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Subject[PATCH 29/31] sched, numa, mm: Add NUMA_MIGRATION feature flag
From: Ingo Molnar <mingo@kernel.org>

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@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
---
kernel/sched/core.c | 3 +++
kernel/sched/features.h | 3 +++
2 files changed, 6 insertions(+)

Index: tip/kernel/sched/core.c
===================================================================
--- tip.orig/kernel/sched/core.c
+++ tip/kernel/sched/core.c
@@ -6002,6 +6002,9 @@ void sched_setnode(struct task_struct *p
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);
Index: tip/kernel/sched/features.h
===================================================================
--- tip.orig/kernel/sched/features.h
+++ tip/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)



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