Messages in this thread | | | Date | Tue, 17 Nov 2009 10:29:03 +0000 | From | Alan Cox <> | Subject | Re: [PATCH 2/7] mmc: Don't use PF_MEMALLOC |
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On Tue, 17 Nov 2009 16:17:50 +0900 (JST) KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 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)
Alan
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