Am Dienstag, 17. November 2009 11:32:36 schrieb Minchan Kim: > On Tue, Nov 17, 2009 at 7:29 PM, Alan Cox <alan@xxxxxxxxxxxxxxxxxxx> wrote: > > On Tue, 17 Nov 2009 16:17:50 +0900 (JST) > > > > KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> wrote: > >> Non MM subsystem must not use PF_MEMALLOC. Memory reclaim need few > >> memory, anyone must not prevent it. Otherwise the system cause > >> mysterious hang-up and/or OOM Killer invokation. > > > > So now what happens if we are paging and all our memory is tied up for > > writeback to a device or CIFS etc which can no longer allocate the memory > > to complete the write out so the MM can reclaim ? > > > > Am I missing something or is this patch set not addressing the case where > > the writeback thread needs to inherit PF_MEMALLOC somehow (at least for > > the I/O in question and those blocking it) > > I agree. > At least, drivers for writeout is proper for using PF_MEMALLOC, I think. For the same reason error handling should also use it, shouldn't it? Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
