On 12/24/2010 02:05 AM, John McCabe-Dansted wrote: > On Fri, Dec 24, 2010 at 2:48 PM, Mike Cao<[email protected]> wrote: >> On Thu, 2010-12-23 at 19:07 +0800, John McCabe-Dansted wrote: >>> On Thu, Dec 23, 2010 at 6:24 PM, Mike Cao<[email protected]> wrote: >>>> I wonder whether the /dev/zramX means zcache pools? >>> >>> From the page you linked "zram can be used to provide a compressed >>> swap, while zcache compresses filesystem cache pages". AFAICT zram and >>> zcache are two different tools for two different purposes. >>> >> I thought they should be the same thing, zcache now called zram.if >> not ,how we can make zcache tool ? > > I haven't found instructions on how to use zcache, but the difference > between zram and zcache is discussed here: > > http://lwn.net/Articles/397574/ >
The article is slightly misleading -- it gives the impression that zcache was developed to *replace* zram. In fact, zram and zcache are quite different: zcache compresses filesystem caches only and not anonymous (heap) pages, OTOH zram compression only anonymous pages and not pagecache pages. Currently, there is no easy way to test zcache as cleancache -- which is zcache's backend -- is not yet in mainline (or even staging). Nitin _______________________________________________ linux-mm-cc mailing list [email protected] http://lists.laptop.org/listinfo/linux-mm-cc
