perf, x86: Add a key to simplify template lookup in Pentium-4 PMU

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Currently, we use opcode(Event and Event-Selector) + emask to
look up template in p4_templates.

But cache events (L1-dcache-load-misses, LLC-load-misses, etc)
use the same event(P4_REPLAY_EVENT) to do the counting, ie, they
have the same opcode and emask. So we can not use current lookup
mechanism to find the template for cache events.

This patch introduces a "key", which is the index into
p4_templates. The low 12 bits of CCCR are reserved, so we can
hide the "key" in the low 12 bits of hwc->config.

We extract the key from hwc->config and then quickly find the
template.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Reviewed-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1268908387.13901.127.camel@minggr.sh.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Lin Ming 2010-03-18 18:33:07 +08:00 • committed by Ingo Molnar

parent 55632770d7

commit f34edbc1cd

2 changed files with 38 additions and 53 deletions

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5

arch/x86/include/asm/perf_event_p4.h

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86

arch/x86/kernel/cpu/perf_event_p4.c

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