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inet: frags: reorganize struct netns_frags

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commit c2615cf5a761b32bf74e85bddc223dfff3d9b9f0 upstream.

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: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
[bwh: Backported to 4.4: adjust context]
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eric Dumazet 2018-10-10 12:30:04 -07:00 • committed by Greg Kroah-Hartman
parent 33990010ea
commit 29ff723c54
1 changed files with 5 additions and 4 deletions
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9
include/net/inet_frag.h
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@ -4,15 +4,16 @@
#include <linux/rhashtable.h> #include <linux/rhashtable.h>
struct netns_frags { 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 */ /* sysctls */
long high_thresh; long high_thresh;
long low_thresh; long low_thresh;
int timeout; int timeout;
struct inet_frags *f; 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;
}; };
/** /**