[PATCH V7 16/17] perf tools: handle LBR call stack data
From: Kan Liang
Date: Tue Nov 04 2014 - 22:11:16 EST
From: Kan Liang <kan.liang@xxxxxxxxx>
The LBR call stack data will be output as PERF_SAMPLE_BRANCH_STACK data
format. ip_callchain is changed to show available callchain source.
LBR call stack also need to be shown in user space.
Perf test also changes accordingly.
Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
---
tools/perf/tests/hists_cumulate.c | 20 ++++++++++----------
tools/perf/tests/sample-parsing.c | 2 +-
tools/perf/util/event.h | 8 ++++++++
tools/perf/util/evsel.c | 21 +++++++++++++--------
4 files changed, 32 insertions(+), 19 deletions(-)
diff --git a/tools/perf/tests/hists_cumulate.c b/tools/perf/tests/hists_cumulate.c
index 614d5c4..8967ae6 100644
--- a/tools/perf/tests/hists_cumulate.c
+++ b/tools/perf/tests/hists_cumulate.c
@@ -48,29 +48,29 @@ static struct sample fake_samples[] = {
*/
static u64 fake_callchains[][10] = {
/* schedule => run_command => main */
- { 3, FAKE_IP_KERNEL_SCHEDULE, FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
+ { 1, 3, FAKE_IP_KERNEL_SCHEDULE, FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
/* main */
- { 1, FAKE_IP_PERF_MAIN, },
+ { 1, 1, FAKE_IP_PERF_MAIN, },
/* cmd_record => run_command => main */
- { 3, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
+ { 1, 3, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
/* malloc => cmd_record => run_command => main */
- { 4, FAKE_IP_LIBC_MALLOC, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND,
+ { 1, 4, FAKE_IP_LIBC_MALLOC, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND,
FAKE_IP_PERF_MAIN, },
/* free => cmd_record => run_command => main */
- { 4, FAKE_IP_LIBC_FREE, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND,
+ { 1, 4, FAKE_IP_LIBC_FREE, FAKE_IP_PERF_CMD_RECORD, FAKE_IP_PERF_RUN_COMMAND,
FAKE_IP_PERF_MAIN, },
/* main */
- { 1, FAKE_IP_PERF_MAIN, },
+ { 1, 1, FAKE_IP_PERF_MAIN, },
/* page_fault => sys_perf_event_open => run_command => main */
- { 4, FAKE_IP_KERNEL_PAGE_FAULT, FAKE_IP_KERNEL_SYS_PERF_EVENT_OPEN,
+ { 1, 4, FAKE_IP_KERNEL_PAGE_FAULT, FAKE_IP_KERNEL_SYS_PERF_EVENT_OPEN,
FAKE_IP_PERF_RUN_COMMAND, FAKE_IP_PERF_MAIN, },
/* main */
- { 1, FAKE_IP_BASH_MAIN, },
+ { 1, 1, FAKE_IP_BASH_MAIN, },
/* xmalloc => malloc => xmalloc => malloc => xmalloc => main */
- { 6, FAKE_IP_BASH_XMALLOC, FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_XMALLOC,
+ { 1, 6, FAKE_IP_BASH_XMALLOC, FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_XMALLOC,
FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_XMALLOC, FAKE_IP_BASH_MAIN, },
/* page_fault => malloc => main */
- { 3, FAKE_IP_KERNEL_PAGE_FAULT, FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_MAIN, },
+ { 1, 3, FAKE_IP_KERNEL_PAGE_FAULT, FAKE_IP_LIBC_MALLOC, FAKE_IP_BASH_MAIN, },
};
static int add_hist_entries(struct hists *hists, struct machine *machine)
diff --git a/tools/perf/tests/sample-parsing.c b/tools/perf/tests/sample-parsing.c
index ca292f9..dfa9dfa 100644
--- a/tools/perf/tests/sample-parsing.c
+++ b/tools/perf/tests/sample-parsing.c
@@ -145,7 +145,7 @@ static int do_test(u64 sample_type, u64 sample_regs_user, u64 read_format)
u64 data[64];
} callchain = {
/* 3 ips */
- .data = {3, 201, 202, 203},
+ .data = {1, 3, 201, 202, 203},
};
union {
struct branch_stack branch_stack;
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index 8c7fe9d..efeefe7 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -119,7 +119,15 @@ struct sample_read {
};
};
+/*
+ * From Haswell, the existing Last Branch Record facility can
+ * also be used to record call chains.
