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authorMel Gorman <mgorman@suse.de>2012-07-31 16:44:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-07-31 18:42:46 -0700
commitc93bdd0e03e848555d144eb44a1f275b871a8dd5 (patch)
tree8aff3bc2b9ff9f32e51040a7652bfb31257db626 /mm
parent7cb0240492caea2f6467f827313478f41877e6ef (diff)
netvm: allow skb allocation to use PFMEMALLOC reserves
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. [a.p.zijlstra@chello.nl: Ideas taken from various patches] [davem@davemloft.net: Use static branches, coding style corrections] [sebastian@breakpoint.cc: Avoid unnecessary cast, fix !CONFIG_NET build] Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: David S. Miller <davem@davemloft.net> Cc: Neil Brown <neilb@suse.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Christie <michaelc@cs.wisc.edu> Cc: Eric B Munson <emunson@mgebm.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Cc: Mel Gorman <mgorman@suse.de> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/internal.h3
1 files changed, 0 insertions, 3 deletions
diff --git a/mm/internal.h b/mm/internal.h
index eb76b67890d..3314f79d775 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -279,9 +279,6 @@ static inline struct page *mem_map_next(struct page *iter,
#define __paginginit __init
#endif
-/* Returns true if the gfp_mask allows use of ALLOC_NO_WATERMARK */
-bool gfp_pfmemalloc_allowed(gfp_t gfp_mask);
-
/* Memory initialisation debug and verification */
enum mminit_level {
MMINIT_WARNING,