Messages in this thread | | | Subject | Re: [PATCH 1/3] [PATCH i386] during VM oom condition, kill all threads in process group | From | Will Schmidt <> | Date | Fri, 08 Jun 2007 14:19:18 -0500 |
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On Thu, 2007-06-07 at 17:10 -0700, Andrew Morton wrote: > On Thu, 7 Jun 2007 18:16:21 -0500 > Anton Blanchard <anton@samba.org> wrote: > > > > > Hi, > > > > > zap_other_threads() requires tasklist_lock.
Yup, I missed that. Thanks for pointing it out.
> > > > > > If we're going to do this then we should probably create some new function > > > (with a better name) which takes tasklsit_lock and then calls > > > zap_other_threads().
I expect this will be a write_lock_irq() since zap_other_threads will be doing a bit more than just reading the task info.
This will be down in a do-page-fault failure path (see arch/*/mm/fault.c). I wonder if calling write_lock is going to be safe, or if its possible to get into a deadlock? i.e. should I branch back up to the survive: label if I can't take the lock? Would that even be sufficient? or is it not an issue here?
> > > > > > Does this patch fix any observed-in-the-real-world problem? If so, please > > > describe it. > > > > Yeah we have had complaints where threaded apps have only one thread > > shot down instead of the entire process. This leaves the application in > > a bad state, whereas if it had been killed cleanly the application could > > have restarted. > > > > My understanding is that fatal signals should kill all threads in the > > group. > > > > OK, well could we please get all that info appropriatelt captured in #2's > changelog? Yup, next spin I'll add more to the changelog.
> > Other architectures will probably need to implement this.
-Will
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