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    Subject[PATCH 4.9 021/141] sched/fair: Fix the min_vruntime update logic in dequeue_entity()
    Date
    4.9-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Song Muchun <smuchun@gmail.com>

    [ Upstream commit 9845c49cc9bbb317a0bc9e9cf78d8e09d54c9af0 ]

    The comment and the code around the update_min_vruntime() call in
    dequeue_entity() are not in agreement.

    >From commit:

    b60205c7c558 ("sched/fair: Fix min_vruntime tracking")

    I think that we want to update min_vruntime when a task is sleeping/migrating.
    So, the check is inverted there - fix it.

    Signed-off-by: Song Muchun <smuchun@gmail.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Mike Galbraith <efault@gmx.de>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Fixes: b60205c7c558 ("sched/fair: Fix min_vruntime tracking")
    Link: http://lkml.kernel.org/r/20181014112612.2614-1-smuchun@gmail.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    kernel/sched/fair.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -3502,7 +3502,7 @@ dequeue_entity(struct cfs_rq *cfs_rq, st
    * put back on, and if we advance min_vruntime, we'll be placed back
    * further than we started -- ie. we'll be penalized.
    */
    - if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) == DEQUEUE_SAVE)
    + if ((flags & (DEQUEUE_SAVE | DEQUEUE_MOVE)) != DEQUEUE_SAVE)
    update_min_vruntime(cfs_rq);
    }


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