From: Daniel Bristot de Oliveira <bristot@kernel.org>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: Daniel Bristot de Oliveira <bristot@kernel.org>,
Jonathan Corbet <corbet@lwn.net>, Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
Peter Zijlstra <peterz@infradead.org>,
Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Marco Elver <elver@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
Shuah Khan <skhan@linuxfoundation.org>,
Gabriele Paoloni <gpaoloni@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Clark Williams <williams@redhat.com>,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-trace-devel@vger.kernel.org
Subject: [RFC V2 10/21] rv/monitor: Add the wwnr monitor skeleton created by dot2k
Date: Mon, 14 Feb 2022 11:45:01 +0100 [thread overview]
Message-ID: <57f0c4ed581aab9b4099c9d359259f9dd831cd58.1644830251.git.bristot@kernel.org> (raw)
In-Reply-To: <cover.1644830251.git.bristot@kernel.org>
Per task wakeup while not running (wwnr) monitor, generated by dot2k
with this command line:
$ dot2k -d wwnr.dot -t per_task
The model is:
----- %< -----
digraph state_automaton {
center = true;
size = "7,11";
{node [shape = plaintext, style=invis, label=""] "__init_not_running"};
{node [shape = ellipse] "not_running"};
{node [shape = plaintext] "not_running"};
{node [shape = plaintext] "running"};
"__init_not_running" -> "not_running";
"not_running" [label = "not_running", color = green3];
"not_running" -> "not_running" [ label = "wakeup" ];
"not_running" -> "running" [ label = "switch_in" ];
"running" [label = "running"];
"running" -> "not_running" [ label = "switch_out" ];
{ rank = min ;
"__init_not_running";
"not_running";
}
}
----- >% -----
This model is broken, the reason is that a task can be running in the
processor without being set as RUNNABLE. Think about a task about to
sleep:
1: set_current_state(TASK_UNINTERRUPTIBLE);
2: schedule();
And then imagine an IRQ happening in between the lines one and two,
waking the task up. BOOM, the wakeup will happen while the task is
running.
Q: Why do we need this model, so?
A: To test the reactors.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Gabriele Paoloni <gpaoloni@redhat.com>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Clark Williams <williams@redhat.com>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-trace-devel@vger.kernel.org
Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org>
---
kernel/trace/rv/monitor_wwnr/model.h | 38 ++++++++
kernel/trace/rv/monitor_wwnr/wwnr.c | 127 +++++++++++++++++++++++++++
kernel/trace/rv/monitor_wwnr/wwnr.h | 70 +++++++++++++++
3 files changed, 235 insertions(+)
create mode 100644 kernel/trace/rv/monitor_wwnr/model.h
create mode 100644 kernel/trace/rv/monitor_wwnr/wwnr.c
create mode 100644 kernel/trace/rv/monitor_wwnr/wwnr.h
diff --git a/kernel/trace/rv/monitor_wwnr/model.h b/kernel/trace/rv/monitor_wwnr/model.h
new file mode 100644
index 000000000000..7840ffbda98d
--- /dev/null
+++ b/kernel/trace/rv/monitor_wwnr/model.h
@@ -0,0 +1,38 @@
+enum states_wwnr {
+ not_running = 0,
+ running,
+ state_max
+};
+
+enum events_wwnr {
+ switch_in = 0,
+ switch_out,
+ wakeup,
+ event_max
+};
+
+struct automaton_wwnr {
+ char *state_names[state_max];
+ char *event_names[event_max];
+ char function[state_max][event_max];
+ char initial_state;
+ char final_states[state_max];
+};
+
+struct automaton_wwnr automaton_wwnr = {
+ .state_names = {
+ "not_running",
+ "running"
+ },
+ .event_names = {
+ "switch_in",
+ "switch_out",
+ "wakeup"
+ },
+ .function = {
+ { running, -1, not_running },
+ { -1, not_running, -1 },
+ },
+ .initial_state = not_running,
+ .final_states = { 1, 0 },
+};
\ No newline at end of file
diff --git a/kernel/trace/rv/monitor_wwnr/wwnr.c b/kernel/trace/rv/monitor_wwnr/wwnr.c
new file mode 100644
index 000000000000..91cb3b70a6a7
--- /dev/null
+++ b/kernel/trace/rv/monitor_wwnr/wwnr.c
@@ -0,0 +1,127 @@
+#include <linux/ftrace.h>
+#include <linux/tracepoint.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/rv.h>
+#include <rv/da_monitor.h>
+
+#define MODULE_NAME "wwnr"
+
+/*
+ * This is the self-generated part of the monitor. Generally, there is no need
+ * to touch this section.
