linux-kernel - Re: [RFC PATCH v2 1/5] mm: Identify compound pages sooner in isolate_migratepages

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Message-ID: <660b71b7-7e4f-758d-70c8-d938dded5837@linux.alibaba.com>
Date:   Wed, 19 Aug 2020 15:48:41 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Alexander Duyck <alexander.duyck@...il.com>
Cc:     yang.shi@...ux.alibaba.com, lkp@...el.com, rong.a.chen@...el.com,
        khlebnikov@...dex-team.ru, kirill@...temov.name, hughd@...gle.com,
        linux-kernel@...r.kernel.org, daniel.m.jordan@...cle.com,
        linux-mm@...ck.org, shakeelb@...gle.com, willy@...radead.org,
        hannes@...xchg.org, tj@...nel.org, cgroups@...r.kernel.org,
        akpm@...ux-foundation.org, richard.weiyang@...il.com,
        mgorman@...hsingularity.net, iamjoonsoo.kim@....com
Subject: Re: [RFC PATCH v2 1/5] mm: Identify compound pages sooner in
 isolate_migratepages_block



在 2020/8/19 下午12:27, Alexander Duyck 写道:
> In addition by testing for PageCompound sooner we can avoid having the LRU
> flag cleared and then reset in the exception case. As a result this should
> prevent possible races where another thread might be attempting to pull the
> LRU pages from the list.
> 
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...ux.intel.com>

Reviewed-by: Alex Shi <alex.shi@...ux.alibaba.com>