On Thu 02-08-18 19:27:40, Wei Wang wrote: > On 08/02/2018 07:00 PM, Tetsuo Handa wrote: > > On 2018/08/02 19:32, Wei Wang wrote: > > > On 08/01/2018 07:34 PM, Michal Hocko wrote: > > > > Do you have any numbers for how does this work in practice? > > > It works in this way: for example, we can set the parameter, balloon_pages_to_shrink, > > > to shrink 1GB memory once shrink scan is called. Now, we have a 8GB guest, and we balloon > > > out 7GB. When shrink scan is called, the balloon driver will get back 1GB memory and give > > > them back to mm, then the ballooned memory becomes 6GB. > > Since shrinker might be called concurrently (am I correct?), > > Not sure about it being concurrently, but I think it would be called > repeatedly as should_continue_reclaim() returns true. Multiple direct reclaimers might indeed invoke it concurrently. -- Michal Hocko SUSE Labs
