Re: [patch 0/3] [Announcement] Performance Counters for Linux

Andi Kleen
2008-12-10T10:51:38Z

On Wed, Dec 10, 2008 at 07:23:36PM +0900, Paul Mundt wrote:
> On Wed, Dec 10, 2008 at 11:28:19AM +0100, Andi Kleen wrote:
> > > Oprofile has been a pretty bad fit for them, and while I'm slightly more
> >
> > You could always use a extension of timer mode that reads them
> > periodically?
> >
> This is what I do today, but it is not an ideal solution. It would be
> nice if these sorts of use cases could be supported by newer frameworks
> without every platform with similar requirements having to implement
> workarounds hanging off of the timer IRQ.

But you shouldn't hang off the timer irq anyways, but better use a regular
timer or hr timer. This would give more regular sampling even with dyntick.
And doing such a timer is only a few lines of code, I'm not sure it would
buy you all that much to generalize it.

-Andi

--
ak@linux.intel.com