linux-kernel - Re: [PATCH for v5.9] mm/page_alloc: handle a missing case for memalloc_nocma

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Message-ID: <CAAmzW4PSwCZuZh=Nm_QJdOchCg5GBixU4sn7YYOzcbnLuG+J+w@mail.gmail.com>
Date:   Fri, 25 Sep 2020 17:58:25 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     Mel Gorman <mgorman@...hsingularity.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...nel.org>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        kernel-team@....com, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH for v5.9] mm/page_alloc: handle a missing case for
 memalloc_nocma_{save/restore} APIs

2020년 9월 25일 (금) 오후 5:55, Vlastimil Babka <vbabka@...e.cz>님이 작성:
>
> On 9/25/20 6:59 AM, Joonsoo Kim wrote:
> > 2020년 8월 28일 (금) 오전 8:54, Joonsoo Kim <js1304@...il.com>님이 작성:
> >
> > Hello, Andrew and Vlastimil.
> >
> > It's better to fix this possible bug introduced in v5.9-rc1 before
> > v5.9 is released.
> > Which approach do you prefer?
> > If it is determined, I will immediately send a patch as you suggested.
>
> Hmm both Mel and I preferred the bypass approach and nobody else weighted in, so
> if you don't mind, you can use my suggestion. Hmm maybe alloc_flags & ALLOC_CMA
> check should precede migratetype check in the if () to optimize for userspace
> allocations?

Okay!
I will implement a bypass approach and send it early next week.

Thanks.