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Commit 5b68fda0 authored by Eric Dumazet's avatar Eric Dumazet Committed by Greg Kroah-Hartman
Browse files

inet: frags: reorganize struct netns_frags 



Put the read-mostly fields in a separate cache line
at the beginning of struct netns_frags, to reduce
false sharing noticed in inet_frag_kill()

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
(cherry picked from commit c2615cf5a761b32bf74e85bddc223dfff3d9b9f0)
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 6060bcdc

include/net/inet_frag.h

+5 −4
Original line number Diff line number Diff line
@@ -4,16 +4,17 @@ 
#include <linux/rhashtable.h>



struct netns_frags {

	struct rhashtable       rhashtable ____cacheline_aligned_in_smp;



	/* Keep atomic mem on separate cachelines in structs that include it */

	atomic_long_t		mem ____cacheline_aligned_in_smp;

	/* sysctls */

	long			high_thresh;

	long			low_thresh;

	int			timeout;

	int			max_dist;

	struct inet_frags	*f;



	struct rhashtable       rhashtable ____cacheline_aligned_in_smp;



	/* Keep atomic mem on separate cachelines in structs that include it */

	atomic_long_t		mem ____cacheline_aligned_in_smp;

};



/**