On 03/15/12 17:37, Konrad Rzeszutek Wilk wrote:
On Tue, Mar 13, 2012 at 11:34:46AM +0100, Florian Schmaus wrote:
From: Andor Daam<andor.daam@xxxxxxxxxxxxxx>
This patch makes dynamic enabling/disabling of zcache via a sysfsnode possible.
There should be an patch to the Documentation/ABI/testing for these parameters.
Agreed. Currently none of the modifiable zcache parameters has any
Documentation in ABI/testing, including:
- zv_max_zsize
- zv_max_mean_zsize
- zv_page_count_policy
We are also thinking about providing a patch that moves all read only
zcache sysfs attributes into debugfs, so that the debug values from
cleancache, frontswap and zcache are all within /sys/kernel/debug. It
has also the advantage that if one doesn't want the performance impact
of those counters, he could easily compile zcache without them.
This patch could also include the missing Documentation.
The node is used to toggle the preexisting zcache_freeze variable to
stop/start accepting pages by zcache.
What is the reasoning to do this in the frontend instead of the backend (Cleancache/frontswap)?
Not sure if you just confused frontend with backend. We always thought like
frontend: cleancache/frontswap
backend: zcache (or Xen tmem, ...)
The reason to disable ("freeze") zcache via an mm/zcache sysfs interface
is simply that this only affects zcache behavior and not the frontend(s)
nor any other registered backend (which isn't currently possible anyways).
Florian
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