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[212.8.243.115]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887e81a2cesm38045435e9.8.2026.03.31.05.50.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Mar 2026 05:50:33 -0700 (PDT) Message-ID: <4b47d5e7e9dde0c76beb1a9383a13553c2455d92.camel@redhat.com> Subject: Re: [PATCH] rv: Allow epoll in rtapp-sleep monitor From: Gabriele Monaco To: Nam Cao Cc: Steven Rostedt , linux-trace-kernel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Tue, 31 Mar 2026 14:50:31 +0200 In-Reply-To: <20260331104918.2710853-1-namcao@linutronix.de> References: <20260331104918.2710853-1-namcao@linutronix.de> Autocrypt: addr=gmonaco@redhat.com; prefer-encrypt=mutual; keydata=mDMEZuK5YxYJKwYBBAHaRw8BAQdAmJ3dM9Sz6/Hodu33Qrf8QH2bNeNbOikqYtxWFLVm0 1a0JEdhYnJpZWxlIE1vbmFjbyA8Z21vbmFjb0BrZXJuZWwub3JnPoiZBBMWCgBBFiEEysoR+AuB3R Zwp6j270psSVh4TfIFAmjKX2MCGwMFCQWjmoAFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4AACgk Q70psSVh4TfIQuAD+JulczTN6l7oJjyroySU55Fbjdvo52xiYYlMjPG7dCTsBAMFI7dSL5zg98I+8 cXY1J7kyNsY6/dcipqBM4RMaxXsOtCRHYWJyaWVsZSBNb25hY28gPGdtb25hY29AcmVkaGF0LmNvb T6InAQTFgoARAIbAwUJBaOagAULCQgHAgIiAgYVCgkICwIEFgIDAQIeBwIXgBYhBMrKEfgLgd0WcK eo9u9KbElYeE3yBQJoymCyAhkBAAoJEO9KbElYeE3yjX4BAJ/ETNnlHn8OjZPT77xGmal9kbT1bC1 7DfrYVISWV2Y1AP9HdAMhWNAvtCtN2S1beYjNybuK6IzWYcFfeOV+OBWRDQ== Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.58.3 (3.58.3-1.fc43) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Tue, 2026-03-31 at 12:49 +0200, Nam Cao wrote: > Since commit 0c43094f8cc9 ("eventpoll: Replace rwlock with spinlock"), > epoll_wait is real-time-safe syscall for sleeping. >=20 > Add epoll_wait to the list of rt-safe sleeping APIs. >=20 > Signed-off-by: Nam Cao Thanks for the patch, looks reasonable. I tried re-generating the header (sleep.h) with rvgen based on the new specification and I'm getting a different order. Is what you're committing the result of rvgen on your computer? We probably still have some unpredictable result in the rvgen's output if t= hat's the case (no big deal then, though it triggers me a bit). I would still like to run some tests on this, how urgently would you like t= his patch through? I was really about to send Steve a PR with the other changes= so this might need to wait for the next merge window. Thanks, Gabriele > --- > =C2=A0kernel/trace/rv/monitors/sleep/sleep.c=C2=A0=C2=A0=C2=A0 |=C2=A0 8 = ++ > =C2=A0kernel/trace/rv/monitors/sleep/sleep.h=C2=A0=C2=A0=C2=A0 | 98 +++++= +++++++----------- > =C2=A0tools/verification/models/rtapp/sleep.ltl |=C2=A0 1 + > =C2=A03 files changed, 61 insertions(+), 46 deletions(-) >=20 > diff --git a/kernel/trace/rv/monitors/sleep/sleep.c > b/kernel/trace/rv/monitors/sleep/sleep.c > index c1347da69e9d..59091863c17c 100644 > --- a/kernel/trace/rv/monitors/sleep/sleep.c > +++ b/kernel/trace/rv/monitors/sleep/sleep.c > @@ -49,6 +49,7 @@ static void ltl_atoms_init(struct task_struct *task, st= ruct > ltl_monitor *mon, bo > =C2=A0 ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, false); > =C2=A0 ltl_atom_set(mon, LTL_CLOCK_NANOSLEEP, false); > =C2=A0 ltl_atom_set(mon, LTL_FUTEX_WAIT, false); > + ltl_atom_set(mon, LTL_EPOLL_WAIT, false); > =C2=A0 ltl_atom_set(mon, LTL_FUTEX_LOCK_PI, false); > =C2=A0 ltl_atom_set(mon, LTL_BLOCK_ON_RT_MUTEX, false); > =C2=A0 } > @@ -63,6 +64,7 @@ static void ltl_atoms_init(struct task_struct *task, st= ruct > ltl_monitor *mon, bo > =C2=A0 ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_TAI, false); > =C2=A0 ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, false); > =C2=A0 ltl_atom_set(mon, LTL_CLOCK_NANOSLEEP, false); > + ltl_atom_set(mon, LTL_EPOLL_WAIT, false); > =C2=A0 > =C2=A0 if (strstarts(task->comm, "migration/")) > =C2=A0 ltl_atom_set(mon, LTL_TASK_IS_MIGRATION, true); > @@ -162,6 +164,11 @@ static void handle_sys_enter(void *data, struct pt_r= egs > *regs, long id) > =C2=A0 break; > =C2=A0 } > =C2=A0 break; > +#ifdef __NR_epoll_wait > + case __NR_epoll_wait: > + ltl_atom_set(mon, LTL_EPOLL_WAIT, true); > + break; > +#endif > =C2=A0 } > =C2=A0} > =C2=A0 > @@ -174,6 +181,7 @@ static void handle_sys_exit(void *data, struct pt_reg= s > *regs, long ret) > =C2=A0 ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_MONOTONIC, false); > =C2=A0 ltl_atom_set(mon, LTL_NANOSLEEP_CLOCK_TAI, false); > =C2=A0 ltl_atom_set(mon, LTL_NANOSLEEP_TIMER_ABSTIME, false); > + ltl_atom_set(mon, LTL_EPOLL_WAIT, false); > =C2=A0 ltl_atom_update(current, LTL_CLOCK_NANOSLEEP, false); > =C2=A0} > =C2=A0 > diff --git a/kernel/trace/rv/monitors/sleep/sleep.h > b/kernel/trace/rv/monitors/sleep/sleep.h > index 2ab46fd218d2..95dc2727c059 100644 > --- a/kernel/trace/rv/monitors/sleep/sleep.h > +++ b/kernel/trace/rv/monitors/sleep/sleep.h > @@ -15,6 +15,7 @@ enum ltl_atom { > =C2=A0 LTL_ABORT_SLEEP, > =C2=A0 LTL_BLOCK_ON_RT_MUTEX, > =C2=A0 LTL_CLOCK_NANOSLEEP, > + LTL_EPOLL_WAIT, > =C2=A0 LTL_FUTEX_LOCK_PI, > =C2=A0 LTL_FUTEX_WAIT, > =C2=A0 LTL_KERNEL_THREAD, > @@ -40,6 +41,7 @@ static const char *ltl_atom_str(enum ltl_atom atom) > =C2=A0 "ab_sl", > =C2=A0 "bl_on_rt_mu", > =C2=A0 "cl_na", > + "ep_wa", > =C2=A0 "fu_lo_pi", > =C2=A0 "fu_wa", > =C2=A0 "ker_th", > @@ -75,39 +77,41 @@ static_assert(RV_NUM_BA_STATES <=3D RV_MAX_BA_STATES)= ; > =C2=A0 > =C2=A0static void ltl_start(struct task_struct *task, struct ltl_monitor = *mon) > =C2=A0{ > - bool task_is_migration =3D test_bit(LTL_TASK_IS_MIGRATION, mon->atoms); > - bool task_is_rcu =3D test_bit(LTL_TASK_IS_RCU, mon->atoms); > - bool val40 =3D task_is_rcu || task_is_migration; > - bool futex_lock_pi =3D test_bit(LTL_FUTEX_LOCK_PI, mon->atoms); > - bool val41 =3D futex_lock_pi || val40; > - bool block_on_rt_mutex =3D test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms); > - bool val5 =3D block_on_rt_mutex || val41; > - bool kthread_should_stop =3D test_bit(LTL_KTHREAD_SHOULD_STOP, mon- > >atoms); > - bool abort_sleep =3D test_bit(LTL_ABORT_SLEEP, mon->atoms); > - bool val32 =3D abort_sleep || kthread_should_stop; > =C2=A0 bool woken_by_nmi =3D test_bit(LTL_WOKEN_BY_NMI, mon->atoms); > - bool val33 =3D woken_by_nmi || val32; > =C2=A0 bool woken_by_hardirq =3D test_bit(LTL_WOKEN_BY_HARDIRQ, mon->atom= s); > - bool val34 =3D woken_by_hardirq || val33; > =C2=A0 bool woken_by_equal_or_higher_prio =3D > test_bit(LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 mon->atoms); > - bool val14 =3D woken_by_equal_or_higher_prio || val34; > =C2=A0 bool wake =3D test_bit(LTL_WAKE, mon->atoms); > - bool val13 =3D !wake; > - bool kernel_thread =3D test_bit(LTL_KERNEL_THREAD, mon->atoms); > + bool task_is_rcu =3D test_bit(LTL_TASK_IS_RCU, mon->atoms); > + bool task_is_migration =3D