linux-kernel - Re: [RFC PATCH 15/26] mm: compaction: simplify free block check in suitable_migration

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Message-ID: <20230421143929.riofzlnmn2dgqfc7@techsingularity.net>
Date:   Fri, 21 Apr 2023 15:39:29 +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 15/26] mm: compaction: simplify free block check in
 suitable_migration_target()

On Tue, Apr 18, 2023 at 03:13:02PM -0400, Johannes Weiner wrote:
> Free page blocks are now marked MIGRATE_FREE. Consult that directly.
> 
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>

Justification for patch depends on whether MIGRATE_FREE is itself
necessaary. Even then, it's a micro-optimisation but maybe it matters
more later.

-- 
Mel Gorman
SUSE Labs