linux-kernel - Re: [RFC v3 09/13] vfs: add one wq to update map info periodically

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Message-ID: <CAEH94Lh9vmXaOw3-ezKLwfUw5ZwXcV7Wkumy6sYUTiFQ+NEzyA@mail.gmail.com>
Date:	Thu, 18 Oct 2012 10:26:48 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Zhi Yong Wu <zwu.kernel@...il.com>,
	Dave Chinner <david@...morbit.com>,
	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	dave@...os.cz, tytso@....edu, cmm@...ibm.com,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC v3 09/13] vfs: add one wq to update map info periodically

On Thu, Oct 18, 2012 at 10:25 AM, Zheng Liu <gnehzuil.liu@...il.com> wrote:
> 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.
Yeah, this has been in my TODO list. But i want to make the core
function can work at first.

>
> Regards,
> Zheng



-- 
Regards,

Zhi Yong Wu
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