Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=2bd8e6d422a4f44c0994f909317eba80b0fe08a1
Commit: 2bd8e6d422a4f44c0994f909317eba80b0fe08a1
Parent: 38ad464d410dadceda1563f36bdb0be7fe4c8938
Author: Ingo Molnar <[EMAIL PROTECTED]>
AuthorDate: Mon Oct 15 17:00:02 2007 +0200
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Mon Oct 15 17:00:02 2007 +0200
sched: use constants if !CONFIG_SCHED_DEBUG
use constants if !CONFIG_SCHED_DEBUG.
this speeds up the code and reduces code-size:
text data bss dec hex filename
27464 3014 16 30494 771e sched.o.before
26929 3010 20 29959 7507 sched.o.after
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Peter Zijlstra <[EMAIL PROTECTED]>
Signed-off-by: Mike Galbraith <[EMAIL PROTECTED]>
Reviewed-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
include/linux/sched.h | 5 ++++-
kernel/sched.c | 6 ------
kernel/sched_fair.c | 28 ++++++++++++++++++++--------
3 files changed, 24 insertions(+), 15 deletions(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 9761b16..befca3f 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1402,15 +1402,18 @@ static inline void idle_task_exit(void) {}
extern void sched_idle_next(void);
+#ifdef CONFIG_SCHED_DEBUG
extern unsigned int sysctl_sched_latency;
extern unsigned int sysctl_sched_min_granularity;
extern unsigned int sysctl_sched_wakeup_granularity;
extern unsigned int sysctl_sched_batch_wakeup_granularity;
extern unsigned int sysctl_sched_stat_granularity;
extern unsigned int sysctl_sched_runtime_limit;
-extern unsigned int sysctl_sched_compat_yield;
extern unsigned int sysctl_sched_child_runs_first;
extern unsigned int sysctl_sched_features;
+#endif
+
+extern unsigned int sysctl_sched_compat_yield;
#ifdef CONFIG_RT_MUTEXES
extern int rt_mutex_getprio(struct task_struct *p);
diff --git a/kernel/sched.c b/kernel/sched.c
index 2520923..ae1544f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1659,12 +1659,6 @@ void sched_fork(struct task_struct *p, int clone_flags)
}
/*
- * After fork, child runs first. (default) If set to 0 then
- * parent will (try to) run first.
- */
-unsigned int __read_mostly sysctl_sched_child_runs_first = 1;
-
-/*
* wake_up_new_task - wake up a newly created task for the first time.
*
* This function will do some initial scheduler statistics housekeeping
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 5c15d8a..2e84aaf 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -21,6 +21,15 @@
*/
/*
+ * Tunables that become constants when CONFIG_SCHED_DEBUG is off:
+ */
+#ifdef CONFIG_SCHED_DEBUG
+# define const_debug __read_mostly
+#else
+# define const_debug static const
+#endif
+
+/*
* Targeted preemption latency for CPU-bound tasks:
* (default: 20ms, units: nanoseconds)
*
@@ -34,7 +43,13 @@
* systems, 4x on 8-way systems, 5x on 16-way systems, etc.)
* Targeted preemption latency for CPU-bound tasks:
*/
-unsigned int sysctl_sched_latency __read_mostly = 20000000ULL;
+const_debug unsigned int sysctl_sched_latency = 20000000ULL;
+
+/*
+ * After fork, child runs first. (default) If set to 0 then
+ * parent will (try to) run first.
+ */
+const_debug unsigned int sysctl_sched_child_runs_first = 1;
/*
* Minimal preemption granularity for CPU-bound tasks:
@@ -58,7 +73,7 @@ unsigned int __read_mostly sysctl_sched_compat_yield;
* and reduces their over-scheduling. Synchronous workloads will still
* have immediate wakeup/sleep latencies.
*/
-unsigned int sysctl_sched_batch_wakeup_granularity __read_mostly = 25000000UL;
+const_debug unsigned int sysctl_sched_batch_wakeup_granularity = 25000000UL;
/*
* SCHED_OTHER wake-up granularity.
@@ -68,13 +83,10 @@ unsigned int sysctl_sched_batch_wakeup_granularity
__read_mostly = 25000000UL;
* and reduces their over-scheduling. Synchronous workloads will still
* have immediate wakeup/sleep latencies.
*/
-unsigned int sysctl_sched_wakeup_granularity __read_mostly = 1000000UL;
+const_debug unsigned int sysctl_sched_wakeup_granularity = 1000000UL;
-unsigned int sysctl_sched_stat_granularity __read_mostly;
+const_debug unsigned int sysctl_sched_stat_granularity;
-/*
- * Initialized in sched_init_granularity() [to 5 times the base granularity]:
- */
unsigned int sysctl_sched_runtime_limit __read_mostly;
/*
@@ -89,7 +101,7 @@ enum {
SCHED_FEAT_SKIP_INITIAL = 32,
};
-unsigned int sysctl_sched_features __read_mostly =
+const_debug unsigned int sysctl_sched_features =
SCHED_FEAT_FAIR_SLEEPERS *1 |
SCHED_FEAT_SLEEPER_AVG *0 |
SCHED_FEAT_SLEEPER_LOAD_AVG *1 |
-
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