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149 lines
3.1 KiB
149 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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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#define RECORD_CMDLINE 1 |
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#define RECORD_TGID 2 |
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static int sched_cmdline_ref; |
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static int sched_tgid_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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int flags; |
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flags = (RECORD_TGID * !!sched_tgid_ref) + |
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(RECORD_CMDLINE * !!sched_cmdline_ref); |
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if (!flags) |
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return; |
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tracing_record_taskinfo_sched_switch(prev, next, flags); |
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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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int flags; |
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flags = (RECORD_TGID * !!sched_tgid_ref) + |
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(RECORD_CMDLINE * !!sched_cmdline_ref); |
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if (!flags) |
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return; |
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tracing_record_taskinfo(current, flags); |
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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(int ops) |
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{ |
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bool sched_register; |
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mutex_lock(&sched_register_mutex); |
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sched_register = (!sched_cmdline_ref && !sched_tgid_ref); |
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switch (ops) { |
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case RECORD_CMDLINE: |
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sched_cmdline_ref++; |
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break; |
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case RECORD_TGID: |
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sched_tgid_ref++; |
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break; |
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} |
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if (sched_register && (sched_cmdline_ref || sched_tgid_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(int ops) |
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{ |
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mutex_lock(&sched_register_mutex); |
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switch (ops) { |
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case RECORD_CMDLINE: |
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sched_cmdline_ref--; |
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break; |
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case RECORD_TGID: |
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sched_tgid_ref--; |
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break; |
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} |
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if (!sched_cmdline_ref && !sched_tgid_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(RECORD_CMDLINE); |
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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(RECORD_CMDLINE); |
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} |
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void tracing_start_tgid_record(void) |
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{ |
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tracing_start_sched_switch(RECORD_TGID); |
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} |
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void tracing_stop_tgid_record(void) |
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{ |
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tracing_stop_sched_switch(RECORD_TGID); |
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}
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