Re: [LSF/MM TOPIC] VFS hot tracking

[mingming cao <mingming@oracle.com>]

On 02/07/2013 08:24 AM, Zhi Yong Wu wrote:
> HI,
>
>     If some guy is interested in this topic, i would like to talk about
> VFS hot tracking.
>
>     The feature will add the support for tracking data temperature
> information in VFS layer. Essentially, this means maintaining some key
> hot data statistics (like number of reads/writes, last read/write
> time, frequency of reads/writes), then distilling those numbers down
> to a single "temperature" value that reflects what data is "hot", then
> specific FS such as btrfs will take use of the temperature infomation
> to move hot data to SSDs, or do the defragmetation.
>
>     In this talk, i would discuss its current implementation and how
> its key points are resolved such as memory consumption, how its hot
> data is updated periodically, etc.
>
>     If you have any suggestions, pleas let me know, thanks.
>
>

That sounds a good fit for the LSF discussion. I am happy to hear the 
update of this feature and where it will go from here. Especially 
discussions of APIs that expose the data hotness and how that 
information could be used by filesystems and storages.

Mingming