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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>
This commit is contained in:
Eric Dumazet 2015-11-18 06:31:01 -08:00 committed by David S. Miller
parent d64b5e85bf
commit 6180d9de61
2 changed files with 5 additions and 1 deletions
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4
include/linux/hashtable.h
View File

@ -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)]

2
net/core/dev.c
View File

@ -184,7 +184,7 @@ EXPORT_SYMBOL(dev_base_lock);
static DEFINE_SPINLOCK(napi_hash_lock);
static unsigned int napi_gen_id = NR_CPUS;
static DEFINE_HASHTABLE(napi_hash, 8);
static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
static seqcount_t devnet_rename_seq;