[PATCH 29/31] sched, numa, mm: Add NUMA_MIGRATION feature flag

[Peter Zijlstra]

From: Ingo Molnar <mingo@xxxxxxxxxx>

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>
---
 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)


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/