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| author |   Srikar Dronamraju <srikar@linux.vnet.ibm.com> | 2015-08-11 16:30:12 +0530 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-09-13 09:52:53 +0200 |
| commit | c3b9bc5bbfc3750570d788afffd431263ef695c6 (patch) | |
| tree | c0c42873cf12ccd803249e0ca4921b93c6d8a5b1 /kernel/sched/fair.c | |
| parent | sched/numa: Rename numabalancing_enabled to sched_numa_balancing (diff) | |
| download | linux-dev-c3b9bc5bbfc3750570d788afffd431263ef695c6.tar.xz linux-dev-c3b9bc5bbfc3750570d788afffd431263ef695c6.zip | |
sched/numa: Disable sched_numa_balancing on UMA systems
Commit 2a1ed24 ("sched/numa: Prefer NUMA hotness over cache hotness")
sets sched feature NUMA to true. However this can enable NUMA hinting
faults on a UMA system.
This commit ensures that NUMA hinting faults occur only on a NUMA system
by setting/resetting sched_numa_balancing.
This commit:
- Makes sched_numa_balancing common to CONFIG_SCHED_DEBUG and
!CONFIG_SCHED_DEBUG. Earlier it was only in !CONFIG_SCHED_DEBUG.
- Checks for sched_numa_balancing instead of sched_feat(NUMA).
Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1439290813-6683-3-git-send-email-srikar@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched/fair.c')
| -rw-r--r-- | kernel/sched/fair.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3a6ac5598bff..e8f0828f4137 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5562,10 +5562,10 @@ static int migrate_degrades_locality(struct task_struct *p, struct lb_env *env) unsigned long src_faults, dst_faults; int src_nid, dst_nid; - if (!p->numa_faults || !(env->sd->flags & SD_NUMA)) + if (!sched_numa_balancing) return -1; - if (!sched_feat(NUMA)) + if (!p->numa_faults || !(env->sd->flags & SD_NUMA)) return -1; src_nid = cpu_to_node(env->src_cpu); |