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Commit 2bd8e6d4 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 38ad464d

include/linux/sched.h

+4 −1
Original line number Diff line number Diff line
@@ -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);

kernel/sched.c

+0 −6
Original line number Diff line number Diff line
@@ -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.

 *

kernel/sched_fair.c

+20 −8
Original line number Diff line number Diff line
@@ -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 |