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| author | Rik van Riel <riel@redhat.com> | 2014-05-16 00:13:32 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-05-22 11:16:41 +0200 |
| commit | 096aa33863a5e48de52d2ff30e0801b7487944f4 (patch) | |
| tree | b226a5aabe9ba4f71f192c58a2ee549ddb499871 /kernel | |
| parent | b1ad065e65f56103db8b97edbd218a271ff5b1bb (diff) | |
| download | linux-096aa33863a5e48de52d2ff30e0801b7487944f4.tar.gz linux-096aa33863a5e48de52d2ff30e0801b7487944f4.tar.bz2 linux-096aa33863a5e48de52d2ff30e0801b7487944f4.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/fair.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 503f750c2d25..c9617b73bcc0 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4065,7 +4065,7 @@ static void record_wakee(struct task_struct *p) * about the loss. */ if (jiffies > current->wakee_flip_decay_ts + HZ) { - current->wakee_flips = 0; + current->wakee_flips >>= 1; current->wakee_flip_decay_ts = jiffies; } |