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authorWanpeng Li <wanpeng.li@linux.intel.com>2014-10-31 01:39:32 +0300
committerIngo Molnar <mingo@kernel.org>2014-11-04 09:17:53 +0300
commit804968809c321066cca028d4cbd533a420f964bc (patch)
tree16d858a81fb825da306816a3aec0cc73473229c6 /kernel/sched
parent308a623a40ce168eb234ea82c2bd13ff85a098d9 (diff)
downloadlinux-804968809c321066cca028d4cbd533a420f964bc.tar.xz
sched/deadline: Fix artificial overrun introduced by yield_task_dl()
The yield semantic of deadline class is to reduce remaining runtime to zero, and then update_curr_dl() will stop it. However, comsumed bandwidth is reduced from the budget of yield task again even if it has already been set to zero which leads to artificial overrun. This patch fix it by make sure we don't steal some more time from the task that yielded in update_curr_dl(). Suggested-by: Juri Lelli <juri.lelli@arm.com> Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Kirill Tkhai <ktkhai@parallels.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1414708776-124078-2-git-send-email-wanpeng.li@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/deadline.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 9d483e862e58..c047a94de273 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -628,7 +628,7 @@ static void update_curr_dl(struct rq *rq)
sched_rt_avg_update(rq, delta_exec);
- dl_se->runtime -= delta_exec;
+ dl_se->runtime -= dl_se->dl_yielded ? 0 : delta_exec;
if (dl_runtime_exceeded(rq, dl_se)) {
__dequeue_task_dl(rq, curr, 0);
if (likely(start_dl_timer(dl_se, curr->dl.dl_boosted)))