linux-kernel - Re: [PATCH v5 1/3] mm/compaction: enable compacting >0 order folios.

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Date: Thu, 15 Feb 2024 16:22:02 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Zi Yan <ziy@...dia.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc: "Huang, Ying" <ying.huang@...el.com>, Ryan Roberts
 <ryan.roberts@....com>, Andrew Morton <akpm@...ux-foundation.org>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 David Hildenbrand <david@...hat.com>, "Yin, Fengwei"
 <fengwei.yin@...el.com>, Yu Zhao <yuzhao@...gle.com>,
 "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
 Johannes Weiner <hannes@...xchg.org>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Kemeng Shi <shikemeng@...weicloud.com>,
 Mel Gorman <mgorman@...hsingularity.net>, Rohan Puri
 <rohan.puri15@...il.com>, Mcgrof Chamberlain <mcgrof@...nel.org>,
 Adam Manzanares <a.manzanares@...sung.com>,
 "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: Re: [PATCH v5 1/3] mm/compaction: enable compacting >0 order folios.

On 2/14/24 23:04, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> migrate_pages() supports >0 order folio migration and during compaction,
> even if compaction_alloc() cannot provide >0 order free pages,
> migrate_pages() can split the source page and try to migrate the base
> pages from the split.  It can be a baseline and start point for adding
> support for compacting >0 order folios.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> Suggested-by: Huang Ying <ying.huang@...el.com>
> Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> Tested-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
> Tested-by: Yu Zhao <yuzhao@...gle.com>

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

> Cc: Adam Manzanares <a.manzanares@...sung.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Johannes Weiner <hannes@...xchg.org>
> Cc: Kemeng Shi <shikemeng@...weicloud.com>
> Cc: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Cc: Luis Chamberlain <mcgrof@...nel.org>
> Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
> Cc: Mel Gorman <mgorman@...hsingularity.net>
> Cc: Ryan Roberts <ryan.roberts@....com>
> Cc: Vishal Moola (Oracle) <vishal.moola@...il.com>
> Cc: Vlastimil Babka <vbabka@...e.cz>
> Cc: Yin Fengwei <fengwei.yin@...el.com>