summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/cpu
diff options
context:
space:
mode:
authorPeter Zijlstra <a.p.zijlstra@chello.nl>2010-12-14 21:26:40 +0100
committerIngo Molnar <mingo@elte.hu>2010-12-16 11:36:44 +0100
commit7639dae0ca11038286bbbcda05f2bef601c1eb8d (patch)
tree5cfcea4ea730cf255c6fb960577083f17c876377 /arch/x86/kernel/cpu
parentperf: Sysfs enumeration (diff)
downloadlinux-7639dae0ca11038286bbbcda05f2bef601c1eb8d.tar.xz
linux-7639dae0ca11038286bbbcda05f2bef601c1eb8d.zip
perf, x86: Provide a PEBS capable cycle event
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/cpu')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel.c26
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index c8f5c088cad1..24e390e40f2e 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -816,6 +816,32 @@ static int intel_pmu_hw_config(struct perf_event *event)
if (ret)
return ret;
+ if (event->attr.precise_ip &&
+ (event->hw.config & X86_RAW_EVENT_MASK) == 0x003c) {
+ /*
+ * Use an alternative encoding for CPU_CLK_UNHALTED.THREAD_P
+ * (0x003c) so that we can use it with PEBS.
+ *
+ * The regular CPU_CLK_UNHALTED.THREAD_P event (0x003c) isn't
+ * PEBS capable. However we can use INST_RETIRED.ANY_P
+ * (0x00c0), which is a PEBS capable event, to get the same
+ * count.
+ *
+ * INST_RETIRED.ANY_P counts the number of cycles that retires
+ * CNTMASK instructions. By setting CNTMASK to a value (16)
+ * larger than the maximum number of instructions that can be
+ * retired per cycle (4) and then inverting the condition, we
+ * count all cycles that retire 16 or less instructions, which
+ * is every cycle.
+ *
+ * Thereby we gain a PEBS capable cycle counter.
+ */
+ u64 alt_config = 0x108000c0; /* INST_RETIRED.TOTAL_CYCLES */
+
+ alt_config |= (event->hw.config & ~X86_RAW_EVENT_MASK);
+ event->hw.config = alt_config;
+ }
+
if (event->attr.type != PERF_TYPE_RAW)
return 0;