[PATCH] sched: reduce task_struct size

more task_struct size reduction, by moving the debugging/instrumentation
fields to under CONFIG_SCHEDSTATS:

(i386, nodebug):

size
----
pre-CFS 1328
CFS 1472
CFS+patch 1376

Signed-off-by: Ingo Molnar <[e-mail]>

include/linux/sched.h

···
 	struct rb_node		run_node;
 	unsigned int		on_rq;
 
-	u64			wait_start_fair;
-	u64			wait_start;
 	u64			exec_start;
-	u64			sleep_start;
+	u64			sum_exec_runtime;
+	u64			wait_start_fair;
 	u64			sleep_start_fair;
-	u64			block_start;
+
+#ifdef CONFIG_SCHEDSTATS
+	u64			wait_start;
+	u64			wait_max;
+	s64			sum_wait_runtime;
+
+	u64			sleep_start;
 	u64			sleep_max;
+	s64			sum_sleep_runtime;
+
+	u64			block_start;
 	u64			block_max;
 	u64			exec_max;
-	u64			wait_max;
-	u64			last_ran;
 
-	u64			sum_exec_runtime;
-	s64			sum_wait_runtime;
-	s64			sum_sleep_runtime;
 	unsigned long		wait_runtime_overruns;
 	unsigned long		wait_runtime_underruns;
+#endif
+
 #ifdef CONFIG_FAIR_GROUP_SCHED
 	struct sched_entity	*parent;
 	/* rq on which this entity is (to be) queued: */