linux-kernel - Re: [PATCH v7 03/11] filemap: allocate mapping_min

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Date: Wed, 12 Jun 2024 11:01:44 +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 03/11] filemap: allocate mapping_min_order folios in
 the page cache

On 6/7/24 16:58, Pankaj Raghav (Samsung) wrote:
> From: Pankaj Raghav <p.raghav@...sung.com>
> 
> filemap_create_folio() and do_read_cache_folio() were always allocating
> folio of order 0. __filemap_get_folio was trying to allocate higher
> order folios when fgp_flags had higher order hint set but it will default
> to order 0 folio if higher order memory allocation fails.
> 
> Supporting mapping_min_order implies that we guarantee each folio in the
> page cache has at least an order of mapping_min_order. When adding new
> folios to the page cache we must also ensure the index used is aligned to
> the mapping_min_order as the page cache requires the index to be aligned
> to the order of the folio.
> 
> Co-developed-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Luis Chamberlain <mcgrof@...nel.org>
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> ---
>   include/linux/pagemap.h | 20 ++++++++++++++++++++
>   mm/filemap.c            | 26 ++++++++++++++++++--------
>   2 files changed, 38 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