linux-kernel - Re: [PATCH 0/4] Follow-up "Fix excessive CPU usage during compaction"

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Message-ID: <0318d80c-4a4b-41af-1005-75947ba510d2@linux.alibaba.com>
Date:   Tue, 23 May 2023 21:47:47 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Mel Gorman <mgorman@...hsingularity.net>,
        Vlastimil Babka <vbabka@...e.cz>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Michal Hocko <mhocko@...nel.org>,
        Pedro Falcato <pedro.falcato@...il.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Chuyi Zhou <zhouchuyi@...edance.com>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/4] Follow-up "Fix excessive CPU usage during compaction"

Hi Mel,

On 5/15/2023 7:33 PM, Mel Gorman wrote:
> The series "Fix excessive CPU usage during compaction" [1] attempted to
> fix a bug [2] but Vlastimil noted that the fix was incomplete [3]. While
> the series was merged, fast_find_migrateblock was still disabled. This
> series should fix the corner cases and allow 95e7a450b819 ("Revert
> "mm/compaction: fix set skip in fast_find_migrateblock"") to be safely
> reverted. Details on how many pageblocks are rescanned are in the
> changelog of the last patch.
> 
> [1] https://lore.kernel.org/r/20230125134434.18017-1-mgorman@techsingularity.net
> [2] https://bugzilla.suse.com/show_bug.cgi?id=1206848
> [3] https://lore.kernel.org/r/a55cf026-a2f9-ef01-9a4c-398693e048ea@suse.cz

I've run this series on my machine, which can solve the regression I met 
before [1], and no other issues found. So please feel free to add:
Tested-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

[1] 
https://lore.kernel.org/all/3576e3520c044beb2a81860aecb2d4f597089300.1682521303.git.baolin.wang@linux.alibaba.com/

> 
>   mm/compaction.c | 24 ++++++++++--------------
>   1 file changed, 10 insertions(+), 14 deletions(-)
>