Re: [BUG] fatal hang untarring 90GB file, possibly writeback related.

Pekka Enberg
2011-05-10T10:33:11Z

On Tue, May 10, 2011 at 1:21 PM, Mel Gorman <mgorman@novell.com> wrote:
> It goes on. A number of filesystem and network paths are being hit
> with high-order allocs. i915 was a red herring, it's present but not
> in massive numbers. The filesystem, network and mempool allocations
> are likely to be kicking kswapd awake frequently and hurting overall
> system performance as a result.
>
> I really would like to hear if the fix makes a big difference or
> if we need to consider forcing SLUB high-order allocations bailing
> at the first sign of trouble (e.g. by masking out __GFP_WAIT in
> allocate_slab). Even with the fix applied, kswapd might be waking up
> less but processes will still be getting stalled in direct compaction
> and direct reclaim so it would still be jittery.

Yes, sounds reasonable to me.

Pekka

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