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    Subject[patch 39/57] sched: disable the hrtick for now

    2.6.27-stable review patch. If anyone has any objections, please let us know.

    ------------------
    From: Ingo Molnar <mingo@elte.hu>

    commit 0c4b83da58ec2e96ce9c44c211d6eac5f9dae478 upstream

    sched: disable the hrtick for now

    David Miller reported that hrtick update overhead has tripled the
    wakeup overhead on Sparc64.

    That is too much - disable the HRTICK feature for now by default,
    until a faster implementation is found.

    Reported-by: David Miller <davem@davemloft.net>
    Acked-by: Peter Zijlstra <peterz@infradead.org>
    Signed-off-by: Ingo Molnar <mingo@elte.hu>
    Cc: Chuck Ebbert <cebbert@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    kernel/sched_features.h | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    --- a/kernel/sched_features.h
    +++ b/kernel/sched_features.h
    @@ -5,7 +5,7 @@ SCHED_FEAT(START_DEBIT, 1)
    SCHED_FEAT(AFFINE_WAKEUPS, 1)
    SCHED_FEAT(CACHE_HOT_BUDDY, 1)
    SCHED_FEAT(SYNC_WAKEUPS, 1)
    -SCHED_FEAT(HRTICK, 1)
    +SCHED_FEAT(HRTICK, 0)
    SCHED_FEAT(DOUBLE_TICK, 0)
    SCHED_FEAT(ASYM_GRAN, 1)
    SCHED_FEAT(LB_BIAS, 1)
    --


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