From: Peter Zijlstra <peterz@infradead.org>
To: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>,
Richard Kennedy <richard@rsk.demon.co.uk>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH 4/4] writeback: reduce per-bdi dirty threshold ramp up time
Date: Tue, 24 May 2011 14:41:58 +0200 [thread overview]
Message-ID: <1306240918.2497.53.camel@laptop> (raw)
In-Reply-To: <1306239869.2497.50.camel@laptop>
On Tue, 2011-05-24 at 14:24 +0200, Peter Zijlstra wrote:
> Again, if we then measure t in the same events as x, such that:
>
> t = \Sum_i x_i
> However, if you start measuring t differently that breaks, and the
> result is no longer normalized and thus not suitable as a proportion.
Ah, I made a mistake there, your proposal would keep the above relation
true, but the discrete periods t_i wouldn't be uniform.
So disregard the non normalized criticism.
WARNING: multiple messages have this Message-ID (diff)
From: Peter Zijlstra <peterz@infradead.org>
To: Jan Kara <jack@suse.cz>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>,
Richard Kennedy <richard@rsk.demon.co.uk>,
Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH 4/4] writeback: reduce per-bdi dirty threshold ramp up time
Date: Tue, 24 May 2011 14:41:58 +0200 [thread overview]
Message-ID: <1306240918.2497.53.camel@laptop> (raw)
In-Reply-To: <1306239869.2497.50.camel@laptop>
On Tue, 2011-05-24 at 14:24 +0200, Peter Zijlstra wrote:
> Again, if we then measure t in the same events as x, such that:
>
> t = \Sum_i x_i
> However, if you start measuring t differently that breaks, and the
> result is no longer normalized and thus not suitable as a proportion.
Ah, I made a mistake there, your proposal would keep the above relation
true, but the discrete periods t_i wouldn't be uniform.
So disregard the non normalized criticism.
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next prev parent reply other threads:[~2011-05-24 12:38 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-13 8:59 [PATCH 0/4] trivial writeback fixes Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 8:59 ` [PATCH 1/4] writeback: add bdi_dirty_limit() kernel-doc Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 21:47 ` Jan Kara
2011-04-13 21:47 ` Jan Kara
2011-04-13 8:59 ` [PATCH 2/4] writeback: avoid duplicate balance_dirty_pages_ratelimited() calls Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 21:53 ` Jan Kara
2011-04-13 21:53 ` Jan Kara
2011-04-14 0:30 ` Wu Fengguang
2011-04-14 0:30 ` Wu Fengguang
2011-04-14 10:20 ` Jan Kara
2011-04-14 10:20 ` Jan Kara
2011-04-13 8:59 ` [PATCH 3/4] writeback: skip balance_dirty_pages() for in-memory fs Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 21:54 ` Jan Kara
2011-04-13 21:54 ` Jan Kara
2011-04-13 8:59 ` [PATCH 4/4] writeback: reduce per-bdi dirty threshold ramp up time Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 8:59 ` Wu Fengguang
2011-04-13 22:04 ` Jan Kara
2011-04-13 22:04 ` Jan Kara
2011-04-13 23:31 ` Wu Fengguang
2011-04-13 23:31 ` Wu Fengguang
2011-04-13 23:52 ` Dave Chinner
2011-04-13 23:52 ` Dave Chinner
2011-04-14 0:23 ` Wu Fengguang
2011-04-14 0:23 ` Wu Fengguang
2011-04-14 10:36 ` Richard Kennedy
2011-04-14 10:36 ` Richard Kennedy
2011-04-14 13:49 ` Wu Fengguang
2011-04-14 13:49 ` Wu Fengguang
2011-04-14 14:08 ` Wu Fengguang
2011-04-14 15:14 ` Wu Fengguang
2011-04-14 15:56 ` Wu Fengguang
2011-04-14 18:16 ` Jan Kara
2011-04-14 18:16 ` Jan Kara
2011-04-15 3:43 ` Wu Fengguang
2011-04-15 14:37 ` Wu Fengguang
2011-04-15 22:13 ` Jan Kara
2011-04-15 22:13 ` Jan Kara
2011-04-16 6:05 ` Wu Fengguang
2011-04-16 6:05 ` Wu Fengguang
2011-04-16 8:33 ` Peter Zijlstra
2011-04-16 8:33 ` Peter Zijlstra
2011-04-16 14:21 ` Wu Fengguang
2011-04-17 2:11 ` Wu Fengguang
2011-04-17 2:11 ` Wu Fengguang
2011-04-18 14:59 ` Jan Kara
2011-04-18 14:59 ` Jan Kara
2011-05-24 12:24 ` Peter Zijlstra
2011-05-24 12:24 ` Peter Zijlstra
2011-05-24 12:41 ` Peter Zijlstra [this message]
2011-05-24 12:41 ` Peter Zijlstra
2011-06-09 23:58 ` Jan Kara
2011-06-09 23:58 ` Jan Kara
2011-04-13 10:15 ` [PATCH 0/4] trivial writeback fixes Peter Zijlstra
2011-04-13 10:15 ` Peter Zijlstra
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