Re: [PATCH v3 1/2] mm: introduce process_mrelease system call
From: Michal Hocko
Date: Fri Jul 23 2021 - 02:20:35 EST
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?