linux-kernel - Re: [PATCH v6 05/11] mm: split a folio in minimum folio order chunks

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Date: Mon, 3 Jun 2024 08:34:21 +0200
From: Hannes Reinecke <hare@...e.de>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>, david@...morbit.com,
 chandan.babu@...cle.com, akpm@...ux-foundation.org, brauner@...nel.org,
 willy@...radead.org, djwong@...nel.org
Cc: linux-kernel@...r.kernel.org, john.g.garry@...cle.com,
 gost.dev@...sung.com, yang@...amperecomputing.com, p.raghav@...sung.com,
 cl@...amperecomputing.com, linux-xfs@...r.kernel.org, hch@....de,
 mcgrof@...nel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v6 05/11] mm: split a folio in minimum folio order chunks

On 5/29/24 15:45, Pankaj Raghav (Samsung) wrote:
> From: Luis Chamberlain <mcgrof@...nel.org>
> 
> split_folio() and split_folio_to_list() assume order 0, to support
> minorder we must expand these to check the folio mapping order and use
> that.
> 
> Set new_order to be at least minimum folio order if it is set in
> split_huge_page_to_list() so that we can maintain minimum folio order
> requirement in the page cache.
> 
> Update the debugfs write files used for testing to ensure the order
> is respected as well. We simply enforce the min order when a file
> mapping is used.
> 
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> ---
>   include/linux/huge_mm.h | 14 ++++++++----
>   mm/huge_memory.c        | 50 ++++++++++++++++++++++++++++++++++++++---
>   2 files changed, 57 insertions(+), 7 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich