| |
|
 |
|
 |
|
|
|
| |
|
|
xen-devel
Re: [Xen-devel] [PATCH] remove blocked time accounting from xen "clockc
On 10/19/11 09:51, Jan Beulich wrote:
On 18.10.11 at 22:42, Laszlo Ersek<lersek@xxxxxxxxxx> wrote:
... because the "clock_event_device framework" already accounts for idle
time through the "event_handler" function pointer in
xen_timer_interrupt().
As event_handler is being checked to be non-zero, shouldn't the
code you remove simply become conditional (upon event_handler
being zero)?
I think that wouldn't be hard to implement, but I'm afraid the paragraph
you quoted from my proposed commit message could be wrong -- perhaps
it's not the event_handler callback that cranks the idle time counter.
Please see
https://bugzilla.redhat.com/show_bug.cgi?id=624756#c26
In short,
(a) idle time is increased in cpu_idle(), which seems to be running as a
standalone kernel thread;
(b) the event_handler I found invoked from xen_timer_interrupt() is
hrtimer_interrupt();
(c) I couldn't figure out if cpu_idle() keeps waking up "on its own", or
if it needs periodic kicks from hrtimer_interrupt() (executed by some
other thread).
Thank you
Laszlo
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel
|
|
|
| |
|
Home