Re: [PATCH 09/17] netvm: Allow the use of __GFP_MEMALLOC byspecific sockets
From: David Miller
Date: Fri May 11 2012 - 00:51:05 EST
From: Mel Gorman <mgorman@xxxxxxx>
Date: Thu, 10 May 2012 14:45:02 +0100
> Allow specific sockets to be tagged SOCK_MEMALLOC and use
> __GFP_MEMALLOC for their allocations. These sockets will be able to go
> below watermarks and allocate from the emergency reserve. Such sockets
> are to be used to service the VM (iow. to swap over). They must be
> handled kernel side, exposing such a socket to user-space is a bug.
> There is a risk that the reserves be depleted so for now, the
> administrator is responsible for increasing min_free_kbytes as
> necessary to prevent deadlock for their workloads.
> [a.p.zijlstra@xxxxxxxxx: Original patches]
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>
After sk_allocation() is adjusted to be sk_gfp_atomic() as I suggested
in my feedback for patch #8, this is fine.
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