linux-kernel - Re: VFS hot tracking: How to calculate data temperature?

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Message-ID: <CAEH94LiYoeJEDxuHtK=z1sA5h7kzZQ1Day+U5o1SZDz-m8RYnA@mail.gmail.com>
Date:	Mon, 5 Nov 2012 10:29:39 +0800
From:	Zhi Yong Wu <zwu.kernel@...il.com>
To:	Zhi Yong Wu <zwu.kernel@...il.com>, linux-fsdevel@...r.kernel.org,
	linuxram@...ux.vnet.ibm.com, Dave Chinner <david@...morbit.com>,
	cmm@...ibm.com, Ben Chociej <bchociej@...il.com>,
	James Northrup <northrup.james@...il.com>,
	linux-kernel mlist <linux-kernel@...r.kernel.org>
Subject: Re: VFS hot tracking: How to calculate data temperature?

On Fri, Nov 2, 2012 at 4:41 PM, Zheng Liu <gnehzuil.liu@...il.com> wrote:
> On Fri, Nov 02, 2012 at 02:38:29PM +0800, Zhi Yong Wu wrote:
>> Here also has another question.
>>
>> How to save the file temperature among the umount to be able to
>> preserve the file tempreture after reboot?
>>
>> This above is the requirement from DB product.
>> I thought that we can save file temperature in its inode struct, that
>> is, add one new field in struct inode, then this info will be written
>> to disk with inode.
>>
>> Any comments or ideas are appreciated, thanks.
>
> Hi Zhiyong,
>
> I think that we might define a callback function.  If a filesystem wants
> to save these data, it can implement a function to save them.  The
> filesystem can decide whether adding it or not by themselves.
Great idea,  temperature saving function is maybe very specific to FS.
But i am wondering if we can find one generic way to save temperature
info at first.

>
> BTW, actually I don't really care about how to save these data because I
> only want to observe which file is accessed in real time, which is very
> useful for me to track a problem in our product system.
heh, but other guys or products care about this.

>
> Regards,
> Zheng



-- 
Regards,

Zhi Yong Wu
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