Messages in this thread | | | Date | Wed, 28 Mar 2012 17:02:49 +0800 | From | "Yan, Zheng" <> | Subject | Re: [RFC PATCH 0/5] perf: Intel uncore pmu counting support |
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On 03/28/2012 04:49 PM, Peter Zijlstra wrote: > On Wed, 2012-03-28 at 08:49 +0200, Ingo Molnar wrote: >> * Yan, Zheng <zheng.z.yan@intel.com> wrote: >> >>> Hi, all >>> >>> Here is the RFC patches to add uncore counting support for Nehalem, >>> Sandy Bridge and Sandy Bridge-EP, applied on top of current tip. >>> The code is based on Lin Ming's old patches. >>> >>> You can use 'perf stat' to access to the uncore pmu. For example: >>> perf stat -a -C 0 -e 'uncore_nhm/config=0xffff/' sleep 1 >> >> My main complaint is that that's not user friendly *AT ALL*. >> >> You need to make this useful to mere mortals: go through the >> SDM, categorize interesting looking events, look at how it can >> be expressed via tooling, add a generic event where appropriate, >> provide examples, actually *USE* it to improve the kernel or an >> app and see the workflow as it happens and improve the tooling, >> etc. > > Easiest way out here is add a /sys/bus/event_source/devices/*/events/ > directory which contains files who's name we can use as events and who's > contents are of the form we would use given the format/ stuff. > > Example, suppose a westmere, > > $ cat /sys/bus/event_source/devices/cpu/events/frontend_stalled_cycles > event=0x0e,umask=0x01,inv,cmask=1 > > I'll review the uncore patches later this week, but I suspect the whole > cpu->node mapping stuff is still not done properly. > > Also, quick question, did Intel fix the SNB uncore PMI? No. furthermore there is completely no uncore PMI in Sandy Bridge-EP
Thanks.
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