From: Peter Zijlstra <peterz@infradead.org>
To: Steve French <smfrench@gmail.com>
Cc: Tejun Heo <tj@kernel.org>,
ctalbott@google.com, rni@google.com, andrea@betterlinux.com,
containers@lists.linux-foundation.org,
linux-kernel@vger.kernel.org, lsf@lists.linux-foundation.org,
linux-mm@kvack.org, jmoyer@redhat.com, lizefan@huawei.com,
linux-fsdevel@vger.kernel.org, cgroups@vger.kernel.org
Subject: Re: [Lsf] [RFC] writeback and cgroup
Date: Sat, 14 Apr 2012 14:15:16 +0200 [thread overview]
Message-ID: <1334405716.2528.88.camel@twins> (raw)
In-Reply-To: <CAH2r5mvP56D0y4mk5wKrJcj+=OZ0e0Q5No_L+9a8a=GMcEhRew@mail.gmail.com>
On Wed, 2012-04-04 at 14:23 -0500, Steve French wrote:
> Current use of bdi is a little hard to understand since
> there are 25+ fields in the structure.
Filesystems only need a small fraction of those.
In particular,
backing_dev_info::name -- string
backing_dev_info::ra_pages -- number of read-ahead-pages
backing_dev_info::capability -- see BDI_CAP_*
One should properly initialize/destroy the thing using:
bdi_init()/bdi_destroy()
Furthermore, it has hooks into the regular page-writeback stuff:
test_{set,clear}_page_writeback()/bdi_writeout_inc()
set_page_dirty()/account_page_dirtied()
but also allows filesystems to do custom stuff, see FUSE for example.
The only other bit is the pressure valve, aka.
{set,clear}_bdi_congested(). Which really is rather broken and of
dubious value.
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next prev parent reply other threads:[~2012-04-14 12:15 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 18:36 [RFC] writeback and cgroup Tejun Heo
2012-04-04 14:51 ` Vivek Goyal
[not found] ` <20120404145134.GC12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-04 15:36 ` [Lsf] " Steve French
2012-04-04 18:56 ` Tejun Heo
2012-04-04 19:19 ` Vivek Goyal
[not found] ` <20120404191918.GK12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-25 8:47 ` Suresh Jayaraman
2012-04-04 18:49 ` Tejun Heo
2012-04-04 19:23 ` [Lsf] " Steve French
2012-04-14 12:15 ` Peter Zijlstra [this message]
2012-04-04 20:32 ` Vivek Goyal
[not found] ` <20120404203239.GM12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-04 23:02 ` Tejun Heo
[not found] ` <20120404184909.GB29686-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-05 16:38 ` Tejun Heo
[not found] ` <20120405163854.GE12854-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-05 17:13 ` Vivek Goyal
2012-04-14 11:53 ` [Lsf] " Peter Zijlstra
2012-04-07 8:00 ` Jan Kara
[not found] ` <20120407080027.GA2584-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-10 16:23 ` [Lsf] " Steve French
2012-04-10 18:16 ` Vivek Goyal
2012-04-10 18:06 ` Vivek Goyal
[not found] ` <20120410180653.GJ21801-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-10 21:05 ` Jan Kara
2012-04-10 21:20 ` Vivek Goyal
2012-04-10 22:24 ` Jan Kara
[not found] ` <20120410222425.GF4936-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-11 15:40 ` Vivek Goyal
2012-04-11 15:45 ` Vivek Goyal
2012-04-11 17:05 ` Jan Kara
2012-04-11 17:23 ` Vivek Goyal
[not found] ` <20120411172311.GF16692-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-11 19:44 ` Jan Kara
[not found] ` <20120411170542.GB16008-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-17 21:48 ` Tejun Heo
2012-04-18 18:18 ` Vivek Goyal
2012-04-11 19:22 ` Jan Kara
[not found] ` <20120411192231.GF16008-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-12 20:37 ` Vivek Goyal
2012-04-12 20:51 ` Tejun Heo
[not found] ` <20120412205148.GA24056-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-14 14:36 ` Fengguang Wu
2012-04-16 14:57 ` Vivek Goyal
2012-04-24 11:33 ` Fengguang Wu
2012-04-24 14:56 ` Jan Kara
2012-04-24 15:58 ` Vivek Goyal
[not found] ` <20120424155843.GG26708-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-25 2:42 ` Fengguang Wu
[not found] ` <20120424145655.GA1474-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-25 3:16 ` Fengguang Wu
2012-04-25 9:01 ` Jan Kara
[not found] ` <20120425090156.GB12568-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-25 12:05 ` Fengguang Wu
2012-04-15 11:37 ` [Lsf] " Peter Zijlstra
2012-04-17 22:01 ` Tejun Heo
2012-04-18 6:30 ` Jan Kara
2012-04-14 12:25 ` [Lsf] " Peter Zijlstra
2012-04-16 12:54 ` Vivek Goyal
2012-04-16 13:07 ` Fengguang Wu
2012-04-16 14:19 ` Fengguang Wu
2012-04-16 15:52 ` Vivek Goyal
[not found] ` <20120416155207.GB15437-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-17 2:14 ` Fengguang Wu
[not found] ` <20120403183655.GA23106-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-04 17:51 ` Fengguang Wu
2012-04-04 18:35 ` Vivek Goyal
[not found] ` <20120404183528.GJ12676-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2012-04-04 21:42 ` Fengguang Wu
2012-04-05 15:10 ` Vivek Goyal
2012-04-06 0:32 ` Fengguang Wu
2012-04-04 19:33 ` Tejun Heo
[not found] ` <20120404193355.GD29686-RcKxWJ4Cfj1J2suj2OqeGauc2jM2gXBXkQQo+JxHRPFibQn6LdNjmg@public.gmane.org>
2012-04-04 20:18 ` Vivek Goyal
2012-04-05 16:31 ` Tejun Heo
2012-04-05 17:09 ` Vivek Goyal
2012-04-06 9:59 ` Fengguang Wu
2012-04-17 22:38 ` Tejun Heo
[not found] ` <20120417223854.GG19975-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-19 14:23 ` Fengguang Wu
2012-04-19 18:31 ` Vivek Goyal
2012-04-20 12:45 ` Fengguang Wu
2012-04-20 19:29 ` Vivek Goyal
2012-04-20 21:33 ` Tejun Heo
2012-04-22 14:26 ` Fengguang Wu
2012-04-23 12:30 ` Vivek Goyal
2012-04-23 16:04 ` Tejun Heo
2012-04-19 20:26 ` Jan Kara
2012-04-20 13:34 ` Fengguang Wu
2012-04-20 19:08 ` Tejun Heo
[not found] ` <20120420190844.GH32324-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
2012-04-22 14:46 ` Fengguang Wu
2012-04-23 16:56 ` Tejun Heo
2012-04-24 7:58 ` Fengguang Wu
2012-04-25 15:47 ` Tejun Heo
2012-04-23 9:14 ` Jan Kara
2012-04-23 10:24 ` Fengguang Wu
2012-04-23 12:42 ` Jan Kara
2012-04-23 14:31 ` Fengguang Wu
2012-04-18 6:57 ` Jan Kara
[not found] ` <20120418065720.GA21485-+0h/O2h83AeN3ZZ/Hiejyg@public.gmane.org>
2012-04-18 7:58 ` Fengguang Wu
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