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From: Vlastimil Babka <vbabka@suse.cz>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	Mel Gorman <mgorman@techsingularity.net>,
	Michal Hocko <mhocko@kernel.org>,
	David Rientjes <rientjes@google.com>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	stable@vger.kernel.org
Subject: Re: [PATCH] mm, page_alloc: do not break __GFP_THISNODE by zonelist reset
Date: Mon, 28 May 2018 11:55:52 +0200
Message-ID: <26adcbc0-7741-4f39-9fac-fc7f387bdbe6@suse.cz> (raw)
In-Reply-To: <4cd73f77-e6ab-bdd1-69a2-bd0f8413d189@suse.cz>

On 05/25/2018 10:48 PM, Vlastimil Babka wrote:
> On 05/25/2018 09:43 PM, Andrew Morton wrote:
>> On Fri, 25 May 2018 15:08:53 +0200 Vlastimil Babka <vbabka@suse.cz> wrote:
>>
>>> we might consider this for 4.17 although I don't know if there's anything
>>> currently broken. Stable backports should be more important, but will have to
>>> be reviewed carefully, as the code went through many changes.
>>> BTW I think that also the ac->preferred_zoneref reset is currently useless if
>>> we don't also reset ac->nodemask from a mempolicy to NULL first (which we
>>> probably should for the OOM victims etc?), but I would leave that for a
>>> separate patch.
>>
>> Confused.  If nothing is currently broken then why is a backport
>> needed?  Presumably because we expect breakage in the future?  Can you
>> expand on this?
> 
> I mean that SLAB is currently not affected, but in older kernels than
> 4.7 that don't yet have 511e3a058812 ("mm/slab: make cache_grow() handle
> the page allocated on arbitrary node") it is. That's at least 4.4 LTS.
> Older ones I'll have to check.

So I've checked the non-EOL LTS's at kernel.org and:

4.16, 4.14, 4.9 - same as mainline (__GFP_THISNODE broken, but SLAB is OK)
4.4, 4.1, 3.16 - SLAB potentially broken if it makes an
ALLOC_NO_WATERMARKS allocation (our 4.4 kernel has backports that extend
it to also !ALLOC_CPUSET so it's more likely).

  reply index

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-25 13:08 Vlastimil Babka
2018-05-25 19:43 ` Andrew Morton
2018-05-25 20:48   ` Vlastimil Babka
2018-05-28  9:55     ` Vlastimil Babka [this message]
2018-05-28  7:21   ` Michal Hocko
2018-05-28 10:00     ` Vlastimil Babka
2018-05-28  8:49 ` Mel Gorman

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