Re: [RFC 0/8] Cpuset aware writeback

[Andrew Morton]

> On Wed, 17 Jan 2007 00:01:58 -0800 Paul Jackson <pj@xxxxxxx> wrote:
> Andrew wrote:
> > - consider going off-cpuset for critical allocations. 
> 
> We do ... in mm/page_alloc.c:
> 
>          * This is the last chance, in general, before the goto nopage.
>          * Ignore cpuset if GFP_ATOMIC (!wait) rather than fail alloc.
>          * See also cpuset_zone_allowed() comment in kernel/cpuset.c.
>          */
>         page = get_page_from_freelist(gfp_mask, order, zonelist, alloc_flags);
> 
> We also allow GFP_KERNEL requests to escape the current cpuset, to the nearest
> enclosing mem_exclusive cpuset, which is typically a big cpuset covering most
> of the system.

hrm.   So how come NFS is getting oom-killings?

The oom-killer normally spews lots of useful stuff, including backtrace.  For some
reason that's not coming out for Christoph.  Log facility level, perhaps?
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