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

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Message-ID: <20180323093327.GM23100@dhcp22.suse.cz>
Date:   Fri, 23 Mar 2018 10:33:27 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Zhaoyang Huang <huangzhaoyang@...il.com>
Cc:     zhaoyang.huang@...eadtrum.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        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
Subject: Re: [PATCH v1] mm: help the ALLOC_HARDER allocation pass the
 watermarki when CMA on

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.
-- 
Michal Hocko
SUSE Labs