x86, perf_counter, bts: Fail if BTS is not available

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Reserve PERF_COUNT_HW_BRANCH_INSTRUCTIONS with sample_period ==
1 for BTS tracing and fail, if BTS is not available.

Signed-off-by: Markus Metzger <markus.t.metzger@intel.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <20090902140612.943801000@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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markus.t.metzger@intel.com 2009-09-02 16:04:46 +02:00 • committed by Ingo Molnar

parent dc86cabe4b

commit 747b50aaf7

1 changed files with 11 additions and 14 deletions

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arch/x86/kernel/cpu/perf_counter.c

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