linux-kernel - [tip:numa/core] sched, numa: Add NUMA

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Message-ID: <tip-496a3089b908c8c0beea77df9e753d24b1fa2237@git.kernel.org>
Date:	Tue, 23 Oct 2012 03:59:21 -0700
From:	tip-bot for Ingo Molnar <mingo@...nel.org>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	a.p.zijlstra@...llo.nl, torvalds@...ux-foundation.org,
	riel@...hat.com, akpm@...ux-foundation.org, aarcange@...hat.com,
	tglx@...utronix.de
Subject: [tip:numa/core] sched, numa: Add NUMA_MIGRATION feature flag

Commit-ID:  496a3089b908c8c0beea77df9e753d24b1fa2237
Gitweb:     http://git.kernel.org/tip/496a3089b908c8c0beea77df9e753d24b1fa2237
Author:     Ingo Molnar <mingo@...nel.org>
AuthorDate: Sat, 20 Oct 2012 22:20:19 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 23 Oct 2012 11:53:46 +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@...nel.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Rik van Riel <riel@...hat.com>
Link: http://lkml.kernel.org/n/tip-xjt7bqjlphxRfjXxasqm4cdv@git.kernel.org
---
 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)
--
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