On Thursday 07 May 2009, Andrew Morton wrote: > On Thu, 7 May 2009 20:09:52 +0200 > "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: > > > > > > I'm suspecting that hibernation can allocate its pages with > > > > > __GFP_FS|__GFP_WAIT|__GFP_NORETRY|__GFP_NOWARN, and the page allocator > > > > > will dtrt: no oom-killings. > > > > > > > > > > In which case, processes_are_frozen() is not needed at all? > > > > > > > > __GFP_NORETRY alone causes it to fail relatively quickly, but I'll try with > > > > the combination. > > > > > > OK. __GFP_WAIT is the big hammer. > > > > Unfortunately it fails too quickly with the combination as well, so it looks > > like we can't use __GFP_NORETRY during hibernation. > > hm. > > So where do we stand now? > > I'm not a big fan of the global application-specific state change > thing. Something like __GFP_NO_OOM_KILL has a better chance of being > reused by other subsystems in the future, which is a good indicator. I'm not against __GFP_NO_OOM_KILL, but there's been some strong resistance to adding new _GPF _FOO flags recently. Is there any likelihood anyone else we'll really need it any time soon? The advantage of the freezer-based approach is that it disables the OOM killer when it's not going to work anyway, so it looks like a reasonable thing to do regardless. IMHO. -- To unsubscribe from this list: send the line "unsubscribe kernel-testers" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
