linux-kernel - Re: [RFC PATCH 14/26] mm: compaction: simplify should_compact

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Message-ID: <20230425021558.GB5666@cmpxchg.org>
Date:   Mon, 24 Apr 2023 22:15:58 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     linux-mm@...ck.org, Kaiyang Zhao <kaiyang2@...cmu.edu>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [RFC PATCH 14/26] mm: compaction: simplify should_compact_retry()

On Fri, Apr 21, 2023 at 03:36:54PM +0100, Mel Gorman wrote:
> On Tue, Apr 18, 2023 at 03:13:01PM -0400, Johannes Weiner wrote:
> > The different branches for retry are unnecessarily complicated. There
> > is really only three outcomes: progress, skipped, failed. Also, the
> > retry counter only applies to loops that made progress, move it there.
> > 
> > Signed-off-by: Johannes Weiner <hannes@...xchg.org>
> > ---
> >  mm/page_alloc.c | 60 +++++++++++++++++--------------------------------
> >  1 file changed, 20 insertions(+), 40 deletions(-)
> > 
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index c3b7dc479936..18fa2bbba44b 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -4608,7 +4608,6 @@ should_compact_retry(struct alloc_context *ac, int order, int alloc_flags,
> >  		     enum compact_priority *compact_priority,
> >  		     int *compaction_retries)
> >  {
> > -	int max_retries = MAX_COMPACT_RETRIES;
> >  	int min_priority;
> >  	bool ret = false;
> >  	int retries = *compaction_retries;
> 
> Think this breaks build because of trace_compact_retry and max_retries is
> declared in a different scope on the next hunk.

Right you are. Will fix. Thanks!