route: move lwtunnel state to a single place

Commit 751a587ac9f9 ("route: fix breakage after moving lwtunnel state")
moved lwtstate to the end of dst_entry for 32bit archs. This makes it share
the cacheline with __refcnt which had an unkown effect on performance. For
this reason, the pointer was kept in place for 64bit archs.

However, later performance measurements showed this is of no concern. It
turns out that every performance sensitive path that accesses lwtstate
accesses also struct rtable or struct rt6_info which share the same cache
line.

Thus, to get rid of a few #ifdefs, move the field to the end of the struct
also for 64bit.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/dst.h b/include/net/dst.h
index 5c98443..6835d22 100644 (file)
--- a/include/net/dst.h
+++ b/include/net/dst.h
@@ -85,12 +85,11 @@ struct dst_entry {
 #endif
 
 #ifdef CONFIG_64BIT
-       struct lwtunnel_state   *lwtstate;
        /*
         * Align __refcnt to a 64 bytes alignment
         * (L1_CACHE_SIZE would be too much)
         */
-       long                    __pad_to_align_refcnt[1];
+       long                    __pad_to_align_refcnt[2];
 #endif
        /*
         * __refcnt wants to be on a different cache line from
@@ -99,9 +98,7 @@ struct dst_entry {
        atomic_t                __refcnt;       /* client references    */
        int                     __use;
        unsigned long           lastuse;
-#ifndef CONFIG_64BIT
        struct lwtunnel_state   *lwtstate;
-#endif
        union {
                struct dst_entry        *next;
                struct rtable __rcu     *rt_next;