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rv: Add rtapp_sleep monitor 

Add a monitor for checking that real-time tasks do not go to sleep in a
manner that may cause undesirable latency.

Also change
	RV depends on TRACING
to
	RV select TRACING
to avoid the following recursive dependency:

 error: recursive dependency detected!
	symbol TRACING is selected by PREEMPTIRQ_TRACEPOINTS
	symbol PREEMPTIRQ_TRACEPOINTS depends on TRACE_IRQFLAGS
	symbol TRACE_IRQFLAGS is selected by RV_MON_SLEEP
	symbol RV_MON_SLEEP depends on RV
	symbol RV depends on TRACING

Cc: John Ogness <john.ogness@linutronix.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/75bc5bcc741d153aa279c95faf778dff35c5c8ad.1752088709.git.namcao@linutronix.de
Reviewed-by: Gabriele Monaco <gmonaco@redhat.com>
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Nam Cao 2025-07-09 21:21:21 +02:00 committed by Steven Rostedt (Google)
parent 9162620eb6
commit f74f8bb246
8 changed files with 556 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
kernel/trace/rv/Kconfig
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@ -20,7 +20,7 @@ config RV_LTL_MONITOR
menuconfig RV
bool "Runtime Verification"
depends on TRACING
select TRACING
help
Enable the kernel runtime verification infrastructure. RV is a
lightweight (yet rigorous) method that complements classical
@ -43,6 +43,7 @@ source "kernel/trace/rv/monitors/snep/Kconfig"
source "kernel/trace/rv/monitors/sncid/Kconfig"
source "kernel/trace/rv/monitors/rtapp/Kconfig"
source "kernel/trace/rv/monitors/pagefault/Kconfig"
source "kernel/trace/rv/monitors/sleep/Kconfig"
# Add new monitors here
config RV_REACTORS

1
kernel/trace/rv/Makefile
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@ -14,6 +14,7 @@ obj-$(CONFIG_RV_MON_SNEP) += monitors/snep/snep.o
obj-$(CONFIG_RV_MON_SNCID) += monitors/sncid/sncid.o
obj-$(CONFIG_RV_MON_RTAPP) += monitors/rtapp/rtapp.o
obj-$(CONFIG_RV_MON_PAGEFAULT) += monitors/pagefault/pagefault.o
obj-$(CONFIG_RV_MON_SLEEP) += monitors/sleep/sleep.o
# Add new monitors here
obj-$(CONFIG_RV_REACTORS) += rv_reactors.o
obj-$(CONFIG_RV_REACT_PRINTK) += reactor_printk.o

22
kernel/trace/rv/monitors/sleep/Kconfig Normal file
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@ -0,0 +1,22 @@
# SPDX-License-Identifier: GPL-2.0-only
#
config RV_MON_SLEEP
depends on RV
select RV_LTL_MONITOR
depends on HAVE_SYSCALL_TRACEPOINTS
depends on RV_MON_RTAPP
select TRACE_IRQFLAGS
default y
select LTL_MON_EVENTS_ID
bool "sleep monitor"
help
Monitor that real-time tasks do not sleep in a manner that may
cause undesirable latency.
If you are developing a real-time system and not entirely sure whether
the applications are designed correctly for real-time, you want to say
Y here.
Enabling this monitor may have performance impact (due to select
TRACE_IRQFLAGS). Therefore, you probably should say N for
production kernel.

