linux-kernel - Re: page allocator bug in 3.16?

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Date:	Fri, 26 Sep 2014 05:40:05 -0500
From:	Chuck Ebbert <cebbert.lkml@...il.com>
To:	Thomas Hellstrom <thellstrom@...are.com>
Cc:	Peter Hurley <peter@...leysoftware.com>,
	Mel Gorman <mgorman@...e.de>, Shaohua Li <shli@...nel.org>,
	Rik van Riel <riel@...hat.com>,
	"Maarten Lankhorst" <maarten.lankhorst@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Ingo Molnar <mingo@...nel.org>,
	Hugh Dickens <hughd@...gle.com>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: Re: page allocator bug in 3.16?

On Fri, 26 Sep 2014 09:15:57 +0200
Thomas Hellstrom <thellstrom@...are.com> wrote:

> On 09/26/2014 01:52 AM, Peter Hurley wrote:
> > On 09/25/2014 03:35 PM, Chuck Ebbert wrote:
> >> There are six ttm patches queued for 3.16.4:
> >>
> >> drm-ttm-choose-a-pool-to-shrink-correctly-in-ttm_dma_pool_shrink_scan.patch
> >> drm-ttm-fix-handling-of-ttm_pl_flag_topdown-v2.patch
> >> drm-ttm-fix-possible-division-by-0-in-ttm_dma_pool_shrink_scan.patch
> >> drm-ttm-fix-possible-stack-overflow-by-recursive-shrinker-calls.patch
> >> drm-ttm-pass-gfp-flags-in-order-to-avoid-deadlock.patch
> >> drm-ttm-use-mutex_trylock-to-avoid-deadlock-inside-shrinker-functions.patch
> > Thanks for info, Chuck.
> >
> > Unfortunately, none of these fix TTM dma allocation doing CMA dma allocation,
> > which is the root problem.
> >
> > Regards,
> > Peter Hurley
> 
> The problem is not really in TTM but in CMA, There was a guy offering to
> fix this in the CMA code but I guess he didn't probably because he
> didn't receive any feedback.
> 

Yeah, the "solution" to this problem seems to be "don't enable CMA on
x86". Maybe it should even be disabled in the config system.
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