Messages in this thread | | | Date | Sat, 21 Mar 2009 03:26:36 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH 3/3] compcache documentation |
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On Fri, 20 Mar 2009 19:44:08 +0530 Nitin Gupta <ngupta@vflare.org> wrote:
> ... > > + backing_dev: This is block device to be used as backing store for compcache. > + It must be a valid swap partition. We move data to this device when we > + encounter incompressible page or memlimit is reached. TODO: we may also > + move some pages from compcache to this device in case system is really > + low on memory. > + This device is not directly visible to kernel as a swap device > + (/proc/swaps will only show /dev/ramzswap0 and not this device). > + Managing this backing device is the job of compcache module.
hrm, OK, it kinda/sorta/maybe might be a little bit like a "compressed cache". But if someone comes up with a real compressed cache (ie: pagecache) then they'll want their name back.
Also, the kernel already has a widespread and well-established "backing device" concept, in include/linux/backing-dev.h. This new feature's poaching of that identifier is a bit confusing. It would be nice to do a wholesale rename if possible. secondary_dev? nv_dev?
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