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SubjectRe: [PATCH 3/3] compcache documentation
Andrew Morton wrote:
> On Fri, 20 Mar 2009 19:44:08 +0530 Nitin Gupta <> 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.
Rename is in progress: compcache->ramzswap :)

> 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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