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Subject[PATCH v1 5/5] perf report: Show branch type in callchain entry
Date
Show branch type in callchain entry. The branch type is printed
with other LBR information (such as cycles/abort/...).

The branch types are:

JCC forward: Conditional forward jump
JCC backward: Conditional backward jump
JMP: Jump imm
IND_JMP: Jump reg/mem
CALL: Call imm
IND_CALL: Call reg/mem
RET: Ret
FAR_BRANCH: SYSCALL/SYSRET, IRQ, IRET, TSX Abort

One example:
perf report --branch-history --stdio --no-children

--23.91%--main div.c:42 (RET cycles:2)
compute_flag div.c:28 (RET cycles:2)
compute_flag div.c:27 (RET cycles:1)
rand rand.c:28 (RET cycles:1)
rand rand.c:28 (RET cycles:1)
__random random.c:298 (RET cycles:1)
__random random.c:297 (JCC forward cycles:1)
__random random.c:295 (JCC forward cycles:1)
__random random.c:295 (JCC forward cycles:1)
__random random.c:295 (JCC forward cycles:1)
__random random.c:295 (RET cycles:9)

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/util/callchain.c | 168 ++++++++++++++++++++++++++++----------------
tools/perf/util/callchain.h | 13 ++++
tools/perf/util/event.h | 3 +-
3 files changed, 124 insertions(+), 60 deletions(-)

diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 3cea1fb..f8f4c26 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -428,6 +428,44 @@ create_child(struct callchain_node *parent, bool inherit_children)
return new;
}

+static const char *br_type_name[BR_IDX_MAX] = {
+ "JCC forward",
+ "JCC backward",
+ "JMP",
+ "IND_JMP",
+ "CALL",
+ "IND_CALL",
+ "RET",
+ "FAR_BRANCH",
+};
+
+static void
+branch_type_count(int *counts, struct branch_flags *flags)
+{
+ if ((flags->type & PERF_BR_CALL) == PERF_BR_CALL)
+ counts[BR_IDX_CALL]++;
+
+ if ((flags->type & PERF_BR_RET) == PERF_BR_RET)
+ counts[BR_IDX_RET]++;
+
+ if ((flags->type & PERF_BR_FAR_BRANCH) == PERF_BR_FAR_BRANCH)
+ counts[BR_IDX_FAR_BRANCH]++;
+
+ if ((flags->type & PERF_BR_JCC_FWD) == PERF_BR_JCC_FWD)
+ counts[BR_IDX_JCC_FWD]++;
+
+ if ((flags->type & PERF_BR_JCC_BWD) == PERF_BR_JCC_BWD)
+ counts[BR_IDX_JCC_BWD]++;
+
+ if ((flags->type & PERF_BR_JMP) == PERF_BR_JMP)
+ counts[BR_IDX_JMP]++;
+
+ if ((flags->type & PERF_BR_IND_CALL) == PERF_BR_IND_CALL)
+ counts[BR_IDX_IND_CALL]++;
+
+ if ((flags->type & PERF_BR_IND_JMP) == PERF_BR_IND_JMP)
+ counts[BR_IDX_IND_JMP]++;
+}

/*
* Fill the node with callchain values
@@ -467,6 +505,9 @@ fill_node(struct callchain_node *node, struct callchain_cursor *cursor)
call->cycles_count = cursor_node->branch_flags.cycles;
call->iter_count = cursor_node->nr_loop_iter;
call->samples_count = cursor_node->samples;
+
+ branch_type_count(call->brtype_count,
+ &cursor_node->branch_flags);
}

list_add_tail(&call->list, &node->val);
@@ -579,6 +620,9 @@ static enum match_result match_chain(struct callchain_cursor_node *node,
cnode->cycles_count += node->branch_flags.cycles;
cnode->iter_count += node->nr_loop_iter;
cnode->samples_count += node->samples;
+
+ branch_type_count(cnode->brtype_count,
+ &node->branch_flags);
}

return MATCH_EQ;
@@ -1105,95 +1149,100 @@ int callchain_branch_counts(struct callchain_root *root,
cycles_count);
}

+static int branch_type_str(int *counts, char *bf, int bfsize)
+{
+ int i, printed = 0;
+
+ for (i = 0; i < BR_IDX_MAX; i++) {
+ if (printed == bfsize - 1)
+ return printed;
+
+ if (counts[i] > 0) {
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " (%s", br_type_name[i]);
+ }
+ }
+
+ return printed;
+}
+
static int counts_str_build(char *bf, int bfsize,
u64 branch_count, u64 predicted_count,
u64 abort_count, u64 cycles_count,
- u64 iter_count, u64 samples_count)
+ u64 iter_count, u64 samples_count,
+ int *brtype_count)
{
- double predicted_percent = 0.0;
- const char *null_str = "";
- char iter_str[32];
- char cycle_str[32];
- char *istr, *cstr;
u64 cycles;
+ int printed, i = 0;

if (branch_count == 0)
return scnprintf(bf, bfsize, " (calltrace)");

- cycles = cycles_count / branch_count;
+ printed = branch_type_str(brtype_count, bf, bfsize);
+ if (printed)
+ i++;

