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drivers/oprofile/oprof.c
5.04 KB
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/** * @file oprof.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> #include <linux/oprofile.h> #include <linux/moduleparam.h> |
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#include <linux/workqueue.h> #include <linux/time.h> |
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#include <linux/mutex.h> |
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#include "oprof.h" #include "event_buffer.h" #include "cpu_buffer.h" #include "buffer_sync.h" #include "oprofile_stats.h" |
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struct oprofile_operations oprofile_ops; unsigned long oprofile_started; |
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unsigned long oprofile_backtrace_depth; |
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static unsigned long is_setup; static DEFINE_MUTEX(start_mutex); |
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/* timer 0 - use performance monitoring hardware if available 1 - use the timer int mechanism regardless */ static int timer = 0; int oprofile_setup(void) { int err; |
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mutex_lock(&start_mutex); |
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if ((err = alloc_cpu_buffers())) goto out; if ((err = alloc_event_buffer())) goto out1; |
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if (oprofile_ops.setup && (err = oprofile_ops.setup())) goto out2; |
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/* Note even though this starts part of the * profiling overhead, it's necessary to prevent * us missing task deaths and eventually oopsing * when trying to process the event buffer. */ |
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if (oprofile_ops.sync_start) { int sync_ret = oprofile_ops.sync_start(); switch (sync_ret) { case 0: goto post_sync; case 1: goto do_generic; case -1: goto out3; default: goto out3; } } do_generic: |
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if ((err = sync_start())) goto out3; |
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post_sync: |
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is_setup = 1; |
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mutex_unlock(&start_mutex); |
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return 0; |
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out3: if (oprofile_ops.shutdown) oprofile_ops.shutdown(); out2: free_event_buffer(); out1: free_cpu_buffers(); out: |
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mutex_unlock(&start_mutex); |
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return err; } |
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#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX |
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static void switch_worker(struct work_struct *work); static DECLARE_DELAYED_WORK(switch_work, switch_worker); |
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static void start_switch_worker(void) { |
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if (oprofile_ops.switch_events) schedule_delayed_work(&switch_work, oprofile_time_slice); } static void stop_switch_worker(void) { cancel_delayed_work_sync(&switch_work); |
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} static void switch_worker(struct work_struct *work) { |
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if (oprofile_ops.switch_events()) return; atomic_inc(&oprofile_stats.multiplex_counter); start_switch_worker(); |
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} |
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/* User inputs in ms, converts to jiffies */ int oprofile_set_timeout(unsigned long val_msec) { int err = 0; unsigned long time_slice; mutex_lock(&start_mutex); if (oprofile_started) { err = -EBUSY; goto out; } if (!oprofile_ops.switch_events) { err = -EINVAL; goto out; } time_slice = msecs_to_jiffies(val_msec); if (time_slice == MAX_JIFFY_OFFSET) { err = -EINVAL; goto out; } oprofile_time_slice = time_slice; out: mutex_unlock(&start_mutex); return err; } #else static inline void start_switch_worker(void) { } static inline void stop_switch_worker(void) { } |
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#endif |
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/* Actually start profiling (echo 1>/dev/oprofile/enable) */ int oprofile_start(void) { int err = -EINVAL; |
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mutex_lock(&start_mutex); |
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if (!is_setup) goto out; |
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err = 0; |
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if (oprofile_started) goto out; |
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oprofile_reset_stats(); if ((err = oprofile_ops.start())) goto out; |
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start_switch_worker(); |
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oprofile_started = 1; out: |
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mutex_unlock(&start_mutex); |
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return err; } |
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/* echo 0>/dev/oprofile/enable */ void oprofile_stop(void) { |
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mutex_lock(&start_mutex); |
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if (!oprofile_started) goto out; oprofile_ops.stop(); oprofile_started = 0; |
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stop_switch_worker(); |
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/* wake up the daemon to read what remains */ wake_up_buffer_waiter(); out: |
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mutex_unlock(&start_mutex); |
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} void oprofile_shutdown(void) { |
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mutex_lock(&start_mutex); |
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if (oprofile_ops.sync_stop) { int sync_ret = oprofile_ops.sync_stop(); switch (sync_ret) { case 0: goto post_sync; case 1: goto do_generic; default: goto post_sync; } } do_generic: |
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sync_stop(); |
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post_sync: |
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if (oprofile_ops.shutdown) oprofile_ops.shutdown(); is_setup = 0; free_event_buffer(); free_cpu_buffers(); |
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mutex_unlock(&start_mutex); |
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} |
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int oprofile_set_ulong(unsigned long *addr, unsigned long val) |
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{ |
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int err = -EBUSY; |
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mutex_lock(&start_mutex); |
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if (!oprofile_started) { *addr = val; err = 0; |
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} |
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mutex_unlock(&start_mutex); |
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return err; } |
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static int timer_mode; |
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static int __init oprofile_init(void) { int err; |
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/* always init architecture to setup backtrace support */ |
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timer_mode = 0; |
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err = oprofile_arch_init(&oprofile_ops); |
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if (!err) { if (!timer && !oprofilefs_register()) return 0; oprofile_arch_exit(); } |
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/* setup timer mode: */ timer_mode = 1; /* no nmi timer mode if oprofile.timer is set */ if (timer || op_nmi_timer_init(&oprofile_ops)) { |
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err = oprofile_timer_init(&oprofile_ops); if (err) |
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return err; |
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} |
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return oprofilefs_register(); |
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} static void __exit oprofile_exit(void) { oprofilefs_unregister(); |
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if (!timer_mode) |
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oprofile_arch_exit(); |
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} |
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module_init(oprofile_init); module_exit(oprofile_exit); module_param_named(timer, timer, int, 0644); MODULE_PARM_DESC(timer, "force use of timer interrupt"); |
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MODULE_LICENSE("GPL"); MODULE_AUTHOR("John Levon <levon@movementarian.org>"); MODULE_DESCRIPTION("OProfile system profiler"); |