diff options
| author | Srikar Dronamraju | 2015-08-11 13:00:12 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2015-09-13 09:52:53 +0200 |
| commit | c3b9bc5bbfc3750570d788afffd431263ef695c6 (patch) | |
| tree | c0c42873cf12ccd803249e0ca4921b93c6d8a5b1 /kernel/sched/core.c | |
| parent | sched/numa: Rename numabalancing_enabled to sched_numa_balancing (diff) | |
| download | kernel-qcow2-linux-c3b9bc5bbfc3750570d788afffd431263ef695c6.tar.gz kernel-qcow2-linux-c3b9bc5bbfc3750570d788afffd431263ef695c6.tar.xz kernel-qcow2-linux-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/core.c')
| -rw-r--r-- | kernel/sched/core.c | 14 |
1 files changed, 5 insertions, 9 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2656af00ea5e..ca665f8bec98 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2115,22 +2115,18 @@ static void __sched_fork(unsigned long clone_flags, struct task_struct *p) } #ifdef CONFIG_NUMA_BALANCING -#ifdef CONFIG_SCHED_DEBUG +__read_mostly bool sched_numa_balancing; + void set_numabalancing_state(bool enabled) { + sched_numa_balancing = enabled; +#ifdef CONFIG_SCHED_DEBUG if (enabled) sched_feat_set("NUMA"); else sched_feat_set("NO_NUMA"); -} -#else -__read_mostly bool sched_numa_balancing; - -void set_numabalancing_state(bool enabled) -{ - sched_numa_balancing = enabled; -} #endif /* CONFIG_SCHED_DEBUG */ +} #ifdef CONFIG_PROC_SYSCTL int sysctl_numa_balancing(struct ctl_table *table, int write, |