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| author | Yong Wang <yong.y.wang@linux.intel.com> | 2009-06-12 16:08:55 +0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-12 13:48:32 +0200 |
| commit | dff5da6d09daaab40a8741dce0ed3c2e94079de2 (patch) | |
| tree | c1f4ce70e4a566a231ba00c775de4e96fb8acb39 /arch | |
| parent | faafec1e61e61d350248af2a7e5f047606adab6e (diff) | |
| download | linux-dff5da6d09daaab40a8741dce0ed3c2e94079de2.tar.gz linux-dff5da6d09daaab40a8741dce0ed3c2e94079de2.tar.bz2 linux-dff5da6d09daaab40a8741dce0ed3c2e94079de2.zip | |
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@intel.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20090612080855.GA2286@ywang-moblin2.bj.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_counter.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_counter.c b/arch/x86/kernel/cpu/perf_counter.c index 895c82e78455..275bc142cd5d 100644 --- a/arch/x86/kernel/cpu/perf_counter.c +++ b/arch/x86/kernel/cpu/perf_counter.c @@ -968,6 +968,13 @@ 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))) |