237
kernel/trace/rv/monitors/sleep/sleep.c Normal file
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@ -0,0 +1,237 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/ftrace.h>
#include <linux/tracepoint.h>
#include <linux/init.h>
#include <linux/irqflags.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rv.h>
#include <linux/sched/deadline.h>
#include <linux/sched/rt.h>
#include <rv/instrumentation.h>
#define MODULE_NAME "sleep"
#include <trace/events/syscalls.h>
#include <trace/events/sched.h>
#include <trace/events/lock.h>
#include <uapi/linux/futex.h>
#include <rv_trace.h>
#include <monitors/rtapp/rtapp.h>
#include "sleep.h"
#include <rv/ltl_monitor.h>
static void ltl_atoms_fetch(struct task_struct *task, struct ltl_monitor *mon)
{
/*
* This includes "actual" real-time tasks and also PI-boosted
* tasks. A task being PI-boosted means it is blocking an "actual"
* real-task, therefore it should also obey the monitor's rule,
* otherwise the "actual" real-task may be delayed.
*/
ltl_atom_set(mon, LTL_RT, rt_or_dl_task(task));
}
static void ltl_atoms_init(struct task_struct *task, struct ltl_monitor *mon, bool task_creation)
{
ltl_atom_set(mon, LTL_SLEEP, false);
ltl_atom_set(mon, LTL_WAKE, false);
ltl_atom_set(mon, LTL_ABORT_SLEEP, false);
ltl_atom_set(mon, LTL_WOKEN_BY_HARDIRQ, false);
ltl_atom_set(mon, LTL_WOKEN_BY_NMI, false);
ltl_atom_set(mon, LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, false);
if (task_creation) {
ltl_atom_set(mon, LTL_KTHREAD_SHOULD_STOP, false);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_MONOTONIC, false);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_TAI, false);
ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, false);
ltl_atom_set(mon, LTL_CLOCK_NANOSLEEP, false);
ltl_atom_set(mon, LTL_FUTEX_WAIT, false);
ltl_atom_set(mon, LTL_FUTEX_LOCK_PI, false);
ltl_atom_set(mon, LTL_BLOCK_ON_RT_MUTEX, false);
}
if (task->flags & PF_KTHREAD) {
ltl_atom_set(mon, LTL_KERNEL_THREAD, true);
/* kernel tasks do not do syscall */
ltl_atom_set(mon, LTL_FUTEX_WAIT, false);
ltl_atom_set(mon, LTL_FUTEX_LOCK_PI, false);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_MONOTONIC, false);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_TAI, false);
ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, false);
ltl_atom_set(mon, LTL_CLOCK_NANOSLEEP, false);
if (strstarts(task->comm, "migration/"))
ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, true);
else
ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, false);
if (strstarts(task->comm, "rcu"))
ltl_atom_set(mon, LTL_TASK_IS_RCU, true);
else
ltl_atom_set(mon, LTL_TASK_IS_RCU, false);
} else {
ltl_atom_set(mon, LTL_KTHREAD_SHOULD_STOP, false);
ltl_atom_set(mon, LTL_KERNEL_THREAD, false);
ltl_atom_set(mon, LTL_TASK_IS_RCU, false);
ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, false);
}
}
static void handle_sched_set_state(void *data, struct task_struct *task, int state)
{
if (state & TASK_INTERRUPTIBLE)
ltl_atom_pulse(task, LTL_SLEEP, true);
else if (state == TASK_RUNNING)
ltl_atom_pulse(task, LTL_ABORT_SLEEP, true);
}
static void handle_sched_wakeup(void *data, struct task_struct *task)
{
ltl_atom_pulse(task, LTL_WAKE, true);
}
static void handle_sched_waking(void *data, struct task_struct *task)
{
if (this_cpu_read(hardirq_context)) {
ltl_atom_pulse(task, LTL_WOKEN_BY_HARDIRQ, true);
} else if (in_task()) {
if (current->prio <= task->prio)
ltl_atom_pulse(task, LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, true);
} else if (in_nmi()) {
ltl_atom_pulse(task, LTL_WOKEN_BY_NMI, true);
}
}
static void handle_contention_begin(void *data, void *lock, unsigned int flags)
{
if (flags & LCB_F_RT)
ltl_atom_update(current, LTL_BLOCK_ON_RT_MUTEX, true);
}
