On Thu, Jul 22, 2021 at 11:20 PM Michal Hocko <mhocko@xxxxxxxx> wrote: > > On Thu 22-07-21 21:47:56, Suren Baghdasaryan wrote: > > On Thu, Jul 22, 2021, 7:04 PM Shakeel Butt <shakeelb@xxxxxxxxxx> wrote: > > > > > On Thu, Jul 22, 2021 at 6:14 PM Suren Baghdasaryan <surenb@xxxxxxxxxx> > > > wrote: > > > > > > > [...] > > > > + > > > > + mmap_read_lock(mm); > > > > > > How about mmap_read_trylock(mm) and return -EAGAIN on failure? > > > > > > > That sounds like a good idea. Thanks! I'll add that in the next respin. > > Why is that a good idea? Can you do anything meaningful about the > failure other than immediately retry the syscall and hope for the best? > Yes we can. Based on the situation/impact we can select more victims.
