linux-kernel - Re: [PATCH v6 4/6] mm/page_isolation: remove migratetype from move_freepages_block

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Message-ID: <5baee4e4-d8d1-435f-bdec-6cae2fcc6492@suse.cz>
Date: Fri, 30 May 2025 19:10:19 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Zi Yan <ziy@...dia.com>, David Hildenbrand <david@...hat.com>,
 Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org
Cc: Andrew Morton <akpm@...ux-foundation.org>,
 Oscar Salvador <osalvador@...e.de>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
 Mel Gorman <mgorman@...hsingularity.net>,
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 Brendan Jackman <jackmanb@...gle.com>, Richard Chang
 <richardycc@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 4/6] mm/page_isolation: remove migratetype from
 move_freepages_block_isolate()

On 5/30/25 18:22, Zi Yan wrote:
> Since migratetype is no longer overwritten during pageblock isolation,
> moving a pageblock out of MIGRATE_ISOLATE no longer needs a new
> migratetype.
> 
> Add pageblock_isolate_and_move_free_pages() and
> pageblock_unisolate_and_move_free_pages() to be explicit about the page
> isolation operations. Both share the common code in
> __move_freepages_block_isolate(), which is renamed from
> move_freepages_block_isolate().
> 
> Add toggle_pageblock_isolate() to flip pageblock isolation bit in
> __move_freepages_block_isolate().
> 
> Make set_pageblock_migratetype() only accept non MIGRATE_ISOLATE types,
> so that one should use set_pageblock_isolate() to isolate pageblocks.
> As a result, move pageblock migratetype code out of
> __move_freepages_block().
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>

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