linux-kernel - Re: [PATCH 04/12] bdi: initialize ->ra_pages and ->io_pages in bdi

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Message-ID: <20200917100459.GK7347@quack2.suse.cz>
Date:   Thu, 17 Sep 2020 12:04:59 +0200
From:   Jan Kara <jack@...e.cz>
To:     Christoph Hellwig <hch@....de>
Cc:     Jens Axboe <axboe@...nel.dk>, Song Liu <song@...nel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Richard Weinberger <richard@....at>,
        Minchan Kim <minchan@...nel.org>,
        linux-mtd@...ts.infradead.org, dm-devel@...hat.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        drbd-dev@...ts.linbit.com, linux-raid@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        cgroups@...r.kernel.org, David Sterba <dsterba@...e.com>
Subject: Re: [PATCH 04/12] bdi: initialize ->ra_pages and ->io_pages in
 bdi_init

On Thu 10-09-20 16:48:24, Christoph Hellwig wrote:
> Set up a readahead size by default, as very few users have a good
> reason to change it.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> Acked-by: David Sterba <dsterba@...e.com> [btrfs]
> Acked-by: Richard Weinberger <richard@....at> [ubifs, mtd]

Looks good but what about coda, ecryptfs, and orangefs? Currenly they have
readahead disabled and this patch would seem to enable it?

> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 8e8b00627bb2d8..2dac3be6127127 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -746,6 +746,8 @@ struct backing_dev_info *bdi_alloc(int node_id)
>  		kfree(bdi);
>  		return NULL;
>  	}
> +	bdi->ra_pages = VM_READAHEAD_PAGES;
> +	bdi->io_pages = VM_READAHEAD_PAGES;

Won't this be more logical in bdi_init() than in bdi_alloc()?

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR