inet: frags: reorganize struct netns_frags

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 <[email protected]> Signed-off-by: David S. Miller <[email protected]> [bwh: Backported to 4.4: adjust context] Signed-off-by: Ben Hutchings <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
DespairFactor · Feb 8, 2019 · 29ff723 · 29ff723
1 parent 3399001
commit 29ff723
Showing 1 changed file with 5 additions and 4 deletions.
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
@@ -4,15 +4,16 @@
 #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;
  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;
 };
 
 /**