+ */
+#include "model.h"
+
+/*
+ * Declare the deterministic automata monitor.
+ *
+ * The rv monitor reference is needed for the monitor declaration.
+ */
+struct rv_monitor rv_wwnr;
+DECLARE_DA_MON_PER_TASK(wwnr, char);
+
+#define CREATE_TRACE_POINTS
+#include "wwnr.h"
+
+/*
+ * This is the instrumentation part of the monitor.
+ *
+ * This is the section where manual work is required. Here the kernel events
+ * are translated into model's event.
+ *
+ */
+
+void handle_switch_in(void *data, /* XXX: fill header */)
+{
+ pid_t pid = /* XXX how do I get the pid? */;
+ da_handle_event_wwnr(pid, switch_in);
+}
+
+void handle_switch_out(void *data, /* XXX: fill header */)
+{
+ pid_t pid = /* XXX how do I get the pid? */;
+ da_handle_event_wwnr(pid, switch_out);
+}
+
+void handle_wakeup(void *data, /* XXX: fill header */)
+{
+ pid_t pid = /* XXX how do I get the pid? */;
+ da_handle_event_wwnr(pid, wakeup);
+}
+
+#define NR_TP 3
+static struct tracepoint_hook_helper tracepoints_to_hook[NR_TP] = {
+ {
+ .probe = handle_switch_in,
+ .name = /* XXX: tracepoint name here */,
+ .registered = 0
+ },
+ {
+ .probe = handle_switch_out,
+ .name = /* XXX: tracepoint name here */,
+ .registered = 0
+ },
+ {
+ .probe = handle_wakeup,
+ .name = /* XXX: tracepoint name here */,
+ .registered = 0
+ },
+};
+
+static int start_wwnr(void)
+{
+ int retval;
+
+ da_monitor_init_wwnr();
+
+ retval = thh_hook_probes(tracepoints_to_hook, NR_TP);
+ if (retval)
+ goto out_err;
+
+ return 0;
+
+out_err:
+ return -EINVAL;
+}
+
+static void stop_wwnr(void)
+{
+ rv_wwnr.enabled = 0;
+ thh_unhook_probes(tracepoints_to_hook, NR_TP);
+ return;
+}
+
+/*
+ * This is the monitor register section.
+ */
+struct rv_monitor rv_wwnr = {
+ .name = "wwnr",
+ .description = "auto-generated wwnr",
+ .start = start_wwnr,
+ .stop = stop_wwnr,
+ .reset = da_monitor_reset_all_wwnr,
+ .enabled = 0,
+};
+
+int register_wwnr(void)
+{
+ rv_register_monitor(&rv_wwnr);
+ return 0;
+}
+
+void unregister_wwnr(void)
+{
+ if (rv_wwnr.enabled)
+ stop_wwnr();
+
+ rv_unregister_monitor(&rv_wwnr);
+}
+
+module_init(register_wwnr);
+module_exit(unregister_wwnr);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("dot2k: auto-generated");
+MODULE_DESCRIPTION("wwnr");
diff --git a/kernel/trace/rv/monitor_wwnr/wwnr.h b/kernel/trace/rv/monitor_wwnr/wwnr.h
new file mode 100644
index 000000000000..4af1827d2f16
--- /dev/null
+++ b/kernel/trace/rv/monitor_wwnr/wwnr.h
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rv
+
+#if !defined(_WWNR_TRACE_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _WWNR_TRACE_H
+
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(event_wwnr,
+
+ TP_PROTO(pid_t pid, char state, char event, char next_state, bool safe),
+
+ TP_ARGS(pid, state, event, next_state, safe),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid )
+ __field( char, state )
+ __field( char, event )
+ __field( char, next_state )
+ __field( bool, safe )
+ ),
+
+ TP_fast_assign(
+ __entry->pid = pid;
+ __entry->state = state;
+ __entry->event = event;
+ __entry->next_state = next_state;
+ __entry->safe = safe;
+ ),
+
+ TP_printk("%d: %s x %s -> %s %s",
+ __entry->pid,
+ model_get_state_name_wwnr(__entry->state),
+ model_get_event_name_wwnr(__entry->event),
+ model_get_state_name_wwnr(__entry->next_state),
+ __entry->safe ? "(safe)" : "")
+);
+
+TRACE_EVENT(error_wwnr,
+
+ TP_PROTO(pid_t pid, char state, char event),
+
+ TP_ARGS(pid, state, event),
+
+ TP_STRUCT__entry(
+ __field( pid_t, pid )
+ __field( char, state )
+ __field( char, event )
+ ),
+
