sched: Factor out load calculation code from sched/core.c --> sched/proc.c

This large chunk of load calculation code can be easily divorced
from the main core.c scheduler file, with only a couple
prototypes and externs added to a kernel/sched header.

Some recent commits expanded the code and the documentation of
it, making it large enough to warrant separation.  For example,
see:

  556061b, "sched/nohz: Fix rq->cpu_load[] calculations"
  5aaa0b7, "sched/nohz: Fix rq->cpu_load calculations some more"
  5167e8d, "sched/nohz: Rewrite and fix load-avg computation -- again"

More importantly, it helps reduce the size of the main
sched/core.c by yet another significant amount (~600 lines).

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/1366398650-31599-2-git-send-email-paul.gortmaker@windriver.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h
index ce39224d6155..a38ee0a0650e 100644
--- a/kernel/sched/sched.h
+++ b/kernel/sched/sched.h
@@ -10,8 +10,16 @@
 #include "cpupri.h"
 #include "cpuacct.h"
 
+struct rq;
+
 extern __read_mostly int scheduler_running;
 
+extern unsigned long calc_load_update;
+extern atomic_long_t calc_load_tasks;
+
+extern long calc_load_fold_active(struct rq *this_rq);
+extern void update_cpu_load_active(struct rq *this_rq);
+
 /*
  * Convert user-nice values [ -20 ... 0 ... 19 ]
  * to static priority [ MAX_RT_PRIO..MAX_PRIO-1 ],