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sched: use constants if !CONFIG_SCHED_DEBUG

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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 <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:02 +02:00
parent 38ad464d41
commit 2bd8e6d422
3 changed files with 24 additions and 15 deletions
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5
include/linux/sched.h
View file

@ -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);

6
kernel/sched.c
View file

@ -1658,12 +1658,6 @@ void sched_fork(struct task_struct *p, int clone_flags)
put_cpu();
}
/*
* 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.
*

28
kernel/sched_fair.c
View file

@ -20,6 +20,15 @@
* Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com>
*/
/*
* 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 |