kernel work week of 3-Feb-2010 HEADS UP
Francois Tigeot
ftigeot at wolfpond.org
Thu Feb 4 09:10:46 PST 2010
On Wed, Feb 03, 2010 at 11:32:43AM -0800, Matthew Dillon wrote:
>
> What I will be doing this week and possibly into next week is
> implementing a system-wide cache-to-swap feature for objects backed
> by the VM system. Such objects include file data and filesystem
> meta-data. The type of data/meta-data to cache will be selectable with
> a sysctl and the write-bandwidth to the SSD will also be manageable.
That would be awesome :-)
Would it be possible to implement this as a multi-stage caching system ? Hard
drives come in 3 or 4 different speed grades these days and a caching layer
going from fastest drives to slow drives would make a lot of sense.
We could have this situation in a file server:
32 GB SSD > 300GB in 15,000 RPM drives > 10s of TB in 7200 RPM drives
Which is not too different from the multi-level caches of CPUs these days...
--
Francois Tigeot
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