On Tue, Nov 3, 2020 at 1:32 PM Minchan Kim <minchan@xxxxxxxxxx> wrote: > > On Tue, Nov 03, 2020 at 10:35:50AM +0100, Michal Hocko wrote: > > On Mon 02-11-20 12:29:24, Suren Baghdasaryan wrote: > > [...] > > > To follow up on this. Should I post an RFC implementing SIGKILL_SYNC > > > which in addition to sending a kill signal would also reap the > > > victim's mm in the context of the caller? Maybe having some code will > > > get the discussion moving forward? > > > > Yeah, having a code, even preliminary, might help here. This definitely > > needs a good to go from process management people as that proper is land > > full of surprises... > > Just to remind a idea I suggested to reuse existing concept > > fd = pidfd_open(victim process) > fdatasync(fd); > close(fd); > Yep, I just posted a comment about that. I think though your above sequence is missing a pidfd_send_signal(fd, SIGKILL) before the fdatasync(fd)... Not sure if fdatasync(pidfd) or fsync(pidfd) would be more appropriate for this but will use one and we can discuss details in the RFC with the code. Thanks!
