linux-kernel - Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi

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Message-ID: <CAFLxGvyxtYnJ5UdD18uNA97zQaDB8-Wv8MHQn2g9GYD74v7cTg@mail.gmail.com>
Date:   Mon, 20 Jul 2020 23:27:57 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Artem Bityutskiy <dedekind1@...il.com>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        linux-raid@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Richard Weinberger <richard@....at>,
        LKML <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
        Song Liu <song@...nel.org>,
        device-mapper development <dm-devel@...hat.com>,
        linux-mtd@...ts.infradead.org, linux-mm@...ck.org,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        cgroups mailinglist <cgroups@...r.kernel.org>,
        drbd-dev@...ts.linbit.com
Subject: Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init

On Mon, Jul 20, 2020 at 2:37 PM Artem Bityutskiy <dedekind1@...il.com> wrote:
>
> On Mon, 2020-07-20 at 14:07 +0200, Christoph Hellwig wrote:
> > What about jffs2 and blk2mtd raw block devices?

I don't worry much about blk2mtd.

> If my memory serves me correctly JFFS2 did not mind readahead.

This covers my knowledge too.
I fear enabling readahead on JFFS2 will cause performance issues, this
filesystem
is mostly used on small and slow NOR devices.

-- 
Thanks,
//richard