linux-kernel - Re: CMA and zone watermarks

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Message-ID: <20121009050748.GH13817@bbox>
Date:	Tue, 9 Oct 2012 14:07:48 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Marek Szyprowski <m.szyprowski@...sung.com>
Cc:	Rabin Vincent <rabin@....in>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: CMA and zone watermarks

On Tue, Oct 09, 2012 at 06:53:29AM +0200, Marek Szyprowski wrote:
> Hello,
> 
> On 10/9/2012 6:43 AM, Minchan Kim wrote:
> >On Tue, Oct 09, 2012 at 05:12:21AM +0200, Marek Szyprowski wrote:
> >>On 10/9/2012 5:10 AM, Minchan Kim wrote:
> >>>On Mon, Oct 08, 2012 at 05:41:14PM +0200, Rabin Vincent wrote:
> 
> >>>Fortunately, recently, Bart sent a patch about that.
> >>>http://marc.info/?l=linux-mm&m=134763299016693&w=2
> >>>
> >>>Could you test above patches in your kernel?
> >>>You have to apply [2/4], [3/4], [4/4] and don't need [1/4].
> >>
> >>AFAIR without patch [1/4], free cma page counter will go below zero
> >>and weird thing will happen, so better apply the complete patchset.
> >
> >I can't understand your point. [1/4] is just fix for correcting trace
> >No?
> 
> I just remember we ran into such strange negative number of free cma
> pages issue without that patch, but maybe the final patchset will
> simply fail to apply without the first patch.

I have no objection to apply them all, of course.
But note that if you suffer from such strange bug without [1/4],
it should be dug in without buring into just "fixing of the trace"
comment. As I saw the code without [1/4], I can't find any fault.
Could you elaborat it more if you have any guessing in mind?

> 
> Best regards
> -- 
> Marek Szyprowski
> Samsung Poland R&D Center
> 
> --
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-- 
Kind regards,
Minchan Kim
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