linux-kernel - Re: [PATCH V2] staging: android: lowmemorykiller: imporve lmk to avoid deadlock issue

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Message-ID: <20150803061556.GS5096@mwanda>
Date:	Mon, 3 Aug 2015 09:15:56 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	"Wang, Biao" <biao.wang@...el.com>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"arve@...roid.com" <arve@...roid.com>,
	"riandrews@...roid.com" <riandrews@...roid.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Zhang, Di" <di.zhang@...el.com>, "Li, Fei" <fei.li@...el.com>,
	"joe@...ches.com" <joe@...ches.com>
Subject: Re: [PATCH V2]  staging: android: lowmemorykiller: imporve lmk to
 avoid deadlock issue

On Mon, Aug 03, 2015 at 05:53:22AM +0000, Wang, Biao wrote:
> Consider the following case:
> Task A trigger lmk with a lock held, while task B try to
> get this lock, but unfortunately B is the very culprit task lmk select to
> kill. Then B will never be killed, and A will forever select B to kill.
> Such dead lock will trigger softlock up issue.
> 
> This patch try to pick the next task to break this loop.
> 
> Signed-off-by: Wang Biao <biao.wang@...el.com>
> Reviewed-by: Zhang Di <di.zhang@...el.com>
> Reviewed-by: Dan Carpenter <dan.carpenter@...cle.com>

I don't really feel comfortable saying I reviewed this code.  I just
commented on a few process issues.  I don't know the subsystem well
enough to give it a seal of approval.

> Reviewed-by: Joe Perches <joe@...ches.com>

regards,
dan carpenter

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