static void handle_contention_end(void *data, void *lock, int ret)
{
ltl_atom_update(current, LTL_BLOCK_ON_RT_MUTEX, false);
}
static void handle_sys_enter(void *data, struct pt_regs *regs, long id)
{
struct ltl_monitor *mon;
unsigned long args[6];
int op, cmd;
mon = ltl_get_monitor(current);
switch (id) {
case __NR_clock_nanosleep:
#ifdef __NR_clock_nanosleep_time64
case __NR_clock_nanosleep_time64:
#endif
syscall_get_arguments(current, regs, args);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_MONOTONIC, args[0] == CLOCK_MONOTONIC);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_TAI, args[0] == CLOCK_TAI);
ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, args[1] == TIMER_ABSTIME);
ltl_atom_update(current, LTL_CLOCK_NANOSLEEP, true);
break;
case __NR_futex:
#ifdef __NR_futex_time64
case __NR_futex_time64:
#endif
syscall_get_arguments(current, regs, args);
op = args[1];
cmd = op & FUTEX_CMD_MASK;
switch (cmd) {
case FUTEX_LOCK_PI:
case FUTEX_LOCK_PI2:
ltl_atom_update(current, LTL_FUTEX_LOCK_PI, true);
break;
case FUTEX_WAIT:
case FUTEX_WAIT_BITSET:
case FUTEX_WAIT_REQUEUE_PI:
ltl_atom_update(current, LTL_FUTEX_WAIT, true);
break;
}
break;
}
}
static void handle_sys_exit(void *data, struct pt_regs *regs, long ret)
{
struct ltl_monitor *mon = ltl_get_monitor(current);
ltl_atom_set(mon, LTL_FUTEX_LOCK_PI, false);
ltl_atom_set(mon, LTL_FUTEX_WAIT, false);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_MONOTONIC, false);
ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_TAI, false);
ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, false);
ltl_atom_update(current, LTL_CLOCK_NANOSLEEP, false);
}
static void handle_kthread_stop(void *data, struct task_struct *task)
{
/* FIXME: this could race with other tracepoint handlers */
ltl_atom_update(task, LTL_KTHREAD_SHOULD_STOP, true);
}
static int enable_sleep(void)
{
int retval;
retval = ltl_monitor_init();
if (retval)
return retval;
rv_attach_trace_probe("rtapp_sleep", sched_waking, handle_sched_waking);
rv_attach_trace_probe("rtapp_sleep", sched_wakeup, handle_sched_wakeup);
rv_attach_trace_probe("rtapp_sleep", sched_set_state_tp, handle_sched_set_state);
rv_attach_trace_probe("rtapp_sleep", contention_begin, handle_contention_begin);
rv_attach_trace_probe("rtapp_sleep", contention_end, handle_contention_end);
rv_attach_trace_probe("rtapp_sleep", sched_kthread_stop, handle_kthread_stop);
rv_attach_trace_probe("rtapp_sleep", sys_enter, handle_sys_enter);
rv_attach_trace_probe("rtapp_sleep", sys_exit, handle_sys_exit);
return 0;
}
static void disable_sleep(void)
{
rv_detach_trace_probe("rtapp_sleep", sched_waking, handle_sched_waking);
rv_detach_trace_probe("rtapp_sleep", sched_wakeup, handle_sched_wakeup);
rv_detach_trace_probe("rtapp_sleep", sched_set_state_tp, handle_sched_set_state);
rv_detach_trace_probe("rtapp_sleep", contention_begin, handle_contention_begin);
rv_detach_trace_probe("rtapp_sleep", contention_end, handle_contention_end);
rv_detach_trace_probe("rtapp_sleep", sched_kthread_stop, handle_kthread_stop);
rv_detach_trace_probe("rtapp_sleep", sys_enter, handle_sys_enter);
rv_detach_trace_probe("rtapp_sleep", sys_exit, handle_sys_exit);
ltl_monitor_destroy();
}
static struct rv_monitor rv_sleep = {
.name = "sleep",
.description = "Monitor that RT tasks do not undesirably sleep",
.enable = enable_sleep,
.disable = disable_sleep,
};
static int __init register_sleep(void)
{
return rv_register_monitor(&rv_sleep, &rv_rtapp);
}
static void __exit unregister_sleep(void)
{
rv_unregister_monitor(&rv_sleep);
}
module_init(register_sleep);
module_exit(unregister_sleep);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Nam Cao <namcao@linutronix.de>");
MODULE_DESCRIPTION("sleep: Monitor that RT tasks do not undesirably sleep");

