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-rw-r--r--tools/perf/util/session.c64
1 files changed, 58 insertions, 6 deletions
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 0baf75f12b7c..504b7e664e6c 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -553,15 +553,67 @@ int perf_session_queue_event(struct perf_session *s, union perf_event *event,
return 0;
}
-static void callchain__printf(struct perf_sample *sample)
+static void callchain__lbr_callstack_printf(struct perf_sample *sample)
{
+ struct ip_callchain *callchain = sample->callchain;
+ struct branch_stack *lbr_stack = sample->branch_stack;
+ u64 kernel_callchain_nr = callchain->nr;
unsigned int i;
- printf("... chain: nr:%" PRIu64 "\n", sample->callchain->nr);
+ for (i = 0; i < kernel_callchain_nr; i++) {
+ if (callchain->ips[i] == PERF_CONTEXT_USER)
+ break;
+ }
+
+ if ((i != kernel_callchain_nr) && lbr_stack->nr) {
+ u64 total_nr;
+ /*
+ * LBR callstack can only get user call chain,
+ * i is kernel call chain number,
+ * 1 is PERF_CONTEXT_USER.
+ *
+ * The user call chain is stored in LBR registers.
+ * LBR are pair registers. The caller is stored
+ * in "from" register, while the callee is stored
+ * in "to" register.
+ * For example, there is a call stack
+ * "A"->"B"->"C"->"D".
+ * The LBR registers will recorde like
+ * "C"->"D", "B"->"C", "A"->"B".
+ * So only the first "to" register and all "from"
+ * registers are needed to construct the whole stack.
+ */
+ total_nr = i + 1 + lbr_stack->nr + 1;
+ kernel_callchain_nr = i + 1;
+
+ printf("... LBR call chain: nr:%" PRIu64 "\n", total_nr);
+
+ for (i = 0; i < kernel_callchain_nr; i++)
+ printf("..... %2d: %016" PRIx64 "\n",
+ i, callchain->ips[i]);
+
+ printf("..... %2d: %016" PRIx64 "\n",
+ (int)(kernel_callchain_nr), lbr_stack->entries[0].to);
+ for (i = 0; i < lbr_stack->nr; i++)
+ printf("..... %2d: %016" PRIx64 "\n",
+ (int)(i + kernel_callchain_nr + 1), lbr_stack->entries[i].from);
+ }
+}
+
+static void callchain__printf(struct perf_evsel *evsel,
+ struct perf_sample *sample)
+{
+ unsigned int i;
+ struct ip_callchain *callchain = sample->callchain;
+
+ if (has_branch_callstack(evsel))
+ callchain__lbr_callstack_printf(sample);
+
+ printf("... FP chain: nr:%" PRIu64 "\n", callchain->nr);
- for (i = 0; i < sample->callchain->nr; i++)
+ for (i = 0; i < callchain->nr; i++)
printf("..... %2d: %016" PRIx64 "\n",
- i, sample->callchain->ips[i]);
+ i, callchain->ips[i]);
}
static void branch_stack__printf(struct perf_sample *sample)
@@ -718,9 +770,9 @@ static void dump_sample(struct perf_evsel *evsel, union perf_event *event,
sample_type = evsel->attr.sample_type;
if (sample_type & PERF_SAMPLE_CALLCHAIN)
- callchain__printf(sample);
+ callchain__printf(evsel, sample);
- if (sample_type & PERF_SAMPLE_BRANCH_STACK)
+ if ((sample_type & PERF_SAMPLE_BRANCH_STACK) && !has_branch_callstack(evsel))
branch_stack__printf(sample);
if (sample_type & PERF_SAMPLE_REGS_USER)
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