On Tue 27-06-17 20:39:28, Tetsuo Handa wrote: > Michal Hocko wrote: > > > I wonder why you prefer timeout based approach. Your patch will after all > > > set MMF_OOM_SKIP if operations between down_write() and up_write() took > > > more than one second. > > > > if we reach down_write then we have unmapped the address space in > > exit_mmap and oom reaper cannot do much more. > > So, by the time down_write() is called, majority of memory is already > released, isn't it?
In most cases yes. To be put it in other words. By the time exit_mmap takes down_write there is nothing more oom reaper could reclaim. -- Michal Hocko SUSE Labs
