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Date:   Wed, 12 Aug 2020 20:16:06 +0800
From:   Alex Shi <>
To:     Alexander Duyck <>
Cc:     Andrew Morton <>,
        Mel Gorman <>,
        Tejun Heo <>, Hugh Dickins <>,
        Konstantin Khlebnikov <>,
        Daniel Jordan <>,
        Yang Shi <>,
        Matthew Wilcox <>,
        Johannes Weiner <>,
        kbuild test robot <>,
        linux-mm <>,
        LKML <>,,
        Shakeel Butt <>,
        Joonsoo Kim <>,
        Wei Yang <>,
        "Kirill A. Shutemov" <>,
        Rong Chen <>
Subject: Re: [PATCH v17 14/21] mm/compaction: do page isolation first in

在 2020/8/12 下午7:43, Alex Shi 写道:
>>> Sorry, I still can not follow you here. Compound code part is unchanged
>>> and follow the original logical. So would you like to pose a new code to
>>> see if its works?
>> No there are significant changes as you reordered all of the
>> operations. Prior to your change the LRU bit was checked, but not
>> cleared before testing for PageCompound. Now you are clearing it
>> before you are testing if it is a compound page. So if compaction is
>> running we will be seeing the pages in the LRU stay put, but the
>> compound bit flickering off and on if the compound page is encountered
>> with the wrong or NULL lruvec. What I was suggesting is that the

> The lruvec could be wrong or NULL here, that is the base stone of whole
> patchset.
Sorry for typo. s/could/could not/

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