mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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adcc3bfa88
Add the following tracepoint:
* sched_set_need_resched(tsk, cpu, tif)
Called when a task is set the need resched [lazy] flag
Remove the unused ip parameter from sched_entry and sched_exit and alter
sched_entry to have a value of preempt consistent with the one used in
sched_switch.
Also adapt all monitors using sched_{entry,exit} to avoid breaking build.
These tracepoints are useful to describe the Linux task model and are
adapted from the patches by Daniel Bristot de Oliveira
(https://bristot.me/linux-task-model/).
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Nam Cao <namcao@linutronix.de>
Cc: Tomas Glozar <tglozar@redhat.com>
Cc: Juri Lelli <jlelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
Link: https://lore.kernel.org/20250728135022.255578-7-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
96 lines
2.3 KiB
C
96 lines
2.3 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 "scpd"
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#include <trace/events/sched.h>
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#include <trace/events/preemptirq.h>
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#include <rv_trace.h>
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#include <monitors/sched/sched.h>
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#include "scpd.h"
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static struct rv_monitor rv_scpd;
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DECLARE_DA_MON_PER_CPU(scpd, unsigned char);
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static void handle_preempt_disable(void *data, unsigned long ip, unsigned long parent_ip)
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{
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da_handle_event_scpd(preempt_disable_scpd);
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}
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static void handle_preempt_enable(void *data, unsigned long ip, unsigned long parent_ip)
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{
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da_handle_start_event_scpd(preempt_enable_scpd);
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}
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static void handle_schedule_entry(void *data, bool preempt)
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{
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da_handle_event_scpd(schedule_entry_scpd);
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}
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static void handle_schedule_exit(void *data, bool is_switch)
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{
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da_handle_event_scpd(schedule_exit_scpd);
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}
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static int enable_scpd(void)
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{
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int retval;
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retval = da_monitor_init_scpd();
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if (retval)
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return retval;
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rv_attach_trace_probe("scpd", preempt_disable, handle_preempt_disable);
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rv_attach_trace_probe("scpd", preempt_enable, handle_preempt_enable);
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rv_attach_trace_probe("scpd", sched_entry_tp, handle_schedule_entry);
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rv_attach_trace_probe("scpd", sched_exit_tp, handle_schedule_exit);
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return 0;
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}
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static void disable_scpd(void)
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{
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rv_scpd.enabled = 0;
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rv_detach_trace_probe("scpd", preempt_disable, handle_preempt_disable);
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rv_detach_trace_probe("scpd", preempt_enable, handle_preempt_enable);
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rv_detach_trace_probe("scpd", sched_entry_tp, handle_schedule_entry);
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rv_detach_trace_probe("scpd", sched_exit_tp, handle_schedule_exit);
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da_monitor_destroy_scpd();
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}
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static struct rv_monitor rv_scpd = {
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.name = "scpd",
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.description = "schedule called with preemption disabled.",
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.enable = enable_scpd,
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.disable = disable_scpd,
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.reset = da_monitor_reset_all_scpd,
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.enabled = 0,
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};
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static int __init register_scpd(void)
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{
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return rv_register_monitor(&rv_scpd, &rv_sched);
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}
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static void __exit unregister_scpd(void)
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{
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rv_unregister_monitor(&rv_scpd);
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}
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module_init(register_scpd);
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module_exit(unregister_scpd);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Gabriele Monaco <gmonaco@redhat.com>");
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MODULE_DESCRIPTION("scpd: schedule called with preemption disabled.");
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