[Bug 102334] [BXT]15% performance drop in SynMark v7.0 Multithread use-case

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=102334

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
First bisection gives:

commit 3fed382b46baac83703130fe4cd3d9147f427fb9
Author: Rik van Riel <riel at redhat.com>
Date:   Fri Jun 23 12:55:29 2017 -0400

    sched/numa: Implement NUMA node level wake_affine()

    Since select_idle_sibling() can place a task anywhere on a socket,
    comparing loads between individual CPU cores makes no real sense
    for deciding whether to do an affine wakeup across sockets, either.

    Instead, compare the load between the sockets in a similar way the
    load balancer and the numa balancing code do.

    Signed-off-by: Rik van Riel <riel at redhat.com>
    Cc: Linus Torvalds <torvalds at linux-foundation.org>
    Cc: Mel Gorman <mgorman at suse.de>
    Cc: Mike Galbraith <efault at gmx.de>
    Cc: Peter Zijlstra <peterz at infradead.org>
    Cc: Thomas Gleixner <tglx at linutronix.de>
    Cc: jhladky at redhat.com
    Cc: linux-kernel at vger.kernel.org
    Link: http://lkml.kernel.org/r/20170623165530.22514-4-riel@redhat.com
    Signed-off-by: Ingo Molnar <mingo at kernel.org>

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