+ TP_fast_assign(
+ __entry->pid = pid;
+ __entry->state = state;
+ __entry->event = event;
+ ),
+
+ TP_printk("%d event %s not expected in the state %s",
+ __entry->pid,
+ model_get_event_name_wwnr(__entry->event),
+ model_get_state_name_wwnr(__entry->state))
+);
+
+#endif /* _WWNR_H */
+
+/* This part ust be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE wwnr
+#include <trace/define_trace.h>
--
2.33.1
next prev parent reply other threads:[~2022-02-14 11:23 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 10:44 [RFC V2 00/21] The Runtime Verification (RV) interface Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 01/21] rv: Add " Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 02/21] rv: Add runtime reactors interface Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 03/21] rv/include: Add helper functions for deterministic automata Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 04/21] rv/include: Add deterministic automata monitor definition via C macros Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 05/21] rv/include: Add tracing helper functions Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 06/21] tools/rv: Add dot2c Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 07/21] tools/rv: Add dot2k Daniel Bristot de Oliveira
2022-02-14 10:44 ` [RFC V2 08/21] rv/monitor: Add the wip monitor skeleton created by dot2k Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 09/21] rv/monitor: wip instrumentation and Makefile/Kconfig entries Daniel Bristot de Oliveira
2022-02-14 10:45 ` Daniel Bristot de Oliveira [this message]
2022-02-14 10:45 ` [RFC V2 11/21] rv/monitor: wwnr " Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 12/21] rv/reactor: Add the printk reactor Daniel Bristot de Oliveira
2022-02-14 17:25 ` Shuah Khan
[not found] ` <c1657d1c-0d2b-4aa3-c1ed-2ae6fdfcda86@kernel.org>
2022-02-15 10:03 ` John Ogness
2022-02-15 12:43 ` Daniel Bristot de Oliveira
2022-02-15 13:33 ` John Ogness
2022-02-15 17:21 ` Daniel Bristot de Oliveira
2022-02-15 19:33 ` John Ogness
2022-02-16 8:58 ` Daniel Bristot de Oliveira
2022-02-16 10:51 ` John Ogness
2022-02-16 13:19 ` Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 13/21] rv/reactor: Add the panic reactor Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 14/21] Documentation/rv: Add a basic documentation Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 15/21] Documentation/rv: Add deterministic automata monitor synthesis documentation Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 16/21] Documentation/rv: Add deterministic automata instrumentation documentation Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 17/21] watchdog/dev: Add tracepoints Daniel Bristot de Oliveira
2022-02-14 14:57 ` Guenter Roeck
2022-02-14 15:39 ` Daniel Bristot de Oliveira
2022-02-16 16:01 ` Peter.Enderborg
2022-02-17 16:27 ` Daniel Bristot de Oliveira
2022-02-17 17:27 ` Guenter Roeck
2022-02-17 17:49 ` Gabriele Paoloni
2022-02-17 17:56 ` Daniel Bristot de Oliveira
2022-02-17 18:17 ` Guenter Roeck
2022-02-17 18:32 ` Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 18/21] rv/monitor: Add safe watchdog monitor Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 19/21] rv/monitor: Add safe watchdog nowayout monitor Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 20/21] rv/safety_app: Add an safety_app sample Daniel Bristot de Oliveira
2022-02-14 10:45 ` [RFC V2 21/21] Documentation/rv: Add watchdog-monitor documentation Daniel Bristot de Oliveira
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