[PATCH] sched: less aggressive idle balancing

Remove the special casing for idle CPU balancing.  Things like this are
hurting for example on SMT, where are single sibling being idle doesn't really
warrant a really aggressive pull over the NUMA domain, for example.

Signed-off-by: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/kernel/sched.c b/kernel/sched.c
index 8b035a8b3c30284e1a2140e8a3a98fe5c6b0329d..f665de34ed82c105bb87a6f5e9da164f0f90a924 100644 (file)
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1877,15 +1877,9 @@ nextgroup:
 
        /* Get rid of the scaling factor, rounding down as we divide */
        *imbalance = *imbalance / SCHED_LOAD_SCALE;
-
        return busiest;
 
 out_balanced:
-       if (busiest && (idle == NEWLY_IDLE ||
-                       (idle == SCHED_IDLE && max_load > SCHED_LOAD_SCALE)) ) {
-               *imbalance = 1;
-               return busiest;
-       }
 
        *imbalance = 0;
        return NULL;