On Fri, Feb 10, 2017 at 02:27:27PM +0100, Michal Hocko wrote: > On Fri 03-02-17 15:33:21, Shaohua Li wrote: > > Show MADV_FREE pages info in proc/sysfs files. > > How are we going to use this information? Why it isn't sufficient to > watch for lazyfree events? I mean this adds quite some code and it is > not clear (at least from the changelog) we we need this information.
It's just like any other meminfo we added to let user know what happens in the system. Users can use the info for monitoring/diagnosing. the lazyfree/lazyfreed events can't reflect the lazyfree page info because 'lazyfree - lazyfreed' doesn't equal current lazyfree pages and the events aren't per-node. I'll add more description in the changelog. Thanks, Shaohua
