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Date: Fri, 12 Jun 2009 16:08:55 +0800 From: Yong Wang <yong.y.wang@...ux.intel.com> To: Ingo Molnar <mingo@...e.hu> Cc: linux-kernel@...r.kernel.org Subject: [PATCH -tip] perf_counter/x86: Add a quirk for Atom processors The fixed-function performance counters do not work on current Atom processors. Use the general-purpose ones instead. Signed-off-by: Yong Wang <yong.y.wang@...el.com> --- perf_counter.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index 895c82e..4bba0d8 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -968,6 +968,12 @@ fixed_mode_idx(struct perf_counter *counter, struct hw_perf_counter *hwc) if (!x86_pmu.num_counters_fixed) return -1; + /* + * Quirk: IA32_FIXED_CTRs do not work on current Atom processors + */ + if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL && boot_cpu_data.x86_model == 28) + return -1; + event = hwc->config & ARCH_PERFMON_EVENT_MASK; if (unlikely(event == x86_pmu.event_map(PERF_COUNT_HW_INSTRUCTIONS))) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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