From: Peter Zijlstra <peterz@infradead.org>
To: Rik van Riel <riel@redhat.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>,
mingo@redhat.com, linux-kernel@vger.kernel.org, tkhai@yandex.ru
Subject: Re: [PATCH] sched/fair: Care divide error in update_task_scan_period()
Date: Wed, 8 Oct 2014 18:54:02 +0200 [thread overview]
Message-ID: <20141008165402.GO10832@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <54356970.7050805@redhat.com>
On Wed, Oct 08, 2014 at 12:42:24PM -0400, Rik van Riel wrote:
> On 10/08/2014 02:43 AM, Yasuaki Ishimatsu wrote:
>
> > The divide error is rare case because the trigger is node offline.
> > By this patch, when both of private and shared are set to 0, diff
> > is just set to 0, not calculating the division.
>
> How about a simple
>
> if (private + shared) == 0)
> return;
>
> higher up in the function, to avoid adding an extra
> layer of indentation and confusion to the main part
> of the function?
At which point we'll have 3 different return semantics. Should we not
clear numa_faults_localityp[], even in this case?
next prev parent reply other threads:[~2014-10-08 16:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-08 6:43 [PATCH] sched/fair: Care divide error in update_task_scan_period() Yasuaki Ishimatsu
2014-10-08 8:31 ` Peter Zijlstra
2014-10-08 11:51 ` Wanpeng Li
2014-10-09 5:34 ` Yasuaki Ishimatsu
2014-10-08 16:42 ` Rik van Riel
2014-10-08 16:54 ` Peter Zijlstra [this message]
2014-10-09 5:19 ` Yasuaki Ishimatsu
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