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// SPDX-License-Identifier: GPL-2.0
#include <linux/ftrace.h>
#include <linux/tracepoint.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/rv.h>
#include <rv/instrumentation.h>
#include <rv/da_monitor.h>
#define MODULE_NAME "sssw"
#include <trace/events/sched.h>
#include <trace/events/signal.h>
#include <rv_trace.h>
#include <monitors/sched/sched.h>
#include "sssw.h"
static struct rv_monitor rv_sssw;
DECLARE_DA_MON_PER_TASK(sssw, unsigned char);
static void handle_sched_set_state(void *data, struct task_struct *tsk, int state)
{
if (state == TASK_RUNNING)
da_handle_start_event_sssw(tsk, sched_set_state_runnable_sssw);
else
da_handle_event_sssw(tsk, sched_set_state_sleepable_sssw);
}
static void handle_sched_switch(void *data, bool preempt,
struct task_struct *prev,
struct task_struct *next,
unsigned int prev_state)
{
if (preempt)
da_handle_event_sssw(prev, sched_switch_preempt_sssw);
else if (prev_state == TASK_RUNNING)
da_handle_event_sssw(prev, sched_switch_yield_sssw);
else if (prev_state == TASK_RTLOCK_WAIT)
/* special case of sleeping task with racy conditions */
da_handle_event_sssw(prev, sched_switch_blocking_sssw);
else
da_handle_event_sssw(prev, sched_switch_suspend_sssw);
da_handle_event_sssw(next, sched_switch_in_sssw);
}
static void handle_sched_wakeup(void *data, struct task_struct *p)
{
/*
* Wakeup can also lead to signal_wakeup although the system is
* actually runnable. The monitor can safely start with this event.
*/
da_handle_start_event_sssw(p, sched_wakeup_sssw);
}
static void handle_signal_deliver(void *data, int sig,
struct kernel_siginfo *info,
struct k_sigaction *ka)
{
da_handle_event_sssw(current, signal_deliver_sssw);
}
static int enable_sssw(void)
{
int retval;
retval = da_monitor_init_sssw();
if (retval)
return retval;
rv_attach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
rv_attach_trace_probe("sssw", sched_switch, handle_sched_switch);
rv_attach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
rv_attach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
return 0;
}
static void disable_sssw(void)
{
rv_sssw.enabled = 0;
rv_detach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
rv_detach_trace_probe("sssw", sched_switch, handle_sched_switch);
rv_detach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
rv_detach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
da_monitor_destroy_sssw();
}
static struct rv_monitor rv_sssw = {
.name = "sssw",
.description = "set state sleep and wakeup.",
.enable = enable_sssw,
.disable = disable_sssw,
.reset = da_monitor_reset_all_sssw,
.enabled = 0,
};
static int __init register_sssw(void)
{
return rv_register_monitor(&rv_sssw, &rv_sched);
}
static void __exit unregister_sssw(void)
{
rv_unregister_monitor(&rv_sssw);
}
module_init(register_sssw);
module_exit(unregister_sssw);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
MODULE_DESCRIPTION("sssw: set state sleep and wakeup.");
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