Commit-ID: aef6f4048d7467d2d805c6c9edc6dab37597becb Gitweb: http://git.kernel.org/tip/aef6f4048d7467d2d805c6c9edc6dab37597becb Author: Ingo Molnar <mingo@xxxxxxxxxx> AuthorDate: Sat, 20 Oct 2012 22:20:19 +0200 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Sun, 21 Oct 2012 14:40:41 +0200 sched, numa: Add NUMA_MIGRATION feature flag After this patch, doing: # echo NO_NUMA_MIGRATION > /sys/kernel/debug/sched_features Will turn off the NUMA placement logic/policy - but keeps the working set sampling faults in place. This allows the debugging of the WSS facility, by using it but keeping vanilla, non-NUMA CPU and memory placement policies. Default enabled. Generates on extra code on !CONFIG_SCHED_DEBUG. Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Link: http://lkml.kernel.org/n/tip-xjt7bqjlphxRfjXxasqm4cdv@xxxxxxxxxxxxxx --- kernel/sched/core.c | 3 +++ kernel/sched/features.h | 3 +++ 2 files changed, 6 insertions(+), 0 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index ef24c7b..67221c0 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6002,6 +6002,9 @@ void sched_setnode(struct task_struct *p, int node) int on_rq, running; struct rq *rq; + if (!sched_feat(NUMA_MIGRATION)) + return; + rq = task_rq_lock(p, &flags); on_rq = p->on_rq; running = task_current(rq, p); diff --git a/kernel/sched/features.h b/kernel/sched/features.h index f8a7aeb..1d11f6c 100644 --- a/kernel/sched/features.h +++ b/kernel/sched/features.h @@ -63,7 +63,10 @@ SCHED_FEAT(RT_RUNTIME_SHARE, true) SCHED_FEAT(LB_MIN, false) #ifdef CONFIG_SCHED_NUMA +/* Do the working set probing faults: */ SCHED_FEAT(NUMA, true) +/* Do actual migration/placement based on the working set information: */ +SCHED_FEAT(NUMA_MIGRATION, true) SCHED_FEAT(NUMA_HOT, true) SCHED_FEAT(NUMA_TTWU_BIAS, false) SCHED_FEAT(NUMA_TTWU_TO, false) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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