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    Subject[PATCH] sched/numa: recovered SD_PERFER_SIBLING on CPU domain
    Date
    commit 8e7fbcbc22c(sched: Remove stale power aware scheduling remnants
    and dysfunctional knobs) removed SD_PERFER_SIBLING on CPU domain
    On numa machine, that causes load_balance didn't perfer LCPU in same
    physical CPU package.

    It causes some regression on our numa machines from core2 to NHM and SNB.
    Recover this domain flag can recover the performance drop.

    This recovery doesn't has any bad impact on my all benchmarks specjbb,
    kbuild, fio, hackbench .. etc, on all my machines.
    Since it is a recovery, I assume it also has no bad impact for other
    platforms.

    Signed-off-by: Alex Shi <alex.shi@intel.com>
    ---
    include/linux/topology.h | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/include/linux/topology.h b/include/linux/topology.h
    index e91cd43..fec12d6 100644
    --- a/include/linux/topology.h
    +++ b/include/linux/topology.h
    @@ -164,6 +164,7 @@ int arch_update_cpu_topology(void);
    | 0*SD_SHARE_CPUPOWER \
    | 0*SD_SHARE_PKG_RESOURCES \
    | 0*SD_SERIALIZE \
    + | 1*SD_PREFER_SIBLING \
    , \
    .last_balance = jiffies, \
    .balance_interval = 1, \
    --
    1.7.5.4


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