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Re: probe when thread is queued
On 02/05/2013 02:33 PM, Mehul Choube wrote:
> stap -e 'probe scheduler.cpu_off { if (task_prev->state == 0) { printf ("pid %d queued\n", task_prev->pid); } }'
The way stap works, the convenience variables have no type information.
Add the type information back with the @cast operator. So, all your
'task_prev' references would look like '@cast(task_prev, "task_struct")'.
Here's the whole thing (somewhat mangled by my mailer):
# stap -v -e 'probe scheduler.cpu_off { if (@cast(task_prev,
"task_struct")->state == 0) { printf ("pid %d queued\n",
@cast(task_prev, "task_struct")->pid); } }'
--
David Smith
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Red Hat
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