[PATCH] rcu: add a prefetch() in rcu_do_batch()

On some workloads, (for example when lot of close() syscalls are done), RCU
qlen can be quite large, and RCU heads are no longer in cpu cache when
rcu_do_batch() is called.

This patch adds a prefetch() in rcu_do_batch() to give CPU a hint to bring
back cache lines containing 'struct rcu_head's.

Most list manipulations macros include prefetch(), but not open coded ones
(at least with current C compilers :) )

I got a nice speedup on a trivial benchmark (3.48 us per iteration instead
of 3.95 us on a 1.6 GHz Pentium-M)

while (1) { pipe(p); close(fd[0]); close(fd[1]);}

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: "Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 26bb5ff..3554b76 100644 (file)
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -235,12 +235,14 @@ static void rcu_do_batch(struct rcu_data *rdp)
 
        list = rdp->donelist;
        while (list) {
-               next = rdp->donelist = list->next;
+               next = list->next;
+               prefetch(next);
                list->func(list);
                list = next;
                if (++count >= rdp->blimit)
                        break;
        }
+       rdp->donelist = list;
 
        local_irq_disable();
        rdp->qlen -= count;