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authorEric Dumazet <edumazet@google.com>2015-11-18 17:31:01 +0300
committerDavid S. Miller <davem@davemloft.net>2015-11-19 00:17:42 +0300
commit6180d9de61a5c461f9e3efef5417a844701dbbb2 (patch)
tree721d4b7a92759fe2951844e6a6f8474cb5fccf97 /include/linux/hashtable.h
parentd64b5e85bfe2fe4c790abcbd16d9ae32391ddd7e (diff)
downloadlinux-6180d9de61a5c461f9e3efef5417a844701dbbb2.tar.xz
net: move napi_hash[] into read mostly section
We do not often add/delete a napi context. Moving napi_hash[] into read mostly section avoids potential false sharing. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/hashtable.h')
-rw-r--r--include/linux/hashtable.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/hashtable.h b/include/linux/hashtable.h
index 519b6e2d769e..661e5c2a8e2a 100644
--- a/include/linux/hashtable.h
+++ b/include/linux/hashtable.h
@@ -16,6 +16,10 @@
struct hlist_head name[1 << (bits)] = \
{ [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
+#define DEFINE_READ_MOSTLY_HASHTABLE(name, bits) \
+ struct hlist_head name[1 << (bits)] __read_mostly = \
+ { [0 ... ((1 << (bits)) - 1)] = HLIST_HEAD_INIT }
+
#define DECLARE_HASHTABLE(name, bits) \
struct hlist_head name[1 << (bits)]