linux-kernel - Re: [PATCH 00/49] Automatic NUMA Balancing v10

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Message-ID: <20121210115357.GA8242@gmail.com>
Date:	Mon, 10 Dec 2012 12:53:57 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>, Hillf Danton <dhillf@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Alex Shi <lkml.alex@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/49] Automatic NUMA Balancing v10


* Ingo Molnar <mingo@...nel.org> wrote:

> > reasons. As it turns out, a printk() bodge showed that 
> > nr_cpus_allowed == 80 set in sched_init_smp() while 
> > num_online_cpus() == 48. This effectively disabling 
> > numacore. If you had responded to the bug report, this would 
> > likely have been found last Wednesday.
> 
> Does changing it from num_online_cpus() to num_possible_cpus() 
> help? (Can send a patch if you want.)

I.e. something like the patch below.

Thanks,

	Ingo

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 503ec29..9d11a8a 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2646,7 +2646,7 @@ static bool task_numa_candidate(struct task_struct *p)
 
 	/* Don't disturb hard-bound tasks: */
 	if (sched_feat(NUMA_EXCLUDE_AFFINE)) {
-		if (p->nr_cpus_allowed != num_online_cpus())
+		if (p->nr_cpus_allowed != num_possible_cpus())
 			return false;
 	}
 
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