Re: [PATCH 10/17] netvm: Allow skb allocation to use PFMEMALLOC reserves

From: Mel Gorman <mgorman@suse.de>
Date: Thu, 17 May 2012 15:50:24 +0100

Change the skb allocation API to indicate RX usage and use this to fall
back to the PFMEMALLOC reserve when needed. SKBs allocated from the
reserve are tagged in skb->pfmemalloc. If an SKB is allocated from
the reserve and the socket is later found to be unrelated to page
reclaim, the packet is dropped so that the memory remains available
for page reclaim. Network protocols are expected to recover from this
packet loss.

[davem@davemloft.net: Use static branches, coding style corrections]
[a.p.zijlstra@chello.nl: Ideas taken from various patches]
Signed-off-by: Mel Gorman <mgorman@suse.de>

Acked-by: David S. Miller <davem@davemloft.net>

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