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Commit b03f6489 authored by Adrian Bunk's avatar Adrian Bunk Committed by Linus Torvalds
Browse files

build kernel/profile.o only when requested 



Build kernel/profile.o only if CONFIG_PROFILING is enabled.

This makes CONFIG_PROFILING=n kernels smaller.

As a bonus, some profile_tick() calls and one branch from schedule() are
now eliminated with CONFIG_PROFILING=n (but I doubt these are
measurable effects).

This patch changes the effects of CONFIG_PROFILING=n, but I don't think
having more than two choices would be the better choice.

This patch also adds the name of the first parameter to the prototypes
of profile_{hits,tick}() since I anyway had to add them for the dummy
functions.

Signed-off-by: default avatarAdrian Bunk <bunk@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 696adfe8

include/linux/profile.h

+39 −17
Original line number Diff line number Diff line
@@ -8,8 +8,6 @@ 


#include <asm/errno.h>



extern int prof_on __read_mostly;



#define CPU_PROFILING	1

#define SCHED_PROFILING	2

#define SLEEP_PROFILING	3
@@ -19,14 +17,29 @@ struct proc_dir_entry; 
struct pt_regs;

struct notifier_block;



#if defined(CONFIG_PROFILING) && defined(CONFIG_PROC_FS)

void create_prof_cpu_mask(struct proc_dir_entry *);

#else

#define create_prof_cpu_mask(x)			do { (void)(x); } while (0)

#endif



enum profile_type {

	PROFILE_TASK_EXIT,

	PROFILE_MUNMAP

};



#ifdef CONFIG_PROFILING



extern int prof_on __read_mostly;



/* init basic kernel profiler */

void __init profile_init(void);

void profile_tick(int);

void profile_tick(int type);



/*

 * Add multiple profiler hits to a given address:

 */

void profile_hits(int, void *ip, unsigned int nr_hits);

void profile_hits(int type, void *ip, unsigned int nr_hits);



/*

 * Single profiler hit:
@@ -40,19 +53,6 @@ static inline void profile_hit(int type, void *ip) 
		profile_hits(type, ip, 1);

}



#ifdef CONFIG_PROC_FS

void create_prof_cpu_mask(struct proc_dir_entry *);

#else

#define create_prof_cpu_mask(x)			do { (void)(x); } while (0)

#endif



enum profile_type {

	PROFILE_TASK_EXIT,

	PROFILE_MUNMAP

};



#ifdef CONFIG_PROFILING



struct task_struct;

struct mm_struct;
@@ -80,6 +80,28 @@ struct pt_regs; 


#else



#define prof_on 0



static inline void profile_init(void)

{

	return;

}



static inline void profile_tick(int type)

{

	return;

}



static inline void profile_hits(int type, void *ip, unsigned int nr_hits)

{

	return;

}



static inline void profile_hit(int type, void *ip)

{

	return;

}



static inline int task_handoff_register(struct notifier_block * n)

{

	return -ENOSYS;

kernel/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
# Makefile for the linux kernel.

#



obj-y     = sched.o fork.o exec_domain.o panic.o printk.o profile.o \

obj-y     = sched.o fork.o exec_domain.o panic.o printk.o \

	    cpu.o exit.o itimer.o time.o softirq.o resource.o \

	    sysctl.o capability.o ptrace.o timer.o user.o \

	    signal.o sys.o kmod.o workqueue.o pid.o \
@@ -24,6 +24,7 @@ CFLAGS_REMOVE_sched_clock.o = -pg 
CFLAGS_REMOVE_sched.o = -mno-spe -pg

endif



obj-$(CONFIG_PROFILING) += profile.o

obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o

obj-$(CONFIG_STACKTRACE) += stacktrace.o

obj-y += time/

kernel/profile.c

+0 −4
Original line number Diff line number Diff line
@@ -112,8 +112,6 @@ void __init profile_init(void) 


/* Profile event notifications */



#ifdef CONFIG_PROFILING



static BLOCKING_NOTIFIER_HEAD(task_exit_notifier);

static ATOMIC_NOTIFIER_HEAD(task_free_notifier);

static BLOCKING_NOTIFIER_HEAD(munmap_notifier);
@@ -203,8 +201,6 @@ void unregister_timer_hook(int (*hook)(struct pt_regs *)) 
}

EXPORT_SYMBOL_GPL(unregister_timer_hook);



#endif /* CONFIG_PROFILING */





#ifdef CONFIG_SMP

/*