linux-ext4 - Re: [RFC v2 03/10] vfs: add one new mount option '-o hottrack'

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Message-ID: <CAEH94LimEZcAFKFMVNUzBcTeDxvkgeD3jCO3AgmkEKXVE4ym+A@mail.gmail.com>
Date:	Thu, 27 Sep 2012 13:25:34 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Dave Chinner <david@...morbit.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, viro@...iv.linux.org.uk,
	cmm@...ibm.com, tytso@....edu, marco.stornelli@...il.com,
	stroetmann@...olinux.com, diegocg@...il.com, chris@...muel.org,
	Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
Subject: Re: [RFC v2 03/10] vfs: add one new mount option '-o hottrack'

On Tue, Sep 25, 2012 at 5:28 PM, Dave Chinner <david@...morbit.com> wrote:
> On Sun, Sep 23, 2012 at 08:56:28PM +0800, zwu.kernel@...il.com wrote:
>> From: Zhi Yong Wu <wuzhy@...ux.vnet.ibm.com>
>>
>>   Introduce one new mount option '-o hottrack',
>> and add its parsing support.
>>   Its usage looks like:
>>    mount -o hottrack
>>    mount -o nouser,hottrack
>>    mount -o nouser,hottrack,loop
>>    mount -o hottrack,nouser
>
> I think that this option parsing should be done by the filesystem,
> even though the tracking functionality is in the VFS. That way ony
> the filesystems that can use the tracking information will turn it
> on, rather than being able to turn it on for everything regardless
> of whether it is useful or not.
>
> Along those lines, just using a normal superblock flag to indicate
> it is active (e.g. MS_HOT_INODE_TRACKING in sb->s_flags) means you
> don't need to allocate the sb->s_hot_info structure just to be able
If we don't allocate one sb->s_hot_info, where will those hash list
head and btree roots locate?

> to check whether we are tracking hot inodes or not.
>
> This then means the hot inode tracking for the superblock can be
> initialised by the filesystem as part of it's fill_super method,
> along with the filesystem specific code that will use the hot
> tracking information the VFS gathers....
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> david@...morbit.com



-- 
Regards,

Zhi Yong Wu
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