linux-kernel - Re: [RFC v2 09/14] mm: Support order-1 folios in the page cache

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Message-ID: <6fc4adcd-c7a3-4ca3-b309-13b484e75d12@suse.de>
Date: Tue, 13 Feb 2024 16:03:07 +0100
From: Hannes Reinecke <hare@...e.de>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>,
 linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc: mcgrof@...nel.org, gost.dev@...sung.com, akpm@...ux-foundation.org,
 kbusch@...nel.org, djwong@...nel.org, chandan.babu@...cle.com,
 p.raghav@...sung.com, linux-kernel@...r.kernel.org, willy@...radead.org,
 linux-mm@...ck.org, david@...morbit.com
Subject: Re: [RFC v2 09/14] mm: Support order-1 folios in the page cache

On 2/13/24 10:37, Pankaj Raghav (Samsung) wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> Folios of order 1 have no space to store the deferred list.  This is
> not a problem for the page cache as file-backed folios are never
> placed on the deferred list.  All we need to do is prevent the core
> MM from touching the deferred list for order 1 folios and remove the
> code which prevented us from allocating order 1 folios.
> 
> Link: https://lore.kernel.org/linux-mm/90344ea7-4eec-47ee-5996-0c22f42d6a6a@google.com/
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>   include/linux/huge_mm.h |  7 +++++--
>   mm/filemap.c            |  2 --
>   mm/huge_memory.c        | 23 ++++++++++++++++++-----
>   mm/internal.h           |  4 +---
>   mm/readahead.c          |  3 ---
>   5 files changed, 24 insertions(+), 15 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes