Re: Ridiculous idea: Cache as ramdisk?

[Hiten Pandya <hmp@xxxxxxxxxxxxx>]

Matthew Dillon wrote:
>
>	[ ... great explanations snipped 8-) ... ]
>
>     The MFS filesystem comes fairly close to doing this already since
>     its backing store is simply the memory associated with a process, but
>     it has the disadvantage of causing data to be stored in memory twice
>     (once in the VM / buffer cache, once in the MFS's procs memory space).
>     Despite the duplication of data, the fact that MFS filesystems do not
>     automaticaly flush data to a physical storage device has proven to be
>     a huge performance advantage over the years.
>
>     So, in short, we already have the pieces, we just have to get them to
>     fit together in a reasonable way.

	Well, the problem about storing data twice will only affect us
	as long as we don't have a Slab Cache, [Bonwick94, Bonwick2001]
	but once that is in place, we will be much better off, memory
	allocation wise...

	Regards,

--
Hiten Pandya
hmp@xxxxxxxxxxxxx