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102 lines
2.2 KiB
102 lines
2.2 KiB
/* |
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* trace context switch |
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* |
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* Copyright (C) 2007 Steven Rostedt <[email protected]> |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/kallsyms.h> |
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#include <linux/uaccess.h> |
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#include <linux/ftrace.h> |
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#include <trace/events/sched.h> |
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#include "trace.h" |
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static int sched_ref; |
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static DEFINE_MUTEX(sched_register_mutex); |
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static void |
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probe_sched_switch(void *ignore, bool preempt, |
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struct task_struct *prev, struct task_struct *next) |
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{ |
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if (unlikely(!sched_ref)) |
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return; |
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tracing_record_cmdline(prev); |
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tracing_record_cmdline(next); |
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} |
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static void |
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probe_sched_wakeup(void *ignore, struct task_struct *wakee) |
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{ |
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if (unlikely(!sched_ref)) |
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return; |
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tracing_record_cmdline(current); |
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} |
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static int tracing_sched_register(void) |
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{ |
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int ret; |
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ret = register_trace_sched_wakeup(probe_sched_wakeup, NULL); |
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if (ret) { |
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pr_info("wakeup trace: Couldn't activate tracepoint" |
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" probe to kernel_sched_wakeup\n"); |
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return ret; |
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} |
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ret = register_trace_sched_wakeup_new(probe_sched_wakeup, NULL); |
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if (ret) { |
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pr_info("wakeup trace: Couldn't activate tracepoint" |
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" probe to kernel_sched_wakeup_new\n"); |
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goto fail_deprobe; |
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} |
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ret = register_trace_sched_switch(probe_sched_switch, NULL); |
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if (ret) { |
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pr_info("sched trace: Couldn't activate tracepoint" |
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" probe to kernel_sched_switch\n"); |
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goto fail_deprobe_wake_new; |
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} |
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return ret; |
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fail_deprobe_wake_new: |
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unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL); |
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fail_deprobe: |
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unregister_trace_sched_wakeup(probe_sched_wakeup, NULL); |
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return ret; |
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} |
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static void tracing_sched_unregister(void) |
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{ |
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unregister_trace_sched_switch(probe_sched_switch, NULL); |
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unregister_trace_sched_wakeup_new(probe_sched_wakeup, NULL); |
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unregister_trace_sched_wakeup(probe_sched_wakeup, NULL); |
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} |
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static void tracing_start_sched_switch(void) |
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{ |
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mutex_lock(&sched_register_mutex); |
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if (!(sched_ref++)) |
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tracing_sched_register(); |
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mutex_unlock(&sched_register_mutex); |
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} |
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static void tracing_stop_sched_switch(void) |
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{ |
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mutex_lock(&sched_register_mutex); |
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if (!(--sched_ref)) |
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tracing_sched_unregister(); |
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mutex_unlock(&sched_register_mutex); |
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} |
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void tracing_start_cmdline_record(void) |
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{ |
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tracing_start_sched_switch(); |
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} |
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void tracing_stop_cmdline_record(void) |
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{ |
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tracing_stop_sched_switch(); |
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}
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