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authorRik van Riel <riel@redhat.com>2014-05-16 00:13:32 -0400
committerIngo Molnar <mingo@kernel.org>2014-05-22 11:16:41 +0200
commit096aa33863a5e48de52d2ff30e0801b7487944f4 (patch)
treeb226a5aabe9ba4f71f192c58a2ee549ddb499871 /arch/alpha
parentb1ad065e65f56103db8b97edbd218a271ff5b1bb (diff)
downloadlinux-stericsson-096aa33863a5e48de52d2ff30e0801b7487944f4.tar.gz
sched/numa: Decay ->wakee_flips instead of zeroing
Affine wakeups have the potential to interfere with NUMA placement. If a task wakes up too many other tasks, affine wakeups will get disabled. However, regardless of how many other tasks it wakes up, it gets re-enabled once a second, potentially interfering with NUMA placement of other tasks. By decaying wakee_wakes in half instead of zeroing it, we can avoid that problem for some workloads. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: chegu_vinod@hp.com Cc: umgwanakikbuti@gmail.com Link: http://lkml.kernel.org/r/20140516001332.67f91af2@annuminas.surriel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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