linux-kernel - [RFC/BUG] not working LLC-load-misses on SandyBridge (42) and Haswell

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Date:	Mon, 2 Jun 2014 13:56:40 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>,
	Yan Zheng <zheng.z.yan@...el.com>,
	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Stephane Eranian <eranian@...gle.com>,
	Joe Mario <jmario@...hat.com>,
	Richard Fowles <rfowles@...hat.com>,
	Don Zickus <dzickus@...hat.com>
Subject: [RFC/BUG] not working LLC-load-misses on SandyBridge (42) and Haswell

hi,
Joe asked about issues with LLC-load-misses on Haswell. I tried
and found it non functional on SandyBridge (42) as well:

[jolsa@...va perf]$ ./perf stat -e LLC-load-misses ls
...

 Performance counter stats for 'ls':

   <not supported>      LLC-load-misses          

       0.007195547 seconds time elapsed


both SandyBridge (42 and 45) share following config arrays:
  snb_hw_cache_event_ids and snb_hw_cache_extra_regs

but have different 'x86_pmu.extra_regs' which makes LLC-load-misses
event fail (in valid_mask check) in x86_pmu_extra_regs function

Haswell is sharing the same extra regs/ids config as SandyBridge (42),
so it suffers in the same way.

Not sure if thats known issue, but it looks like we need special
set of snb_hw_cache_event_ids for SandyBridge (42) ?

thanks for info,
jirka
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