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c9239c927e
Some kernel code currently depends on the profiling subsystem solely for its task exit notifier. The rest of the profiling subsystem is left unused. Add a simple task exit notifier implemented in kernel/exit.c to make such code work properly even when profiling is disabled. This will allow unnecessary profiling code to be disabled without breakage. Signed-off-by: Danny Lin <danny@kdrag0n.dev> Signed-off-by: azrim <mirzaspc@gmail.com>
129 lines
2.4 KiB
C
129 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_PROFILE_H
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#define _LINUX_PROFILE_H
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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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#define CPU_PROFILING 1
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#define SCHED_PROFILING 2
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#define SLEEP_PROFILING 3
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#define KVM_PROFILING 4
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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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#if defined(CONFIG_PROFILING) && defined(CONFIG_PROC_FS)
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void create_prof_cpu_mask(void);
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int create_proc_profile(void);
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#else
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static inline void create_prof_cpu_mask(void)
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{
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}
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static inline int create_proc_profile(void)
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{
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return 0;
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}
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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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extern int prof_on __read_mostly;
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/* init basic kernel profiler */
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int profile_init(void);
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int profile_setup(char *str);
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void profile_tick(int type);
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int setup_profiling_timer(unsigned int multiplier);
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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 type, 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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struct task_struct;
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struct mm_struct;
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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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struct pt_regs;
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#else
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#define prof_on 0
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static inline int profile_init(void)
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{
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return 0;
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}
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static inline void profile_tick(int type)
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{
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return;
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}
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static inline void profile_hits(int type, void *ip, unsigned int nr_hits)
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{
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return;
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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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return;
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}
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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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#define profile_handoff_task(a) (0)
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#define profile_munmap(a) do { } while (0)
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#endif /* CONFIG_PROFILING */
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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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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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#endif /* _LINUX_PROFILE_H */
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