diff options
| author | Daniel Bristot de Oliveira <[email protected]> | 2022-07-29 11:38:53 +0200 |
|---|---|---|
| committer | Steven Rostedt (Google) <[email protected]> | 2022-07-30 14:01:30 -0400 |
| commit | ccc319dcb450d57b7befe924453d06804d83ba73 (patch) | |
| tree | 577ee093d787669d2176cf96d2b9a41f8c33a67b /tools | |
| parent | 10bde81c74863472047f31304064018c40f488ee (diff) | |
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 <[email protected]>
Cc: Guenter Roeck <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: "Paul E. McKenney" <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Gabriele Paoloni <[email protected]>
Cc: Juri Lelli <[email protected]>
Cc: Clark Williams <[email protected]>
Cc: Tao Zhou <[email protected]>
Cc: Randy Dunlap <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Daniel Bristot de Oliveira <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/verification/models/wwnr.dot | 16 |
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"; + } +} |