linux-kernel - Re: [PATCH] mm: page_alloc: avoid merging non-fallbackable pageblocks with others.

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Message-ID: <270246c0-7550-4770-f880-01b5440bf977@suse.cz>
Date:   Tue, 25 Jan 2022 16:52:14 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Zi Yan <ziy@...dia.com>, Mel Gorman <mgorman@...hsingularity.net>,
        linux-mm@...ck.org
Cc:     linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] mm: page_alloc: avoid merging non-fallbackable pageblocks
 with others.

On 1/24/22 18:59, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> This is done in addition to MIGRATE_ISOLATE pageblock merge avoidance.
> It prepares for the upcoming removal of the MAX_ORDER-1 alignment
> requirement for CMA and alloc_contig_range().
> 
> MIGRARTE_HIGHATOMIC should not merge with other migratetypes like
> MIGRATE_ISOLATE and MIGRARTE_CMA[1], so this commit prevents that too.
> 
> Remove MIGRARTE_CMA and MIGRATE_ISOLATE from fallbacks list, since they
> are never used.
> 
> [1] https://lore.kernel.org/linux-mm/20211130100853.GP3366@techsingularity.net/
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> Acked-by: Mel Gorman <mgorman@...hsingularity.net>

Acked-by: Vlastimil Babka <vbabka@...e.cz>