From: Peter Zijlstra <peterz@infradead.org>
To: Marco Elver <elver@google.com>
Cc: alexander.shishkin@linux.intel.com, acme@kernel.org,
mingo@redhat.com, jolsa@redhat.com, mark.rutland@arm.com,
namhyung@kernel.org, tglx@linutronix.de, glider@google.com,
viro@zeniv.linux.org.uk, arnd@arndb.de, christian@brauner.io,
dvyukov@google.com, jannh@google.com, axboe@kernel.dk,
mascasa@google.com, pcc@google.com, irogers@google.com,
kasan-dev@googlegroups.com, linux-arch@vger.kernel.org,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
x86@kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v3 07/11] perf: Add breakpoint information to siginfo on SIGTRAP
Date: Wed, 24 Mar 2021 15:00:18 +0100 [thread overview]
Message-ID: <YFtF8tEPHrXnw7cX@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <YFtB+Ta9pkMg4C2h@hirez.programming.kicks-ass.net>
One last try, I'll leave it alone now, I promise :-)
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -778,6 +778,9 @@ struct perf_event {
void *security;
#endif
struct list_head sb_list;
+
+ unsigned long si_uattr;
+ unsigned long si_data;
#endif /* CONFIG_PERF_EVENTS */
};
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5652,13 +5652,17 @@ static long _perf_ioctl(struct perf_even
return perf_event_query_prog_array(event, (void __user *)arg);
case PERF_EVENT_IOC_MODIFY_ATTRIBUTES: {
+ struct perf_event_attr __user *uattr;
struct perf_event_attr new_attr;
- int err = perf_copy_attr((struct perf_event_attr __user *)arg,
- &new_attr);
+ int err;
+ uattr = (struct perf_event_attr __user *)arg;
+ err = perf_copy_attr(uattr, &new_attr);
if (err)
return err;
+ event->si_uattr = (unsigned long)uattr;
+
return perf_event_modify_attr(event, &new_attr);
}
default:
@@ -6399,7 +6403,12 @@ static void perf_sigtrap(struct perf_eve
clear_siginfo(&info);
info.si_signo = SIGTRAP;
info.si_code = TRAP_PERF;
- info.si_errno = event->attr.type;
+ info.si_addr = (void *)event->si_data;
+
+ info.si_perf = event->si_uattr;
+ if (event->parent)
+ info.si_perf = event->parent->si_uattr;
+
force_sig_info(&info);
}
@@ -6414,8 +6423,8 @@ static void perf_pending_event_disable(s
WRITE_ONCE(event->pending_disable, -1);
if (event->attr.sigtrap) {
- atomic_set(&event->event_limit, 1); /* rearm event */
perf_sigtrap(event);
+ atomic_set_release(&event->event_limit, 1); /* rearm event */
return;
}
@@ -9121,6 +9130,7 @@ static int __perf_event_overflow(struct
if (events && atomic_dec_and_test(&event->event_limit)) {
ret = 1;
event->pending_kill = POLL_HUP;
+ event->si_data = data->addr;
perf_event_disable_inatomic(event);
}
@@ -12011,6 +12021,8 @@ SYSCALL_DEFINE5(perf_event_open,
goto err_task;
}
+ event->si_uattr = (unsigned long)attr_uptr;
+
if (is_sampling_event(event)) {
if (event->pmu->capabilities & PERF_PMU_CAP_NO_INTERRUPT) {
err = -EOPNOTSUPP;
next prev parent reply other threads:[~2021-03-24 14:02 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-24 11:24 [PATCH v3 00/11] Add support for synchronous signals on perf events Marco Elver
2021-03-24 11:24 ` [PATCH v3 01/11] perf: Rework perf_event_exit_event() Marco Elver
2021-03-25 10:17 ` Marco Elver
2021-03-25 16:17 ` Marco Elver
2021-03-25 19:10 ` Marco Elver
2021-03-29 11:50 ` Peter Zijlstra
2021-03-24 11:24 ` [PATCH v3 02/11] perf: Apply PERF_EVENT_IOC_MODIFY_ATTRIBUTES to children Marco Elver
2021-03-24 11:24 ` [PATCH v3 03/11] perf: Support only inheriting events if cloned with CLONE_THREAD Marco Elver
2021-03-24 11:24 ` [PATCH v3 04/11] perf: Add support for event removal on exec Marco Elver
2021-03-24 11:24 ` [PATCH v3 05/11] signal: Introduce TRAP_PERF si_code and si_perf to siginfo Marco Elver
2021-03-24 11:24 ` [PATCH v3 06/11] perf: Add support for SIGTRAP on perf events Marco Elver
2021-03-25 8:14 ` Marco Elver
2021-03-29 12:07 ` Peter Zijlstra
2021-03-29 14:27 ` Oleg Nesterov
2021-03-29 14:32 ` Marco Elver
2021-03-30 7:04 ` Peter Zijlstra
2021-03-29 18:22 ` Marco Elver
2021-03-29 18:33 ` Oleg Nesterov
2021-03-31 12:32 ` Marco Elver
2021-03-31 14:51 ` Peter Zijlstra
2021-03-31 16:50 ` Marco Elver
2021-03-24 11:24 ` [PATCH v3 07/11] perf: Add breakpoint information to siginfo on SIGTRAP Marco Elver
2021-03-24 12:53 ` Peter Zijlstra
2021-03-24 13:01 ` Peter Zijlstra
2021-03-24 13:21 ` Peter Zijlstra
2021-03-24 13:43 ` Peter Zijlstra
2021-03-24 14:00 ` Peter Zijlstra [this message]
2021-03-24 14:05 ` Marco Elver
2021-03-24 14:12 ` Dmitry Vyukov
2021-03-24 14:15 ` Dmitry Vyukov
2021-03-25 7:00 ` Marco Elver
2021-03-25 14:18 ` Ingo Molnar
2021-03-25 15:17 ` Marco Elver
2021-03-25 15:35 ` Ingo Molnar
2021-03-24 13:47 ` Marco Elver
2021-03-24 11:25 ` [PATCH v3 08/11] selftests/perf_events: Add kselftest for process-wide sigtrap handling Marco Elver
2021-03-24 11:25 ` [PATCH v3 09/11] selftests/perf_events: Add kselftest for remove_on_exec Marco Elver
2021-03-24 11:25 ` [PATCH v3 10/11] tools headers uapi: Sync tools/include/uapi/linux/perf_event.h Marco Elver
2021-03-24 11:25 ` [PATCH v3 11/11] perf test: Add basic stress test for sigtrap handling Marco Elver
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