-off-by: Zhu Yanhai <gaoyang.zyh@taobao.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Turner <pjt@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1357621012-15039-1-git-send-email-gaoyang.zyh@taobao.com [ Since this is an ABI and an old bug, we'll test this via a slow upstream route, to hopefully discover any app breakage. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/fair.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 5eea8707234a..a7a19ffc3b7e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6101,7 +6101,7 @@ static unsigned int get_rr_interval_fair(struct rq *rq, struct task_struct *task
* idle runqueue:
*/
if (rq->cfs.load.weight)
- rr_interval = NS_TO_JIFFIES(sched_slice(&rq->cfs, se));
+ rr_interval = NS_TO_JIFFIES(sched_slice(cfs_rq_of(se), se));
return rr_interval;
}