linux-kernel - Re: [PATCHv2] mm/page_alloc: Make deferred page init free pages in MAX

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Message-ID: <38b82ca1-29c2-4ce5-b7d6-bf1b7dcc365b@suse.cz>
Date:   Tue, 21 Mar 2023 12:41:05 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...e.de>,
        David Hildenbrand <david@...hat.com>
Cc:     linux-mm@...ck.org, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] mm/page_alloc: Make deferred page init free pages in
 MAX_ORDER blocks

On 3/21/23 01:24, Kirill A. Shutemov wrote:
> Normal page init path frees pages during the boot in MAX_ORDER chunks,
> but deferred page init path does it in pageblock blocks.
> 
> Change deferred page init path to work in MAX_ORDER blocks.
> 
> For cases when MAX_ORDER is larger than pageblock, set migrate type to
> MIGRATE_MOVABLE for all pageblocks covered by the page.

Looks like the problems with migratetype were why commit e780149bcd4b ("mm:
fix set pageblock migratetype in deferred struct page init") switched it
from MAX_ORDER to pageblock_order. This should work better.

> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

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

But I think you'll have to rebase on mm-unstable that moved some of the code
to mm_init.c