Re: [PATCH 4/5] brd: limit maximal block size to 32M

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To: Hannes Reinecke <hare@xxxxxxx>
Subject: Re: [PATCH 4/5] brd: limit maximal block size to 32M
From: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Date: Mon, 6 Mar 2023 17:40:04 +0000
Cc: Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx, Luis Chamberlain <mcgrof@xxxxxxxxxx>, Keith Busch <kbusch@xxxxxxxxxx>
In-reply-to: <20230306120127.21375-5-hare@suse.de>
References: <20230306120127.21375-1-hare@suse.de> <20230306120127.21375-5-hare@suse.de>

On Mon, Mar 06, 2023 at 01:01:26PM +0100, Hannes Reinecke wrote:
> Use an arbitrary limit of 32M for the maximal blocksize so as not
> to overflow the page cache.

The page allocator tops out at MAX_ORDER (generally 4MB), so that might
be a better limit.  Also, this has nothing to do with the page cache,
right?

Follow-Ups:
- Re: [PATCH 4/5] brd: limit maximal block size to 32M
  - From: Hannes Reinecke

References:
- [PATCH 0/5] brd: Allow to change block sizes
  - From: Hannes Reinecke
- [PATCH 4/5] brd: limit maximal block size to 32M
  - From: Hannes Reinecke

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