257
kernel/trace/rv/monitors/sleep/sleep.h Normal file
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@ -0,0 +1,257 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* C implementation of Buchi automaton, automatically generated by
* tools/verification/rvgen from the linear temporal logic specification.
* For further information, see kernel documentation:
* Documentation/trace/rv/linear_temporal_logic.rst
*/
#include <linux/rv.h>
#define MONITOR_NAME sleep
enum ltl_atom {
LTL_ABORT_SLEEP,
LTL_BLOCK_ON_RT_MUTEX,
LTL_CLOCK_NANOSLEEP,
LTL_FUTEX_LOCK_PI,
LTL_FUTEX_WAIT,
LTL_KERNEL_THREAD,
LTL_KTHREAD_SHOULD_STOP,
LTL_NANOSLEEP_CLOCK_MONOTONIC,
LTL_NANOSLEEP_CLOCK_TAI,
LTL_NANOSLEEP_TIMER_ABSTIME,
LTL_RT,
LTL_SLEEP,
LTL_TASK_IS_MIGRATION,
LTL_TASK_IS_RCU,
LTL_WAKE,
LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO,
LTL_WOKEN_BY_HARDIRQ,
LTL_WOKEN_BY_NMI,
LTL_NUM_ATOM
};
static_assert(LTL_NUM_ATOM <= RV_MAX_LTL_ATOM);
static const char *ltl_atom_str(enum ltl_atom atom)
{
static const char *const names[] = {
"ab_sl",
"bl_on_rt_mu",
"cl_na",
"fu_lo_pi",
"fu_wa",
"ker_th",
"kth_sh_st",
"na_cl_mo",
"na_cl_ta",
"na_ti_ab",
"rt",
"sl",
"ta_mi",
"ta_rc",
"wak",
"wo_eq_hi_pr",
"wo_ha",
"wo_nm",
};
return names[atom];
}
enum ltl_buchi_state {
S0,
S1,
S2,
S3,
S4,
S5,
S6,
S7,
RV_NUM_BA_STATES
};
static_assert(RV_NUM_BA_STATES <= RV_MAX_BA_STATES);
static void ltl_start(struct task_struct *task, struct ltl_monitor *mon)
{
bool task_is_migration = test_bit(LTL_TASK_IS_MIGRATION, mon->atoms);
bool task_is_rcu = test_bit(LTL_TASK_IS_RCU, mon->atoms);
bool val40 = task_is_rcu || task_is_migration;
bool futex_lock_pi = test_bit(LTL_FUTEX_LOCK_PI, mon->atoms);
bool val41 = futex_lock_pi || val40;
bool block_on_rt_mutex = test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms);
bool val5 = block_on_rt_mutex || val41;
bool kthread_should_stop = test_bit(LTL_KTHREAD_SHOULD_STOP, mon->atoms);
bool abort_sleep = test_bit(LTL_ABORT_SLEEP, mon->atoms);
bool val32 = abort_sleep || kthread_should_stop;
bool woken_by_nmi = test_bit(LTL_WOKEN_BY_NMI, mon->atoms);
bool val33 = woken_by_nmi || val32;
bool woken_by_hardirq = test_bit(LTL_WOKEN_BY_HARDIRQ, mon->atoms);
bool val34 = woken_by_hardirq || val33;
bool woken_by_equal_or_higher_prio = test_bit(LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO,
mon->atoms);
bool val14 = woken_by_equal_or_higher_prio || val34;
bool wake = test_bit(LTL_WAKE, mon->atoms);
bool val13 = !wake;
bool kernel_thread = test_bit(LTL_KERNEL_THREAD, mon->atoms);
bool nanosleep_clock_tai = test_bit(LTL_NANOSLEEP_CLOCK_TAI, mon->atoms);
bool nanosleep_clock_monotonic = test_bit(LTL_NANOSLEEP_CLOCK_MONOTONIC, mon->atoms);
bool val24 = nanosleep_clock_monotonic || nanosleep_clock_tai;
bool nanosleep_timer_abstime = test_bit(LTL_NANOSLEEP_TIMER_ABSTIME, mon->atoms);
bool val25 = nanosleep_timer_abstime && val24;
bool clock_nanosleep = test_bit(LTL_CLOCK_NANOSLEEP, mon->atoms);
bool val18 = clock_nanosleep && val25;
bool futex_wait = test_bit(LTL_FUTEX_WAIT, mon->atoms);
bool val9 = futex_wait || val18;
bool val11 = val9 || kernel_thread;
bool sleep = test_bit(LTL_SLEEP, mon->atoms);
bool val2 = !sleep;
bool rt = test_bit(LTL_RT, mon->atoms);
bool val1 = !rt;
bool val3 = val1 || val2;
if (val3)
__set_bit(S0, mon->states);
if (val11 && val13)
__set_bit(S1, mon->states);
if (val11 && val14)
__set_bit(S4, mon->states);
if (val5)
__set_bit(S5, mon->states);
}
static void
