From: Zheng Liu <gnehzuil.liu@gmail.com>
To: Zhi Yong Wu <zwu.kernel@gmail.com>
Cc: Dave Chinner <david@fromorbit.com>,
linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org,
linuxram@linux.vnet.ibm.com, viro@zeniv.linux.org.uk,
dave@jikos.cz, tytso@mit.edu, cmm@us.ibm.com,
Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Subject: Re: [RFC v3 09/13] vfs: add one wq to update map info periodically
Date: Thu, 18 Oct 2012 10:25:30 +0800 [thread overview]
Message-ID: <20121018022530.GB24939@gmail.com> (raw)
In-Reply-To: <CAEH94LjoanfL3piP89qM6MP6zdN0AybfeqJe0kR_5-DJ0mLH_w@mail.gmail.com>
On Wed, Oct 17, 2012 at 02:34:15PM +0800, Zhi Yong Wu wrote:
> >> diff --git a/fs/hot_tracking.h b/fs/hot_tracking.h
> >> index d19e64a..7a79a6d 100644
> >> --- a/fs/hot_tracking.h
> >> +++ b/fs/hot_tracking.h
> >> @@ -36,6 +36,9 @@
> >> */
> >> #define TIME_TO_KICK 400
> >>
> >> +/* set how often to update temperatures (seconds) */
> >> +#define HEAT_UPDATE_DELAY 400
> >
> > FWIW, 400 seconds is an unusual time period. It's expected that
> > periodic work might take place at intervals of 5 minutes, 10
> > minutes, etc, not 6m40s. It's much easier to predict and understand
> > behaviour if it's at a interval of whole units like minutes,
> > especially when looking at timestamped event traces. Hence 300s (5
> > minutes) makes a lot more sense as a period for updates...
> got it. thanks.
Hi Zhi Yong,
IMHO we'd better to make this value parameterized, and then the user
can adjust this value dynamically.
Regards,
Zheng
next prev parent reply other threads:[~2012-10-18 2:14 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-10 10:07 [RFC v3 00/13] vfs: hot data tracking zwu.kernel
2012-10-10 10:07 ` [RFC v3 01/13] btrfs: add one new mount option '-o hot_track' zwu.kernel
[not found] ` <5075632c.03cc440a.1b33.7805SMTPIN_ADDED@mx.google.com>
2012-10-10 12:21 ` Zhi Yong Wu
2012-10-10 12:21 ` Zhi Yong Wu
2012-10-10 13:11 ` Lukáš Czerner
2012-10-10 13:16 ` Zhi Yong Wu
2012-10-10 16:28 ` David Sterba
2012-10-11 13:41 ` Zhi Yong Wu
2012-10-11 14:35 ` Zhi Yong Wu
2012-10-11 14:41 ` David Sterba
2012-10-11 14:46 ` Zhi Yong Wu
2012-10-10 10:07 ` [RFC v3 02/13] vfs: introduce private radix tree structures zwu.kernel
2012-10-10 15:34 ` David Sterba
2012-10-11 13:35 ` Zhi Yong Wu
2012-10-10 10:07 ` [RFC v3 03/13] vfs: Initialize and free main data structures zwu.kernel
2012-10-10 10:07 ` [RFC v3 04/13] vfs: add function for collecting raw access info zwu.kernel
2012-10-10 10:07 ` [RFC v3 05/13] vfs: add two map arrays zwu.kernel
2012-10-10 10:07 ` [RFC v3 06/13] vfs: add hooks to enable hot data tracking zwu.kernel
2012-10-10 10:07 ` [RFC v3 07/13] vfs: add function for updating map arrays zwu.kernel
2012-10-10 10:07 ` [RFC v3 08/13] vfs: add aging function for old map info zwu.kernel
2012-10-10 10:07 ` [RFC v3 09/13] vfs: add one wq to update map info periodically zwu.kernel
2012-10-16 0:27 ` Dave Chinner
2012-10-17 6:34 ` Zhi Yong Wu
2012-10-18 2:25 ` Zheng Liu [this message]
2012-10-18 2:26 ` Zhi Yong Wu
2012-10-10 10:07 ` [RFC v3 10/13] vfs: register one memory shrinker zwu.kernel
2012-10-10 10:07 ` [RFC v3 11/13] vfs: add 3 new ioctl interfaces zwu.kernel
2012-10-15 7:48 ` Dave Chinner
2012-10-15 7:57 ` Zhi Yong Wu
2012-10-16 3:17 ` Dave Chinner
2012-10-16 4:18 ` Zhi Yong Wu
2012-10-19 8:21 ` Zhi Yong Wu
2012-10-10 10:07 ` [RFC v3 12/13] vfs: add debugfs support zwu.kernel
2012-10-10 16:53 ` David Sterba
2012-10-10 21:05 ` David Sterba
2012-10-15 7:55 ` Dave Chinner
2012-10-15 8:15 ` Zhi Yong Wu
2012-10-15 8:04 ` Dave Chinner
2012-10-15 8:47 ` Zhi Yong Wu
2012-10-10 10:07 ` [RFC v3 13/13] vfs: add documentation zwu.kernel
2012-10-15 0:35 ` Zheng Liu
2012-10-15 7:04 ` Zhi Yong Wu
2012-10-15 0:39 ` [RFC v3 00/13] vfs: hot data tracking Zheng Liu
2012-10-15 7:05 ` Zhi Yong Wu
2012-10-15 20:42 ` Dave Chinner
2012-10-17 8:57 ` Zhi Yong Wu
2012-10-18 4:29 ` Dave Chinner
2012-10-18 4:44 ` Zhi Yong Wu
2012-10-18 5:17 ` Dave Chinner
2012-10-18 5:24 ` Zhi Yong Wu
2012-10-19 8:29 ` Zhi Yong Wu
2012-10-16 0:04 ` [PATCH] xfs: add hot tracking support Dave Chinner
2012-11-07 8:38 ` Zhi Yong Wu
2012-11-08 5:13 ` Dave Chinner
2012-10-16 0:11 ` [RFC v3 00/13] vfs: hot data tracking Dave Chinner
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