process wakeups

[Ulrich Drepper]

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Daniel P. Berrange wrote:
>>   uid | poll select  epoll itimer  futex nanosle signal| process
>>  2397 |   16      0      0      0      0       0      0| libvirtd
> 
> This isn't libvirtd's fault - we don't use any timeouts, and only
> break out of poll() if there's real work todo.

The script counts returns from poll() where no file descriptor is ready.
 This is no count of all poll() calls.

Note, that all calls in a process regardless of whether it's in the
binary or a DSO is counted.

Of course there could be a problem with systemtap but I doubt it
actually, the script is simple.

- --
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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