ece8a684c7
Implement prof=sleep profiling. TASK_UNINTERRUPTIBLE sleeps will be taken as a profile hit, and every millisecond spent sleeping causes a profile-hit for the call site that initiated the sleep. Sample readprofile output on i386: 306 ps2_sendbyte 1.3973 432 call_usermodehelper_keys 1.9548 484 ps2_command 0.6453 790 __driver_attach 4.7879 1593 msleep 44.2500 3976 sync_buffer 64.1290 4076 do_lookup 12.4648 8587 sync_page 122.6714 20820 total 0.0067 (NOTE: architectures need to check whether get_wchan() can be called from deep within the wakeup path.) akpm: we need to mark more functions __sched. lock_sock(), msleep(), others.. akpm: the contention in do_lookup() is a surprise. Presumably doing disk reads for directory contents while holding i_mutex. [akpm@osdl.org: various fixes] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
126 lines
2.6 KiB
C
126 lines
2.6 KiB
C
#ifndef _LINUX_PROFILE_H
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#define _LINUX_PROFILE_H
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#ifdef __KERNEL__
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/cpumask.h>
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#include <linux/cache.h>
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#include <asm/errno.h>
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extern int prof_on __read_mostly;
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#define CPU_PROFILING 1
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#define SCHED_PROFILING 2
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#define SLEEP_PROFILING 3
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struct proc_dir_entry;
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struct pt_regs;
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struct notifier_block;
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/* init basic kernel profiler */
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void __init profile_init(void);
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void profile_tick(int);
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/*
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* Add multiple profiler hits to a given address:
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*/
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void profile_hits(int, void *ip, unsigned int nr_hits);
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/*
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* Single profiler hit:
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*/
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static inline void profile_hit(int type, void *ip)
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{
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/*
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* Speedup for the common (no profiling enabled) case:
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*/
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if (unlikely(prof_on == type))
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profile_hits(type, ip, 1);
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}
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#ifdef CONFIG_PROC_FS
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void create_prof_cpu_mask(struct proc_dir_entry *);
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#else
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#define create_prof_cpu_mask(x) do { (void)(x); } while (0)
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#endif
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enum profile_type {
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PROFILE_TASK_EXIT,
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PROFILE_MUNMAP
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};
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#ifdef CONFIG_PROFILING
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struct task_struct;
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struct mm_struct;
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/* task is in do_exit() */
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void profile_task_exit(struct task_struct * task);
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/* task is dead, free task struct ? Returns 1 if
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* the task was taken, 0 if the task should be freed.
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*/
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int profile_handoff_task(struct task_struct * task);
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/* sys_munmap */
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void profile_munmap(unsigned long addr);
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int task_handoff_register(struct notifier_block * n);
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int task_handoff_unregister(struct notifier_block * n);
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int profile_event_register(enum profile_type, struct notifier_block * n);
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int profile_event_unregister(enum profile_type, struct notifier_block * n);
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int register_timer_hook(int (*hook)(struct pt_regs *));
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void unregister_timer_hook(int (*hook)(struct pt_regs *));
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/* Timer based profiling hook */
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extern int (*timer_hook)(struct pt_regs *);
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struct pt_regs;
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#else
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static inline int task_handoff_register(struct notifier_block * n)
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{
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return -ENOSYS;
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}
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static inline int task_handoff_unregister(struct notifier_block * n)
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{
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return -ENOSYS;
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}
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static inline int profile_event_register(enum profile_type t, struct notifier_block * n)
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{
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return -ENOSYS;
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}
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static inline int profile_event_unregister(enum profile_type t, struct notifier_block * n)
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{
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return -ENOSYS;
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}
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#define profile_task_exit(a) do { } while (0)
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#define profile_handoff_task(a) (0)
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#define profile_munmap(a) do { } while (0)
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static inline int register_timer_hook(int (*hook)(struct pt_regs *))
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{
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return -ENOSYS;
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}
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static inline void unregister_timer_hook(int (*hook)(struct pt_regs *))
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{
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return;
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}
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#endif /* CONFIG_PROFILING */
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#endif /* __KERNEL__ */
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#endif /* _LINUX_PROFILE_H */
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