Messages in this thread | | | Date | Thu, 21 Nov 2013 11:12:58 +0800 | Subject | Re: [PATCH] mm/zswap: change params from hidden to ro | From | Weijie Yang <> |
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On Thu, Nov 21, 2013 at 1:52 AM, Dan Streetman <ddstreet@ieee.org> wrote: > On Wed, Nov 20, 2013 at 12:33 PM, Vladimir Murzin <murzin.v@gmail.com> wrote: >> Hi Dan! >> >> On Wed, Nov 20, 2013 at 11:38:42AM -0500, Dan Streetman wrote: >>> The "compressor" and "enabled" params are currently hidden, >>> this changes them to read-only, so userspace can tell if >>> zswap is enabled or not and see what compressor is in use. >> >> Could you elaborate more why this pice of information is necessary for >> userspace? > > For anyone interested in zswap, it's handy to be able to tell if it's > enabled or not ;-) Technically people can check to see if the zswap > debug files are in /sys/kernel/debug/zswap, but I think the actual > "enabled" param is more obvious. And the compressor param is really > the only way anyone from userspace can see what compressor's being > used; that's helpful to know for anyone that might want to be using a > non-default compressor. > > And of course, eventually we'll want to make the params writable, so > the compressor can be changed dynamically, and zswap can be enabled or > disabled dynamically (or at least enabled after boot).
Please do not make them writable. There is no requirement to do that, and it will make zswap more complex.
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