On Thu, Apr 11, 2019 at 08:33:13AM -0700, Matthew Wilcox wrote: > On Wed, Apr 10, 2019 at 06:43:53PM -0700, Suren Baghdasaryan wrote: > > Add new SS_EXPEDITE flag to be used when sending SIGKILL via > > pidfd_send_signal() syscall to allow expedited memory reclaim of the > > victim process. The usage of this flag is currently limited to SIGKILL > > signal and only to privileged users. > > What is the downside of doing expedited memory reclaim? ie why not do it > every time a process is going to die?
I agree with this. The oom reaper mostly does work the exiting task would have to do anyway, so this shouldn't be measurably more expensive to do it per default. I wouldn't want to add a new interface unless we really do need that type of control.