+ * source: indicates the available call chains source.
+ */
+#define PERF_FP_CALLCHAIN 0x01
+#define PERF_LBR_CALLCHAIN 0x02
struct ip_callchain {
+ u64 source;
u64 nr;
u64 ips[0];
};
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 2f9e680..ff472d6 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1028,7 +1028,6 @@ static size_t perf_event_attr__fprintf(struct perf_event_attr *attr, FILE *fp)
ret += PRINT_ATTR2(exclude_host, exclude_guest);
ret += PRINT_ATTR2N("excl.callchain_kern", exclude_callchain_kernel,
"excl.callchain_user", exclude_callchain_user);
-
ret += PRINT_ATTR_U32(wakeup_events);
ret += PRINT_ATTR_U32(wakeup_watermark);
ret += PRINT_ATTR_X32(bp_type);
@@ -1440,10 +1439,10 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
const u64 max_callchain_nr = UINT64_MAX / sizeof(u64);
OVERFLOW_CHECK_u64(array);
- data->callchain = (struct ip_callchain *)array++;
+ data->callchain = (struct ip_callchain *)array;
if (data->callchain->nr > max_callchain_nr)
return -EFAULT;
- sz = data->callchain->nr * sizeof(u64);
+ sz = (data->callchain->nr + 2) * sizeof(u64);
OVERFLOW_CHECK(array, sz, max_size);
array = (void *)array + sz;
}
@@ -1466,7 +1465,9 @@ int perf_evsel__parse_sample(struct perf_evsel *evsel, union perf_event *event,
array = (void *)array + data->raw_size;
}
- if (type & PERF_SAMPLE_BRANCH_STACK) {
+ if ((type & PERF_SAMPLE_BRANCH_STACK) ||
+ (data->callchain &&
+ (data->callchain->source & PERF_LBR_CALLCHAIN))) {
const u64 max_branch_nr = UINT64_MAX /
sizeof(struct branch_entry);
@@ -1590,7 +1591,7 @@ size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
}
if (type & PERF_SAMPLE_CALLCHAIN) {
- sz = (sample->callchain->nr + 1) * sizeof(u64);
+ sz = (sample->callchain->nr + 2) * sizeof(u64);
result += sz;
}
@@ -1599,7 +1600,9 @@ size_t perf_event__sample_event_size(const struct perf_sample *sample, u64 type,
result += sample->raw_size;
}
- if (type & PERF_SAMPLE_BRANCH_STACK) {
+ if ((type & PERF_SAMPLE_BRANCH_STACK) ||
+ (sample->callchain &&
+ (sample->callchain->source & PERF_LBR_CALLCHAIN))) {
sz = sample->branch_stack->nr * sizeof(struct branch_entry);
sz += sizeof(u64);
result += sz;
@@ -1745,7 +1748,7 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type,
}
if (type & PERF_SAMPLE_CALLCHAIN) {
- sz = (sample->callchain->nr + 1) * sizeof(u64);
+ sz = (sample->callchain->nr + 2) * sizeof(u64);
memcpy(array, sample->callchain, sz);
array = (void *)array + sz;
}
@@ -1768,7 +1771,9 @@ int perf_event__synthesize_sample(union perf_event *event, u64 type,
array = (void *)array + sample->raw_size;
}
- if (type & PERF_SAMPLE_BRANCH_STACK) {
+ if ((type & PERF_SAMPLE_BRANCH_STACK) ||
+ (sample->callchain &&
+ (sample->callchain->source & PERF_LBR_CALLCHAIN))) {
sz = sample->branch_stack->nr * sizeof(struct branch_entry);
sz += sizeof(u64);
memcpy(array, sample->branch_stack, sz);
--
1.8.3.2
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