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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2016-06-16 15:57:01 +0300
committerIngo Molnar <mingo@kernel.org>2016-06-24 08:26:44 +0200
commit094f469172e00d6ab0a3130b0e01c83b3cf3a98d (patch)
treea46b2d8e6e72d37af00388d20bdfb900f895f2c0 /README
parent8974189222159154c55f24ddad33e3613960521a (diff)
downloadlinux-094f469172e00d6ab0a3130b0e01c83b3cf3a98d.tar.gz
sched/fair: Initialize throttle_count for new task-groups lazily
Cgroup created inside throttled group must inherit current throttle_count. Broken throttle_count allows to nominate throttled entries as a next buddy, later this leads to null pointer dereference in pick_next_task_fair(). This patch initialize cfs_rq->throttle_count at first enqueue: laziness allows to skip locking all rq at group creation. Lazy approach also allows to skip full sub-tree scan at throttling hierarchy (not in this patch). Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: bsegall@google.com Link: http://lkml.kernel.org/r/146608182119.21870.8439834428248129633.stgit@buzz Signed-off-by: Ingo Molnar <mingo@kernel.org>
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