linux-kernel - Re: [PATCH] mm/compaction: avoid VM_BUG_ON(PageSlab()) in page

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Message-ID: <7a02e2f6-6fa8-3727-1718-887c0d1dc1cb@linux.alibaba.com>
Date:   Tue, 2 Jun 2020 19:28:30 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Johannes Weiner <hannes@...xchg.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm/compaction: avoid VM_BUG_ON(PageSlab()) in
 page_mapcount()



在 2020/6/2 下午12:05, Hugh Dickins 写道:
> Cc'ing Alex Shi, because I noticed this when trying his v11 per-memcg
> lru_lock series (which appears to be a big improvement over earlier
> versions, thanks in particular to Johannes's memcg swap simplifications);
> and Alex's 12/16 makes a change on top of Konstantin's latter check,
> which will now just be reverted. I'm not yet confident in Alex's
> isolate_migratepages_block(), in part because this muddle.

Hi Hugh,

Yes, this could make a very tricky change on compaction behavior. I will update
the patchset after next update.

Thanks a lot for notice this! And looking forward to more comments on per memcg
lru_lock patchset! :)

Thanks
Alex