Re: [Xen-devel] LVM Snapshot Troubles

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> I think it's worth trying GFP_NOFAIL just to see what happens.
> The correct fix is probably to wrap the page_alloc in a loop that
> retries a few times, maybe something like:
> 
>       unsigned long start = jiffies;
> 
>       while( (pl->page = alloc_page(GFP_KERNEL)) == NULL &&
>               jiffies - start < 5*HZ )
>               blk_congestion_wait(WRITE, HZ/5);

It's likely not helped by the fact the network driver has big
allocation spikes periodically when it refills the packet receive
ring. I'll check in something to smooth out those allocations...

 -- Keir


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