linux-kernel - RE: [PATCH v2] sched/fair: fix find_idlest

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A01EEA8AF@SHSMSX101.ccr.corp.intel.com>
Date:	Fri, 5 Dec 2014 01:48:25 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Vincent Guittot <vincent.guittot@...aro.org>,
	"Zhang, Jun" <jun.zhang@...el.com>
CC:	"mingo@...hat.com" <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"Liu, Changcheng" <changcheng.liu@...el.com>
Subject: RE: [PATCH v2] sched/fair: fix find_idlest_cpu return -1



> -----Original Message-----
> From: Vincent Guittot [mailto:vincent.guittot@...aro.org]
> Sent: Thursday, December 04, 2014 8:15 PM
> To: Zhang, Jun
> Cc: mingo@...hat.com; Peter Zijlstra; gregkh@...uxfoundation.org; Hillf
> Danton; linux-kernel; stable@...r.kernel.org; Liu, Chuansheng; Liu,
> Changcheng
> Subject: Re: [PATCH v2] sched/fair: fix find_idlest_cpu return -1
> 
> On 4 December 2014 at 12:43,  <jun.zhang@...el.com> wrote:
> > From: zhang jun <jun.zhang@...el.com>
> >
> > in function select_task_rq_fair, when find_idlest_cpu return -1 and sd->child
> == NULL
> > select_task_rq_fair return -1, system panic.
> 
> you forgot to add on which kernel version this patch applies.
> 
> We don't have such issue on 3.18-rc7 as find_idlest_cpu don't return
> -1. We only need a cleanup of the test against -1 for 3.18-rc
> 
Agreed, so Jun can make two patches:
The first one patch is in find_idlest_cpu() to not return -1 and based on stable-branch such as 3.14.x;
The second patch is one cleanup for new_cpu == -1 judgment against the 3.18-rc, since it is no possibility now;

Best Regards
Chuansheng

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