On 06/20/2012 05:37 AM, Mel Gorman wrote:
It could happen that all !SOCK_MEMALLOC sockets have buffered so much data that we're over the global rmem limit. This will prevent SOCK_MEMALLOC buffers from receiving data, which will prevent userspace from running, which is needed to reduce the buffered data. Fix this by exempting the SOCK_MEMALLOC sockets from the rmem limit. Once this change it applied, it is important that sockets that set SOCK_MEMALLOC do not clear the flag until the socket is being torn down. If this happens, a warning is generated and the tokens reclaimed to avoid accounting errors until the bug is fixed. [davem@xxxxxxxxxxxxx: Warning about clearing SOCK_MEMALLOC] Signed-off-by: Peter Zijlstra<a.p.zijlstra@xxxxxxxxx> Signed-off-by: Mel Gorman<mgorman@xxxxxxx> Acked-by: David S. Miller<davem@xxxxxxxxxxxxx>
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