[PATCH stable 4.9 v2 16/29] inet: frags: reorganize struct netns_frags

[Florian Fainelli]

From: Eric Dumazet <eduma...@google.com>

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 <eduma...@google.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
(cherry picked from commit c2615cf5a761b32bf74e85bddc223dfff3d9b9f0)
---
 include/net/inet_frag.h | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
index dea175f3418a..f47678d2ccc2 100644
--- a/include/net/inet_frag.h
+++ b/include/net/inet_frag.h
@@ -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;
 };
 
 /**
-- 
2.17.1