ltl_possible_next_states(struct ltl_monitor *mon, unsigned int state, unsigned long *next)
{
bool task_is_migration = test_bit(LTL_TASK_IS_MIGRATION, mon->atoms);
bool task_is_rcu = test_bit(LTL_TASK_IS_RCU, mon->atoms);
bool val40 = task_is_rcu || task_is_migration;
bool futex_lock_pi = test_bit(LTL_FUTEX_LOCK_PI, mon->atoms);
bool val41 = futex_lock_pi || val40;
bool block_on_rt_mutex = test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms);
bool val5 = block_on_rt_mutex || val41;
bool kthread_should_stop = test_bit(LTL_KTHREAD_SHOULD_STOP, mon->atoms);
bool abort_sleep = test_bit(LTL_ABORT_SLEEP, mon->atoms);
bool val32 = abort_sleep || kthread_should_stop;
bool woken_by_nmi = test_bit(LTL_WOKEN_BY_NMI, mon->atoms);
bool val33 = woken_by_nmi || val32;
bool woken_by_hardirq = test_bit(LTL_WOKEN_BY_HARDIRQ, mon->atoms);
bool val34 = woken_by_hardirq || val33;
bool woken_by_equal_or_higher_prio = test_bit(LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO,
mon->atoms);
bool val14 = woken_by_equal_or_higher_prio || val34;
bool wake = test_bit(LTL_WAKE, mon->atoms);
bool val13 = !wake;
bool kernel_thread = test_bit(LTL_KERNEL_THREAD, mon->atoms);
bool nanosleep_clock_tai = test_bit(LTL_NANOSLEEP_CLOCK_TAI, mon->atoms);
bool nanosleep_clock_monotonic = test_bit(LTL_NANOSLEEP_CLOCK_MONOTONIC, mon->atoms);
bool val24 = nanosleep_clock_monotonic || nanosleep_clock_tai;
bool nanosleep_timer_abstime = test_bit(LTL_NANOSLEEP_TIMER_ABSTIME, mon->atoms);
bool val25 = nanosleep_timer_abstime && val24;
bool clock_nanosleep = test_bit(LTL_CLOCK_NANOSLEEP, mon->atoms);
bool val18 = clock_nanosleep && val25;
bool futex_wait = test_bit(LTL_FUTEX_WAIT, mon->atoms);
bool val9 = futex_wait || val18;
bool val11 = val9 || kernel_thread;
bool sleep = test_bit(LTL_SLEEP, mon->atoms);
bool val2 = !sleep;
bool rt = test_bit(LTL_RT, mon->atoms);
bool val1 = !rt;
bool val3 = val1 || val2;
switch (state) {
case S0:
if (val3)
__set_bit(S0, next);
if (val11 && val13)
__set_bit(S1, next);
if (val11 && val14)
__set_bit(S4, next);
if (val5)
__set_bit(S5, next);
break;
case S1:
if (val11 && val13)
__set_bit(S1, next);
if (val13 && val3)
__set_bit(S2, next);
if (val14 && val3)
__set_bit(S3, next);
if (val11 && val14)
__set_bit(S4, next);
if (val13 && val5)
__set_bit(S6, next);
if (val14 && val5)
__set_bit(S7, next);
break;
case S2:
if (val11 && val13)
__set_bit(S1, next);
if (val13 && val3)
__set_bit(S2, next);
if (val14 && val3)
__set_bit(S3, next);
if (val11 && val14)
__set_bit(S4, next);
if (val13 && val5)
__set_bit(S6, next);
if (val14 && val5)
__set_bit(S7, next);
break;
case S3:
if (val3)
__set_bit(S0, next);
if (val11 && val13)
__set_bit(S1, next);
if (val11 && val14)
__set_bit(S4, next);
if (val5)
__set_bit(S5, next);
break;
case S4:
if (val3)
__set_bit(S0, next);
if (val11 && val13)
__set_bit(S1, next);
if (val11 && val14)
__set_bit(S4, next);
if (val5)
__set_bit(S5, next);
break;
case S5:
if (val3)
__set_bit(S0, next);
if (val11 && val13)
__set_bit(S1, next);
if (val11 && val14)
__set_bit(S4, next);
if (val5)
__set_bit(S5, next);
break;
case S6:
if (val11 && val13)
__set_bit(S1, next);
if (val13 && val3)
__set_bit(S2, next);
if (val14 && val3)
__set_bit(S3, next);
if (val11 && val14)
__set_bit(S4, next);
if (val13 && val5)
__set_bit(S6, next);
if (val14 && val5)
__set_bit(S7, next);
break;
case S7:
if (val3)
__set_bit(S0, next);
if (val11 && val13)
__set_bit(S1, next);
if (val11 && val14)
__set_bit(S4, next);
if (val5)
__set_bit(S5, next);
break;
}
}

