linux-kernel - Re: [PATCH v1] mm: help the ALLOC_HARDER allocation pass the watermarki when CMA on

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Message-Id: <20180323130408.0c6451fac02c49b535ec7485@linux-foundation.org>
Date:   Fri, 23 Mar 2018 13:04:08 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Zhaoyang Huang <huangzhaoyang@...il.com>,
        zhaoyang.huang@...eadtrum.com, Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Johannes Weiner <hannes@...xchg.org>,
        vel Tatashin <pasha.tatashin@...cle.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        kernel-patch-test@...ts.linaro.org,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v1] mm: help the ALLOC_HARDER allocation pass the
 watermarki when CMA on

On Fri, 23 Mar 2018 10:33:27 +0100 Michal Hocko <mhocko@...nel.org> wrote:

> On Fri 23-03-18 17:19:26, Zhaoyang Huang wrote:
> > On Fri, Mar 23, 2018 at 4:38 PM, Michal Hocko <mhocko@...nel.org> wrote:
> > > On Fri 23-03-18 15:57:32, Zhaoyang Huang wrote:
> > >> For the type of 'ALLOC_HARDER' page allocation, there is an express
> > >> highway for the whole process which lead the allocation reach __rmqueue_xxx
> > >> easier than other type.
> > >> However, when CMA is enabled, the free_page within zone_watermark_ok() will
> > >> be deducted for number the pages in CMA type, which may cause the watermark
> > >> check fail, but there are possible enough HighAtomic or Unmovable and
> > >> Reclaimable pages in the zone. So add 'alloc_harder' here to
> > >> count CMA pages in to clean the obstacles on the way to the final.
> > >
> > > This is no longer the case in the current mmotm tree. Have a look at
> > > Joonsoo's zone movable based CMA patchset http://lkml.kernel.org/r/1512114786-5085-1-git-send-email-iamjoonsoo.kim@lge.com
> > >
> > Thanks for the information. However, I can't find the commit in the
> > latest mainline, is it merged?
> 
> Not yet. It is still sitting in the mmomt tree. I am not sure what is
> the merge plan but I guess it is still waiting for some review feedback.

http://lkml.kernel.org/r/20171222001113.GA1729@js1304-P5Q-DELUXE

That patchset has been floating about since December and still has
unresolved issues.

Joonsoo, can you please let us know the status?

Thanks.