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

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Date:   Sun, 21 May 2023 20:20:46 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Raghavendra K T <raghavendra.kt@....com>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        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"

On Fri, May 19, 2023 at 12:13:11PM +0530, Raghavendra K T wrote:
> On 5/15/2023 5:03 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
> > 
> >   mm/compaction.c | 24 ++++++++++--------------
> >   1 file changed, 10 insertions(+), 14 deletions(-)
> > 
> 
> Hello Mel,
> 
> Not sure how much this info would help, (also I saw it is in Andrew's
> tree already) But was curious to evaluate the  patchset from perf
> perspective, and I have run mmtest usemem so here is the result (Only
> for  compact cases).
> 
> <SNIP>
>

Thanks Raghavendra!

-- 
Mel Gorman
SUSE Labs