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Commit 6180d9de authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d64b5e85

include/linux/hashtable.h

+4 −0
Original line number Diff line number Diff line
@@ -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)]

net/core/dev.c

+1 −1
Original line number Diff line number Diff line
@@ -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;