[PATCH] sched: introduce child field in sched_domain

Introduce the child field in sched_domain struct and use it in
sched_balance_self().

We will also use this field in cleaning up the sched group cpu_power
setup(done in a different patch) code.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 38530232d92f..8e26c9069f15 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -644,6 +644,7 @@ struct sched_group {
 struct sched_domain {
         /* These fields must be setup */
         struct sched_domain *parent;    /* top domain must be null terminated */
+        struct sched_domain *child;     /* bottom domain must be null terminated */
         struct sched_group *groups;     /* the balancing groups of the domain */
         cpumask_t span;                 /* span of all CPUs in this domain */
         unsigned long min_interval;     /* Minimum balance interval ms */
diff --git a/include/linux/topology.h b/include/linux/topology.h
index ec1eca85290a..486bec23f986 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -89,6 +89,7 @@
 #define SD_SIBLING_INIT (struct sched_domain) {         \
         .span                   = CPU_MASK_NONE,        \
         .parent                 = NULL,                 \
+        .child                  = NULL,                 \
         .groups                 = NULL,                 \
         .min_interval           = 1,                    \
         .max_interval           = 2,                    \
@@ -119,6 +120,7 @@
 #define SD_CPU_INIT (struct sched_domain) {             \
         .span                   = CPU_MASK_NONE,        \
         .parent                 = NULL,                 \
+        .child                  = NULL,                 \
         .groups                 = NULL,                 \
         .min_interval           = 1,                    \
         .max_interval           = 4,                    \
@@ -146,6 +148,7 @@
 #define SD_ALLNODES_INIT (struct sched_domain) {        \
         .span                   = CPU_MASK_NONE,        \
         .parent                 = NULL,                 \
+        .child                  = NULL,                 \
         .groups                 = NULL,                 \
         .min_interval           = 64,                   \
         .max_interval           = 64*num_online_cpus(), \