diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2011-10-05 14:01:17 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-10-06 13:00:31 +0200 |
| commit | 011af857847a7ebe1f45342b29ff9f390515a4b8 (patch) | |
| tree | 3645fd8d9f8b7a40b79d779db4e9ac29b7af0123 /arch/x86/kernel/cpu | |
| parent | a240f76165e6255384d4bdb8139895fac7988799 (diff) | |
| download | blackbird-op-linux-011af857847a7ebe1f45342b29ff9f390515a4b8.tar.gz blackbird-op-linux-011af857847a7ebe1f45342b29ff9f390515a4b8.zip | |
perf, amd: Use GO/HO bits in perf-ctr
The AMD perf-counters support counting in guest or host-mode
only. Make use of that feature when user-space specified
guest/host-mode only counting.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1317816084-18026-3-git-send-email-gleb@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu')
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event_amd.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c index 384450d67128..db8e603ff0c6 100644 --- a/arch/x86/kernel/cpu/perf_event_amd.c +++ b/arch/x86/kernel/cpu/perf_event_amd.c @@ -138,6 +138,19 @@ static int amd_pmu_hw_config(struct perf_event *event) if (ret) return ret; + if (event->attr.exclude_host && event->attr.exclude_guest) + /* + * When HO == GO == 1 the hardware treats that as GO == HO == 0 + * and will count in both modes. We don't want to count in that + * case so we emulate no-counting by setting US = OS = 0. + */ + event->hw.config &= ~(ARCH_PERFMON_EVENTSEL_USR | + ARCH_PERFMON_EVENTSEL_OS); + else if (event->attr.exclude_host) + event->hw.config |= AMD_PERFMON_EVENTSEL_GUESTONLY; + else if (event->attr.exclude_guest) + event->hw.config |= AMD_PERFMON_EVENTSEL_HOSTONLY; + if (event->attr.type != PERF_TYPE_RAW) return 0; |
