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e8440a88e5
Add 2 per-task monitors as part of the sched model:
* nrp: need-resched preempts
Monitor to ensure preemption requires need resched.
* sssw: set state sleep and wakeup
Monitor to ensure sched_set_state to sleepable leads to sleeping and
sleeping tasks require wakeup.
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: Juri Lelli <jlelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/20250728135022.255578-9-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Acked-by: Nam Cao <namcao@linutronix.de>
Tested-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ftrace.h>
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#include <linux/tracepoint.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/rv.h>
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#include <rv/instrumentation.h>
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#include <rv/da_monitor.h>
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#define MODULE_NAME "sssw"
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#include <trace/events/sched.h>
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#include <trace/events/signal.h>
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#include <rv_trace.h>
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#include <monitors/sched/sched.h>
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#include "sssw.h"
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static struct rv_monitor rv_sssw;
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DECLARE_DA_MON_PER_TASK(sssw, unsigned char);
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static void handle_sched_set_state(void *data, struct task_struct *tsk, int state)
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{
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if (state == TASK_RUNNING)
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da_handle_start_event_sssw(tsk, sched_set_state_runnable_sssw);
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else
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da_handle_event_sssw(tsk, sched_set_state_sleepable_sssw);
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}
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static void handle_sched_switch(void *data, bool preempt,
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struct task_struct *prev,
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struct task_struct *next,
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unsigned int prev_state)
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{
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if (preempt)
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da_handle_event_sssw(prev, sched_switch_preempt_sssw);
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else if (prev_state == TASK_RUNNING)
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da_handle_event_sssw(prev, sched_switch_yield_sssw);
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else if (prev_state == TASK_RTLOCK_WAIT)
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/* special case of sleeping task with racy conditions */
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da_handle_event_sssw(prev, sched_switch_blocking_sssw);
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else
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da_handle_event_sssw(prev, sched_switch_suspend_sssw);
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da_handle_event_sssw(next, sched_switch_in_sssw);
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}
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static void handle_sched_wakeup(void *data, struct task_struct *p)
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{
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/*
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* Wakeup can also lead to signal_wakeup although the system is
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* actually runnable. The monitor can safely start with this event.
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*/
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da_handle_start_event_sssw(p, sched_wakeup_sssw);
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}
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static void handle_signal_deliver(void *data, int sig,
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struct kernel_siginfo *info,
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struct k_sigaction *ka)
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{
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da_handle_event_sssw(current, signal_deliver_sssw);
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}
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static int enable_sssw(void)
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{
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int retval;
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retval = da_monitor_init_sssw();
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if (retval)
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return retval;
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rv_attach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
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rv_attach_trace_probe("sssw", sched_switch, handle_sched_switch);
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rv_attach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
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rv_attach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
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return 0;
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}
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static void disable_sssw(void)
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{
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rv_sssw.enabled = 0;
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rv_detach_trace_probe("sssw", sched_set_state_tp, handle_sched_set_state);
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rv_detach_trace_probe("sssw", sched_switch, handle_sched_switch);
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rv_detach_trace_probe("sssw", sched_wakeup, handle_sched_wakeup);
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rv_detach_trace_probe("sssw", signal_deliver, handle_signal_deliver);
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da_monitor_destroy_sssw();
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}
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static struct rv_monitor rv_sssw = {
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.name = "sssw",
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.description = "set state sleep and wakeup.",
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.enable = enable_sssw,
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.disable = disable_sssw,
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.reset = da_monitor_reset_all_sssw,
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.enabled = 0,
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};
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static int __init register_sssw(void)
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{
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return rv_register_monitor(&rv_sssw, &rv_sched);
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}
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static void __exit unregister_sssw(void)
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{
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rv_unregister_monitor(&rv_sssw);
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}
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module_init(register_sssw);
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module_exit(unregister_sssw);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
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MODULE_DESCRIPTION("sssw: set state sleep and wakeup.");
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