On Wed, 17 Aug 2016, Peter Zijlstra wrote:
> Hurm.. I never considered using RESET with rdpmc(). The typical usage of
> rdpmc() I considered is something like:
I'm finally trying to hook up PAPI to properly use rdpmc and PAPI likes to
use IOC_RESET in various places. I can just special case to
On Wed, 17 Aug 2016, Peter Zijlstra wrote:
> Hurm.. I never considered using RESET with rdpmc(). The typical usage of
> rdpmc() I considered is something like:
I'm finally trying to hook up PAPI to properly use rdpmc and PAPI likes to
use IOC_RESET in various places. I can just special case to
On Wed, Aug 17, 2016 at 12:53:01AM -0400, Vince Weaver wrote:
> Hello
>
> so using rdpmc() and the mmap page to do fast perf_event reads seems to
> interact poorly with the PERF_EVENT_IOC_RESET ioctl.
Hurm.. I never considered using RESET with rdpmc(). The typical usage of
rdpmc() I considered
On Wed, Aug 17, 2016 at 12:53:01AM -0400, Vince Weaver wrote:
> Hello
>
> so using rdpmc() and the mmap page to do fast perf_event reads seems to
> interact poorly with the PERF_EVENT_IOC_RESET ioctl.
Hurm.. I never considered using RESET with rdpmc(). The typical usage of
rdpmc() I considered
Hello
so using rdpmc() and the mmap page to do fast perf_event reads seems to
interact poorly with the PERF_EVENT_IOC_RESET ioctl.
>From what I can tell, on reset event->count is set to zero, but
event->hw.prev_count is not, so the userpg->offset field ends up negative
and weird things
Hello
so using rdpmc() and the mmap page to do fast perf_event reads seems to
interact poorly with the PERF_EVENT_IOC_RESET ioctl.
>From what I can tell, on reset event->count is set to zero, but
event->hw.prev_count is not, so the userpg->offset field ends up negative
and weird things
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