linux-kernel - Re: [patch] sched: fix the all pinned logic in load_balance

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Date:	Tue, 17 Jul 2007 10:21:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>
Cc:	nickpiggin@...oo.com.au, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, clameter@....com
Subject: Re: [patch] sched: fix the all pinned logic in
	load_balance_newidle()


* Siddha, Suresh B <suresh.b.siddha@...el.com> wrote:

> nr_moved is not the correct check for triggering all pinned logic. Fix 
> the all pinned logic in the case of load_balance_newidle().

indeeed.

i've applied your patch to my queue. (I've done a trivial style change 
to it, see below.)

	Ingo

--------------------->
Subject: sched: fix the all pinned logic in load_balance_newidle()
From: Suresh Siddha <suresh.b.siddha@...el.com>

nr_moved is not the correct check for triggering all pinned logic. Fix
the all pinned logic in the case of load_balance_newidle().

Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -2679,6 +2679,7 @@ load_balance_newidle(int this_cpu, struc
 	unsigned long imbalance;
 	int nr_moved = 0;
 	int sd_idle = 0;
+	int all_pinned = 0;
 	cpumask_t cpus = CPU_MASK_ALL;
 
 	/*
@@ -2717,10 +2718,11 @@ redo:
 		double_lock_balance(this_rq, busiest);
 		nr_moved = move_tasks(this_rq, this_cpu, busiest,
 					minus_1_or_zero(busiest->nr_running),
-					imbalance, sd, CPU_NEWLY_IDLE, NULL);
+					imbalance, sd, CPU_NEWLY_IDLE,
+					&all_pinned);
 		spin_unlock(&busiest->lock);
 
-		if (!nr_moved) {
+		if (unlikely(all_pinned)) {
 			cpu_clear(cpu_of(busiest), cpus);
 			if (!cpus_empty(cpus))
 				goto redo;
-
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