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drivers/oprofile/timer_int.c
2.54 KB
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/** * @file timer_int.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #include <linux/kernel.h> #include <linux/notifier.h> #include <linux/smp.h> #include <linux/oprofile.h> #include <linux/profile.h> #include <linux/init.h> |
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#include <linux/cpu.h> #include <linux/hrtimer.h> #include <asm/irq_regs.h> |
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#include <asm/ptrace.h> #include "oprof.h" |
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static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer); |
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static int ctr_running; |
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static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer) { oprofile_add_sample(get_irq_regs(), 0); hrtimer_forward_now(hrtimer, ns_to_ktime(TICK_NSEC)); return HRTIMER_RESTART; } static void __oprofile_hrtimer_start(void *unused) { struct hrtimer *hrtimer = &__get_cpu_var(oprofile_hrtimer); |
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if (!ctr_running) return; |
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hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); hrtimer->function = oprofile_hrtimer_notify; hrtimer_start(hrtimer, ns_to_ktime(TICK_NSEC), HRTIMER_MODE_REL_PINNED); } static int oprofile_hrtimer_start(void) |
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{ |
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get_online_cpus(); ctr_running = 1; |
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on_each_cpu(__oprofile_hrtimer_start, NULL, 1); |
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put_online_cpus(); |
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return 0; } |
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static void __oprofile_hrtimer_stop(int cpu) |
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{ |
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struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu); |
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if (!ctr_running) return; |
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hrtimer_cancel(hrtimer); |
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} |
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static void oprofile_hrtimer_stop(void) { int cpu; |
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get_online_cpus(); |
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for_each_online_cpu(cpu) __oprofile_hrtimer_stop(cpu); |
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ctr_running = 0; put_online_cpus(); |
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} |
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static int __cpuinit oprofile_cpu_notify(struct notifier_block *self, unsigned long action, void *hcpu) |
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{ |
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long cpu = (long) hcpu; switch (action) { case CPU_ONLINE: case CPU_ONLINE_FROZEN: smp_call_function_single(cpu, __oprofile_hrtimer_start, NULL, 1); break; case CPU_DEAD: case CPU_DEAD_FROZEN: __oprofile_hrtimer_stop(cpu); break; } return NOTIFY_OK; |
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} |
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static struct notifier_block __refdata oprofile_cpu_notifier = { .notifier_call = oprofile_cpu_notify, }; |
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static int oprofile_hrtimer_setup(void) |
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{ |
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return register_hotcpu_notifier(&oprofile_cpu_notifier); |
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} |
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static void oprofile_hrtimer_shutdown(void) |
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{ unregister_hotcpu_notifier(&oprofile_cpu_notifier); |
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} |
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int oprofile_timer_init(struct oprofile_operations *ops) { ops->create_files = NULL; ops->setup = oprofile_hrtimer_setup; ops->shutdown = oprofile_hrtimer_shutdown; ops->start = oprofile_hrtimer_start; ops->stop = oprofile_hrtimer_stop; ops->cpu_type = "timer"; printk(KERN_INFO "oprofile: using timer interrupt. "); return 0; } |