- if (iter_count && samples_count) {
- if (cycles > 0)
- scnprintf(iter_str, sizeof(iter_str),
- " iterations:%" PRId64 "",
- iter_count / samples_count);
+ cycles = cycles_count / branch_count;
+ if (cycles) {
+ if (i++)
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " cycles:%" PRId64 "", cycles);
else
- scnprintf(iter_str, sizeof(iter_str),
- "iterations:%" PRId64 "",
- iter_count / samples_count);
- istr = iter_str;
- } else
- istr = (char *)null_str;
-
- if (cycles > 0) {
- scnprintf(cycle_str, sizeof(cycle_str),
- "cycles:%" PRId64 "", cycles);
- cstr = cycle_str;
- } else
- cstr = (char *)null_str;
-
- predicted_percent = predicted_count * 100.0 / branch_count;
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " (cycles:%" PRId64 "", cycles);
+ }

- if ((predicted_count == branch_count) && (abort_count == 0)) {
- if ((cycles > 0) || (istr != (char *)null_str))
- return scnprintf(bf, bfsize, " (%s%s)", cstr, istr);
+ if (iter_count && samples_count) {
+ if (i++)
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " iterations:%" PRId64 "",
+ iter_count / samples_count);
else
- return scnprintf(bf, bfsize, "%s", (char *)null_str);
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " (iterations:%" PRId64 "",
+ iter_count / samples_count);
}

- if ((predicted_count < branch_count) && (abort_count == 0)) {
- if ((cycles > 0) || (istr != (char *)null_str))
- return scnprintf(bf, bfsize,
- " (predicted:%.1f%% %s%s)",
- predicted_percent, cstr, istr);
- else {
- return scnprintf(bf, bfsize,
- " (predicted:%.1f%%)",
- predicted_percent);
- }
+ if (predicted_count < branch_count) {
+ if (i++)
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " predicted:%.1f%%",
+ predicted_count * 100.0 / branch_count);
+ else
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " (predicted:%.1f%%",
+ predicted_count * 100.0 / branch_count);
}

- if ((predicted_count == branch_count) && (abort_count > 0)) {
- if ((cycles > 0) || (istr != (char *)null_str))
- return scnprintf(bf, bfsize,
- " (abort:%" PRId64 " %s%s)",
- abort_count, cstr, istr);
+ if (abort_count) {
+ if (i++)
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " abort:%.1f%%",
+ abort_count * 100.0 / branch_count);
else
- return scnprintf(bf, bfsize,
- " (abort:%" PRId64 ")",
- abort_count);
+ printed += scnprintf(bf + printed, bfsize - printed,
+ " (abort:%.1f%%",
+ abort_count * 100.0 / branch_count);
}

- if ((cycles > 0) || (istr != (char *)null_str))
- return scnprintf(bf, bfsize,
- " (predicted:%.1f%% abort:%" PRId64 " %s%s)",
- predicted_percent, abort_count, cstr, istr);
+ if (i)
+ return scnprintf(bf + printed, bfsize - printed, ")");

- return scnprintf(bf, bfsize,
- " (predicted:%.1f%% abort:%" PRId64 ")",
- predicted_percent, abort_count);
+ bf[0] = 0;
+ return 0;
}

static int callchain_counts_printf(FILE *fp, char *bf, int bfsize,
u64 branch_count, u64 predicted_count,
u64 abort_count, u64 cycles_count,
- u64 iter_count, u64 samples_count)
+ u64 iter_count, u64 samples_count,
+ int *brtype_count)
{
char str[128];

counts_str_build(str, sizeof(str), branch_count,
predicted_count, abort_count, cycles_count,
- iter_count, samples_count);
+ iter_count, samples_count, brtype_count);

if (fp)
return fprintf(fp, "%s", str);
@@ -1225,7 +1274,8 @@ int callchain_list_counts__printf_value(struct callchain_node *node,

return callchain_counts_printf(fp, bf, bfsize, branch_count,
predicted_count, abort_count,
- cycles_count, iter_count, samples_count);
+ cycles_count, iter_count, samples_count,
+ clist->brtype_count);
}

static void free_callchain_node(struct callchain_node *node)
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h
index c56c23d..994aa5a 100644
--- a/tools/perf/util/callchain.h
+++ b/tools/perf/util/callchain.h
@@ -106,6 +106,18 @@ struct callchain_param {
extern struct callchain_param callchain_param;
extern struct callchain_param callchain_param_default;

+enum {
+ BR_IDX_JCC_FWD = 0,
+ BR_IDX_JCC_BWD = 1,
+ BR_IDX_JMP = 2,
+ BR_IDX_IND_JMP = 3,
+ BR_IDX_CALL = 4,
+ BR_IDX_IND_CALL = 5,
+ BR_IDX_RET = 6,
+ BR_IDX_FAR_BRANCH = 7,
+ BR_IDX_MAX,
+};
+
struct callchain_list {
u64 ip;
struct map_symbol ms;
@@ -119,6 +131,7 @@ struct callchain_list {
u64 cycles_count;
u64 iter_count;
u64 samples_count;
+ int brtype_count[BR_IDX_MAX];
char *srcline;
struct list_head list;
};
diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h
index eb7a7b2..4c1a6da 100644
--- a/tools/perf/util/event.h
+++ b/tools/perf/util/event.h
@@ -142,7 +142,8 @@ struct branch_flags {
u64 in_tx:1;
u64 abort:1;
u64 cycles:16;
- u64 reserved:44;
+ u64 type:9;
+ u64 reserved:35;
};

struct branch_entry {
--
2.7.4
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