linux-kernel - Re: [RFC PATCH 12/26] mm: page_alloc: per-migratetype free counts

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Message-ID: <20230421142841.parju3gmqmpefigq@techsingularity.net>
Date:   Fri, 21 Apr 2023 15:28:41 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Johannes Weiner <hannes@...xchg.org>
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 12/26] mm: page_alloc: per-migratetype free counts

On Tue, Apr 18, 2023 at 03:12:59PM -0400, Johannes Weiner wrote:
> Increase visibility into the defragmentation behavior by tracking and
> reporting per-migratetype free counters.
> 
> Subsequent patches will also use those counters to make more targeted
> reclaim/compaction decisions.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Visibility into fragmentation behaviour is information that is
almost certainly only useful to a developer and even then, there is
/proc/pagetypeinfo. At minimum, move this patch to later in the series
but I'm skeptical about its benefit.

-- 
Mel Gorman
SUSE Labs