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From: Jiri Olsa <jolsa@redhat.com>
To: Stephane Eranian <eranian@google.com>,
	Yan Zheng <zheng.z.yan@intel.com>,
	Andi Kleen <andi@firstfloor.org>
Cc: linux-kernel@vger.kernel.org,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Corey Ashford <cjashfor@linux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	Ingo Molnar <mingo@kernel.org>, Paul Mackerras <paulus@samba.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Stephane Eranian <eranian@google.com>,
	Joe Mario <jmario@redhat.com>,
	Richard Fowles <rfowles@redhat.com>,
	Don Zickus <dzickus@redhat.com>
Subject: [RFC/BUG] not working LLC-load-misses on SandyBridge (42) and Haswell
Date: Mon, 2 Jun 2014 13:56:40 +0200	[thread overview]
Message-ID: <20140602115550.GA1215@krava.brq.redhat.com> (raw)
In-Reply-To: <20140601142622.GA9131@krava.brq.redhat.com>

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

[jolsa@krava 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

  reply	other threads:[~2014-06-02 11:57 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-05-23 15:15 [RFC/PATCH 0/2] perf tools: Factor sort elide Jiri Olsa
2014-05-23 15:15 ` [PATCH 1/2] perf tools: Remove elide setup for SORT_MODE__MEMORY mode Jiri Olsa
2014-06-05 14:31   ` [tip:perf/core] " tip-bot for Jiri Olsa
2014-05-23 15:15 ` [PATCH 2/2] perf tools: Move elide bool into perf_hpp_fmt struct Jiri Olsa
2014-05-30  5:47 ` [RFC/PATCH 0/2] perf tools: Factor sort elide Namhyung Kim
2014-06-01 14:26   ` [PATCHv2] perf tools: Move elide bool into perf_hpp_fmt struct Jiri Olsa
2014-06-02 11:56     ` Jiri Olsa [this message]
2014-06-02 15:25       ` [RFC/BUG] not working LLC-load-misses on SandyBridge (42) and Haswell Andi Kleen
2014-06-05 14:32     ` [tip:perf/core] perf tools: Move elide bool into perf_hpp_fmt struct tip-bot for Jiri Olsa

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