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authorDaniel Bristot de Oliveira <bristot@kernel.org>2022-07-29 12:38:53 +0300
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-07-30 21:01:30 +0300
commitccc319dcb450d57b7befe924453d06804d83ba73 (patch)
tree577ee093d787669d2176cf96d2b9a41f8c33a67b /tools/verification
parent10bde81c74863472047f31304064018c40f488ee (diff)
downloadlinux-ccc319dcb450d57b7befe924453d06804d83ba73.tar.xz
rv/monitor: Add the wwnr monitor
Per task wakeup while not running (wwnr) monitor. 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. Link: https://lkml.kernel.org/r/473c0fc39967250fdebcff8b620311c11dccad30.1659052063.git.bristot@kernel.org Cc: Wim Van Sebroeck <wim@linux-watchdog.org> Cc: Guenter Roeck <linux@roeck-us.net> Cc: Jonathan Corbet <corbet@lwn.net> 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: Tao Zhou <tao.zhou@linux.dev> Cc: Randy Dunlap <rdunlap@infradead.org> 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> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'tools/verification')
-rw-r--r--tools/verification/models/wwnr.dot16
1 files changed, 16 insertions, 0 deletions
diff --git a/tools/verification/models/wwnr.dot b/tools/verification/models/wwnr.dot
new file mode 100644
index 000000000000..1b206e83129c
--- /dev/null
+++ b/tools/verification/models/wwnr.dot
@@ -0,0 +1,16 @@
+digraph state_automaton {
+ {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";
+ }
+}