Hi Rafael,
Rafael.Vanoni wrote:
> Here's a patch to identify the function causing a xcall. Here's an
> example output of the change this introduces:
>
> from
>
> sched : <cross calls>
>
> to
>
> sched : <cross call> unix`dtrace_xcall_func
>
>
> I'm not sure whether this should be the default option or only for -v.
> So please let me know what you think.
>
> Thanks,
> Rafael
I saw this patch in the powertop repo.
Previously, the cross call number on my idle system is:
=============
Wakeups-from-idle per second: 1621.6 interval: 5.0s
Top causes for wakeups:
76.1% (1234.3) sched :<cross calls>
--------snip--------
0.9% ( 14.0) dtrace :<cross calls>
============
with this patch, the number decreased too much, see below:
==============
Wakeups-from-idle per second: 1592.7 interval: 5.0s
Top causes for wakeups:
11.2% (178.8) sched :<cross call> unix`dtrace_xcall_func
----snip----
1.0% ( 16.0) dtrace :<cross call> unix`dtrace_xcall_func
==============
I believe the actual cross call shouldn't vary too much in idle.
Any thoughts?
Thanks,
-Aubrey