14
kernel/trace/rv/monitors/sleep/sleep_trace.h Normal file
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@ -0,0 +1,14 @@
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Snippet to be included in rv_trace.h
*/
#ifdef CONFIG_RV_MON_SLEEP
DEFINE_EVENT(event_ltl_monitor_id, event_sleep,
TP_PROTO(struct task_struct *task, char *states, char *atoms, char *next),
TP_ARGS(task, states, atoms, next));
DEFINE_EVENT(error_ltl_monitor_id, error_sleep,
TP_PROTO(struct task_struct *task),
TP_ARGS(task));
#endif /* CONFIG_RV_MON_SLEEP */

1
kernel/trace/rv/rv_trace.h
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@ -173,6 +173,7 @@ DECLARE_EVENT_CLASS(error_ltl_monitor_id,
TP_printk("%s[%d]: violation detected", __get_str(comm), __entry->pid)
);
#include <monitors/pagefault/pagefault_trace.h>
#include <monitors/sleep/sleep_trace.h>
// Add new monitors based on CONFIG_LTL_MON_EVENTS_ID here
#endif /* CONFIG_LTL_MON_EVENTS_ID */
#endif /* _TRACE_RV_H */

22
tools/verification/models/rtapp/sleep.ltl Normal file
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@ -0,0 +1,22 @@
RULE = always ((RT and SLEEP) imply (RT_FRIENDLY_SLEEP or ALLOWLIST))
RT_FRIENDLY_SLEEP = (RT_VALID_SLEEP_REASON or KERNEL_THREAD)
and ((not WAKE) until RT_FRIENDLY_WAKE)
RT_VALID_SLEEP_REASON = FUTEX_WAIT
or RT_FRIENDLY_NANOSLEEP
RT_FRIENDLY_NANOSLEEP = CLOCK_NANOSLEEP
and NANOSLEEP_TIMER_ABSTIME
and (NANOSLEEP_CLOCK_MONOTONIC or NANOSLEEP_CLOCK_TAI)
RT_FRIENDLY_WAKE = WOKEN_BY_EQUAL_OR_HIGHER_PRIO
or WOKEN_BY_HARDIRQ
or WOKEN_BY_NMI
or ABORT_SLEEP
or KTHREAD_SHOULD_STOP
ALLOWLIST = BLOCK_ON_RT_MUTEX
or FUTEX_LOCK_PI
or TASK_IS_RCU
or TASK_IS_MIGRATION