From: Matthew Wilcox <willy@infradead.org>
To: Mike Snitzer <snitzer@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
linux-raid@vger.kernel.org, linux-mm@kvack.org,
linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-block@vger.kernel.org, drbd-dev@tron.linbit.com,
dm-devel@redhat.com, Tejun Heo <tj@kernel.org>,
cgroups@vger.kernel.org, linux-btrfs@vger.kernel.org
Subject: Re: remove dead bdi congestion leftovers
Date: Wed, 1 Jul 2020 18:57:47 +0100 [thread overview]
Message-ID: <20200701175747.GT25523@casper.infradead.org> (raw)
In-Reply-To: <20200701164103.GC27063@redhat.com>
On Wed, Jul 01, 2020 at 12:41:03PM -0400, Mike Snitzer wrote:
> On Wed, Jul 01 2020 at 5:06am -0400,
> Christoph Hellwig <hch@lst.de> wrote:
>
> > Hi Jens,
> >
> > we have a lot of bdi congestion related code that is left around without
> > any use. This series removes it in preparation of sorting out the bdi
> > lifetime rules properly.
>
> I could do some git archeology to see what the fs, mm and block core
> changes were to stop using bdi congested but a pointer to associated
> changes (or quick recap) would save me some time.
>
> Also, curious to know how back-pressure should be felt back up the IO
> stack now? (apologies if these are well worn topics, I haven't been
> tracking this area of development).
It isn't. Jens declared the implementation was broken, and broke it
more. So we're just living with stupid broken timeouts.
next prev parent reply other threads:[~2020-07-01 17:57 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-01 9:06 remove dead bdi congestion leftovers Christoph Hellwig
2020-07-01 9:06 ` [PATCH 1/4] drbd: remove a bogus bdi_rw_congested call Christoph Hellwig
2020-07-01 9:06 ` [PATCH 2/4] writeback: remove {set,clear}_wb_congested Christoph Hellwig
2020-07-01 9:06 ` [PATCH 3/4] writeback: remove struct bdi_writeback_congested Christoph Hellwig
2020-07-01 9:06 ` [PATCH 4/4] writeback: remove bdi->congested_fn Christoph Hellwig
2020-07-01 14:48 ` David Sterba
2020-07-02 0:38 ` Coly Li
2020-07-02 5:36 ` Song Liu
2020-07-01 16:38 ` remove dead bdi congestion leftovers Tejun Heo
2020-07-01 16:41 ` Mike Snitzer
2020-07-01 17:57 ` Matthew Wilcox [this message]
2020-07-01 18:25 ` Matthew Wilcox
2020-07-08 23:14 ` Jens Axboe
2020-07-09 5:32 ` Christoph Hellwig
2020-07-09 13:58 ` Jens Axboe
2020-07-09 14:01 ` Christoph Hellwig
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