test_bit(LTL_TASK_IS_MIGRATION, mon->atoms); > + bool sleep =3D test_bit(LTL_SLEEP, mon->atoms); > + bool rt =3D test_bit(LTL_RT, mon->atoms); > + bool nanosleep_timer_abstime =3D test_bit(LTL_NANOSLEEP_TIMER_ABSTIME, > mon->atoms); > =C2=A0 bool nanosleep_clock_tai =3D test_bit(LTL_NANOSLEEP_CLOCK_TAI, mon= - > >atoms); > =C2=A0 bool nanosleep_clock_monotonic =3D > test_bit(LTL_NANOSLEEP_CLOCK_MONOTONIC, mon->atoms); > - bool val24 =3D nanosleep_clock_monotonic || nanosleep_clock_tai; > - bool nanosleep_timer_abstime =3D test_bit(LTL_NANOSLEEP_TIMER_ABSTIME, > mon->atoms); > - bool val25 =3D nanosleep_timer_abstime && val24; > - bool clock_nanosleep =3D test_bit(LTL_CLOCK_NANOSLEEP, mon->atoms); > - bool val18 =3D clock_nanosleep && val25; > + bool kthread_should_stop =3D test_bit(LTL_KTHREAD_SHOULD_STOP, mon- > >atoms); > + bool kernel_thread =3D test_bit(LTL_KERNEL_THREAD, mon->atoms); > =C2=A0 bool futex_wait =3D test_bit(LTL_FUTEX_WAIT, mon->atoms); > - bool val9 =3D futex_wait || val18; > + bool futex_lock_pi =3D test_bit(LTL_FUTEX_LOCK_PI, mon->atoms); > + bool epoll_wait =3D test_bit(LTL_EPOLL_WAIT, mon->atoms); > + bool clock_nanosleep =3D test_bit(LTL_CLOCK_NANOSLEEP, mon->atoms); > + bool block_on_rt_mutex =3D test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms); > + bool abort_sleep =3D test_bit(LTL_ABORT_SLEEP, mon->atoms); > + bool val42 =3D task_is_rcu || task_is_migration; > + bool val43 =3D futex_lock_pi || val42; > + bool val5 =3D block_on_rt_mutex || val43; > + bool val34 =3D abort_sleep || kthread_should_stop; > + bool val35 =3D woken_by_nmi || val34; > + bool val36 =3D woken_by_hardirq || val35; > + bool val14 =3D woken_by_equal_or_higher_prio || val36; > + bool val13 =3D !wake; > + bool val26 =3D nanosleep_clock_monotonic || nanosleep_clock_tai; > + bool val27 =3D nanosleep_timer_abstime && val26; > + bool val18 =3D clock_nanosleep && val27; > + bool val20 =3D val18 || epoll_wait; > + bool val9 =3D futex_wait || val20; > =C2=A0 bool val11 =3D val9 || kernel_thread; > - bool sleep =3D test_bit(LTL_SLEEP, mon->atoms); > =C2=A0 bool val2 =3D !sleep; > - bool rt =3D test_bit(LTL_RT, mon->atoms); > =C2=A0 bool val1 =3D !rt; > =C2=A0 bool val3 =3D val1 || val2; > =C2=A0 > @@ -124,39 +128,41 @@ static void ltl_start(struct task_struct *task, str= uct > ltl_monitor *mon) > =C2=A0static void > =C2=A0ltl_possible_next_states(struct ltl_monitor *mon, unsigned int stat= e, > unsigned long *next) > =C2=A0{ > - bool task_is_migration =3D test_bit(LTL_TASK_IS_MIGRATION, mon->atoms); > - bool task_is_rcu =3D test_bit(LTL_TASK_IS_RCU, mon->atoms); > - bool val40 =3D task_is_rcu || task_is_migration; > - bool futex_lock_pi =3D test_bit(LTL_FUTEX_LOCK_PI, mon->atoms); > - bool val41 =3D futex_lock_pi || val40; > - bool block_on_rt_mutex =3D test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms); > - bool val5 =3D block_on_rt_mutex || val41; > - bool kthread_should_stop =3D test_bit(LTL_KTHREAD_SHOULD_STOP, mon- > >atoms); > - bool abort_sleep =3D test_bit(LTL_ABORT_SLEEP, mon->atoms); > - bool val32 =3D abort_sleep || kthread_should_stop; > =C2=A0 bool woken_by_nmi =3D test_bit(LTL_WOKEN_BY_NMI, mon->atoms); > - bool val33 =3D woken_by_nmi || val32; > =C2=A0 bool woken_by_hardirq =3D test_bit(LTL_WOKEN_BY_HARDIRQ, mon->atom= s); > - bool val34 =3D woken_by_hardirq || val33; > =C2=A0 bool woken_by_equal_or_higher_prio =3D > test_bit(LTL_WOKEN_BY_EQUAL_OR_HIGHER_PRIO, > =C2=A0 =C2=A0=C2=A0=C2=A0=C2=A0 mon->atoms); > - bool val14 =3D woken_by_equal_or_higher_prio || val34; > =C2=A0 bool wake =3D test_bit(LTL_WAKE, mon->atoms); > - bool val13 =3D !wake; > - bool kernel_thread =3D test_bit(LTL_KERNEL_THREAD, mon->atoms); > + bool task_is_rcu =3D test_bit(LTL_TASK_IS_RCU, mon->atoms); > + bool task_is_migration =3D test_bit(LTL_TASK_IS_MIGRATION, mon->atoms); > + bool sleep =3D test_bit(LTL_SLEEP, mon->atoms); > + bool rt =3D test_bit(LTL_RT, mon->atoms); > + bool nanosleep_timer_abstime =3D test_bit(LTL_NANOSLEEP_TIMER_ABSTIME, > mon->atoms); > =C2=A0 bool nanosleep_clock_tai =3D test_bit(LTL_NANOSLEEP_CLOCK_TAI, mon= - > >atoms); > =C2=A0 bool nanosleep_clock_monotonic =3D > test_bit(LTL_NANOSLEEP_CLOCK_MONOTONIC, mon->atoms); > - bool val24 =3D nanosleep_clock_monotonic || nanosleep_clock_tai; > - bool nanosleep_timer_abstime =3D test_bit(LTL_NANOSLEEP_TIMER_ABSTIME, > mon->atoms); > - bool val25 =3D nanosleep_timer_abstime && val24; > - bool clock_nanosleep =3D test_bit(LTL_CLOCK_NANOSLEEP, mon->atoms); > - bool val18 =3D clock_nanosleep && val25; > + bool kthread_should_stop =3D test_bit(LTL_KTHREAD_SHOULD_STOP, mon- > >atoms); > + bool kernel_thread =3D test_bit(LTL_KERNEL_THREAD, mon->atoms); > =C2=A0 bool futex_wait =3D test_bit(LTL_FUTEX_WAIT, mon->atoms); > - bool val9 =3D futex_wait || val18; > + bool futex_lock_pi =3D test_bit(LTL_FUTEX_LOCK_PI, mon->atoms); > + bool epoll_wait =3D test_bit(LTL_EPOLL_WAIT, mon->atoms); > + bool clock_nanosleep =3D test_bit(LTL_CLOCK_NANOSLEEP, mon->atoms); > + bool block_on_rt_mutex =3D test_bit(LTL_BLOCK_ON_RT_MUTEX, mon->atoms); > + bool abort_sleep =3D test_bit(LTL_ABORT_SLEEP, mon->atoms); > + bool val42 =3D task_is_rcu || task_is_migration; > + bool val43 =3D futex_lock_pi || val42; > + bool val5 =3D block_on_rt_mutex || val43; > + bool val34 =3D abort_sleep || kthread_should_stop; > + bool val35 =3D woken_by_nmi || val34; > + bool val36 =3D woken_by_hardirq || val35; > + bool val14 =3D woken_by_equal_or_higher_prio || val36; > + bool val13 =3D !wake; > + bool val26 =3D nanosleep_clock_monotonic || nanosleep_clock_tai; > + bool val27 =3D nanosleep_timer_abstime && val26; > + bool val18 =3D clock_nanosleep && val27; > + bool val20 =3D val18 || epoll_wait; > + bool val9 =3D futex_wait || val20; > =C2=A0 bool val11 =3D val9 || kernel_thread; > - bool sleep =3D test_bit(LTL_SLEEP, mon->atoms); > =C2=A0 bool val2 =3D !sleep; > - bool rt =3D test_bit(LTL_RT, mon->atoms); > =C2=A0 bool val1 =3D !rt; > =C2=A0 bool val3 =3D val1 || val2; > =C2=A0 > diff --git a/tools/verification/models/rtapp/sleep.ltl > b/tools/verification/models/rtapp/sleep.ltl > index 6379bbeb6212..6f26c4810f78 100644 > --- a/tools/verification/models/rtapp/sleep.ltl > +++ b/tools/verification/models/rtapp/sleep.ltl > @@ -5,6 +5,7 @@ RT_FRIENDLY_SLEEP =3D (RT_VALID_SLEEP_REASON or KERNEL_TH= READ) > =C2=A0 > =C2=A0RT_VALID_SLEEP_REASON =3D FUTEX_WAIT > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 or RT_FRIENDLY_NANOS= LEEP > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 or EPOLL_WAIT > =C2=A0 > =C2=A0RT_FRIENDLY_NANOSLEEP =3D CLOCK_NANOSLEEP > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 and NANOSLEEP_TIMER_ABSTIM= E