linux-kernel - Re: [PATCH v7 05/11] mm: split a folio in minimum folio order chunks

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Date: Wed, 12 Jun 2024 11:02:19 +0200
From: Hannes Reinecke <hare@...e.de>
To: "Pankaj Raghav (Samsung)" <kernel@...kajraghav.com>, david@...morbit.com,
 djwong@...nel.org, chandan.babu@...cle.com, brauner@...nel.org,
 akpm@...ux-foundation.org, willy@...radead.org
Cc: mcgrof@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
 yang@...amperecomputing.com, Zi Yan <zi.yan@...t.com>,
 linux-xfs@...r.kernel.org, p.raghav@...sung.com,
 linux-fsdevel@...r.kernel.org, hch@....de, gost.dev@...sung.com,
 cl@...amperecomputing.com, john.g.garry@...cle.com
Subject: Re: [PATCH v7 05/11] mm: split a folio in minimum folio order chunks

On 6/7/24 16:58, Pankaj Raghav (Samsung) wrote:
> From: Luis Chamberlain <mcgrof@...nel.org>
> 
> split_folio() and split_folio_to_list() assume order 0, to support
> minorder for non-anonymous folios, 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        | 55 ++++++++++++++++++++++++++++++++++++++---
>   2 files changed, 61 insertions(+), 8 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