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From: Richard Weinberger <richard.weinberger@gmail.com>
To: Artem Bityutskiy <dedekind1@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
	linux-raid@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
	Richard Weinberger <richard@nod.at>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-block@vger.kernel.org, Song Liu <song@kernel.org>,
	device-mapper development <dm-devel@redhat.com>,
	linux-mtd@lists.infradead.org, linux-mm@kvack.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	cgroups mailinglist <cgroups@vger.kernel.org>,
	drbd-dev@lists.linbit.com
Subject: Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init
Date: Mon, 20 Jul 2020 23:27:57 +0200	[thread overview]
Message-ID: <CAFLxGvyxtYnJ5UdD18uNA97zQaDB8-Wv8MHQn2g9GYD74v7cTg@mail.gmail.com> (raw)
In-Reply-To: <2827a5dbd94bc5c2c1706a6074d9a9a32a590feb.camel@gmail.com>

On Mon, Jul 20, 2020 at 2:37 PM Artem Bityutskiy <dedekind1@gmail.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

WARNING: multiple messages have this Message-ID (diff)
From: Richard Weinberger <richard.weinberger@gmail.com>
To: Artem Bityutskiy <dedekind1@gmail.com>
Cc: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, Song Liu <song@kernel.org>,
	Richard Weinberger <richard@nod.at>,
	LKML <linux-kernel@vger.kernel.org>,
	linux-raid@vger.kernel.org, Hans de Goede <hdegoede@redhat.com>,
	device-mapper development <dm-devel@redhat.com>,
	linux-mtd@lists.infradead.org, linux-mm@kvack.org,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>,
	cgroups mailinglist <cgroups@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>,
	drbd-dev@lists.linbit.com
Subject: Re: [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init
Date: Mon, 20 Jul 2020 23:27:57 +0200	[thread overview]
Message-ID: <CAFLxGvyxtYnJ5UdD18uNA97zQaDB8-Wv8MHQn2g9GYD74v7cTg@mail.gmail.com> (raw)
In-Reply-To: <2827a5dbd94bc5c2c1706a6074d9a9a32a590feb.camel@gmail.com>

On Mon, Jul 20, 2020 at 2:37 PM Artem Bityutskiy <dedekind1@gmail.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

______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

  reply	other threads:[~2020-07-20 21:27 UTC|newest]

Thread overview: 71+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-20  7:51 bdi cleanups Christoph Hellwig
2020-07-20  7:51 ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 01/14] fs: remove the unused SB_I_MULTIROOT flag Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
     [not found] ` <20200720075148.172156-1-hch-jcswGhMUV9g@public.gmane.org>
2020-07-20  7:51   ` [PATCH 02/14] drbd: remove dead code in device_to_statistics Christoph Hellwig
2020-07-20  7:51     ` Christoph Hellwig
2020-07-20  7:51     ` Christoph Hellwig
2020-07-20  7:51   ` [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init Christoph Hellwig
2020-07-20  7:51     ` Christoph Hellwig
2020-07-20  7:51     ` Christoph Hellwig
2020-07-20 11:58     ` Richard Weinberger
2020-07-20 11:58       ` Richard Weinberger
2020-07-20 11:58       ` Richard Weinberger
2020-07-20 12:07       ` Christoph Hellwig
2020-07-20 12:07         ` Christoph Hellwig
     [not found]         ` <20200720120734.GA29061-jcswGhMUV9g@public.gmane.org>
2020-07-20 12:37           ` Artem Bityutskiy
2020-07-20 12:37             ` Artem Bityutskiy
2020-07-20 12:37             ` Artem Bityutskiy
2020-07-20 12:37             ` Artem Bityutskiy
2020-07-20 21:27             ` Richard Weinberger [this message]
2020-07-20 21:27               ` Richard Weinberger
2020-07-20 21:27               ` Richard Weinberger
     [not found]               ` <CAFLxGvyxtYnJ5UdD18uNA97zQaDB8-Wv8MHQn2g9GYD74v7cTg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-07-21  5:00                 ` Christoph Hellwig
2020-07-21  5:00                   ` Christoph Hellwig
2020-07-21  5:00                   ` Christoph Hellwig
2020-07-20  7:51   ` [PATCH 07/14] block: make QUEUE_SYSFS_BIT_FNS a little more useful Christoph Hellwig
2020-07-20  7:51     ` Christoph Hellwig
2020-07-20  7:51     ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 03/14] drbd: remove RB_CONGESTED_REMOTE Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 05/14] md: update the optimal I/O size on reshape Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 06/14] block: lift setting the readahead size into the block layer Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 08/14] block: add helper macros for queue sysfs entries Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 09/14] bdi: remove BDI_CAP_CGROUP_WRITEBACK Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 10/14] bdi: remove BDI_CAP_SYNCHRONOUS_IO Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 11/14] mm: use SWP_SYNCHRONOUS_IO more intelligently Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20 17:52   ` Shakeel Butt
2020-07-20 17:52     ` Shakeel Butt
2020-07-20 17:52     ` Shakeel Butt
     [not found]     ` <CALvZod7ACBnNX5W-gtTzheh8R-rxv1nB-5q7UcDUZ7BvtpakpA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-07-21  5:46       ` Minchan Kim
2020-07-21  5:46         ` Minchan Kim
2020-07-21  5:46         ` Minchan Kim
2020-07-20  7:51 ` [PATCH 12/14] bdi: replace BDI_CAP_STABLE_WRITES with a queue and a sb flag Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 13/14] bdi: invert BDI_CAP_NO_ACCT_WB Christoph Hellwig
2020-07-20  7:51   ` Christoph Hellwig
2020-07-20  7:51 ` [PATCH 14/14] bdi: replace BDI_CAP_NO_{WRITEBACK,ACCT_DIRTY} with a single flag Christoph Hellwig
2020-07-20  7:51   ` [PATCH 14/14] bdi: replace BDI_CAP_NO_{WRITEBACK, ACCT_DIRTY} " Christoph Hellwig
2020-07-22  6:25 bdi cleanups v2 Christoph Hellwig
2020-07-22  6:25 ` [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init Christoph Hellwig
2020-07-22  6:25   ` Christoph Hellwig
     [not found]   ` <20200722062552.212200-5-hch-jcswGhMUV9g@public.gmane.org>
2020-07-22  9:04     ` David Sterba
2020-07-22  9:04       ` David Sterba
2020-07-22  9:04       ` David Sterba
2020-07-22 11:15   ` Richard Weinberger
2020-07-22 11:15     ` Richard Weinberger
2020-07-22 11:15     ` Richard Weinberger
2020-07-22 11:15     ` Richard Weinberger
2020-07-24  7:32 bdi cleanups v3 Christoph Hellwig
2020-07-24  7:33 ` [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init Christoph Hellwig
2020-07-24  7:33   ` Christoph Hellwig
2020-07-28 12:15   ` Johannes Thumshirn
2020-07-28 12:15     ` Johannes Thumshirn
2020-07-26 15:03 bdi cleanups v3 Christoph Hellwig
     [not found] ` <20200726150333.305527-1-hch-jcswGhMUV9g@public.gmane.org>
2020-07-26 15:03   ` [PATCH 04/14] bdi: initialize ->ra_pages in bdi_init Christoph Hellwig
2020-07-26 15:03     ` Christoph Hellwig
2020-07-26 15:03     ` Christoph Hellwig

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