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Subject[PATCH 52/54] perf annotate: Support to display the IPC/Cycle in TUI mode
Date
From: Jin Yao <yao.jin@linux.intel.com>

Unlike the perf report interactive annotate mode, the perf annotate
doesn't display the IPC/Cycle even if branch info is recorded in perf
data file.

perf record -b ...
perf annotate function

It should show IPC/cycle, but it doesn't.

This patch lets perf annotate support the displaying of IPC/Cycle if
branch info is in perf data.

For example,

perf annotate compute_flag

Percent│ IPC Cycle


│ Disassembly of section .text:

│ 0000000000400640 <compute_flag>:
│ compute_flag():
│ volatile int count;
│ static unsigned int s_randseed;

│ __attribute__((noinline))
│ int compute_flag()
│ {
22.96 │1.18 584 sub $0x8,%rsp
│ int i;

│ i = rand() % 2;
23.02 │1.18 1 → callq rand@plt

│ return i;
27.05 │3.37 mov %eax,%edx
│ }
│3.37 add $0x8,%rsp
│ {
│ int i;

│ i = rand() % 2;

│ return i;
│3.37 shr $0x1f,%edx
│3.37 add %edx,%eax
│3.37 and $0x1,%eax
│3.37 sub %edx,%eax
│ }
26.97 │3.37 2 ← retq

Note that, this patch only supports TUI mode. For stdio, now it just keeps
original behavior. Will support it in a follow-up patch.

$ perf annotate compute_flag --stdio

Percent | Source code & Disassembly of div for cycles:ppp (7993 samples)
------------------------------------------------------------------------------
:
:
:
: Disassembly of section .text:
:
: 0000000000400640 <compute_flag>:
: compute_flag():
: volatile int count;
: static unsigned int s_randseed;
:
: __attribute__((noinline))
: int compute_flag()
: {
0.29 : 400640: sub $0x8,%rsp # +100.00%
: int i;
:
: i = rand() % 2;
42.93 : 400644: callq 400490 <rand@plt> # -100.00% (p:100.00%)
:
: return i;
0.10 : 400649: mov %eax,%edx # +100.00%
: }
0.94 : 40064b: add $0x8,%rsp
: {
: int i;
:
: i = rand() % 2;
:
: return i;
27.02 : 40064f: shr $0x1f,%edx
0.15 : 400652: add %edx,%eax
1.24 : 400654: and $0x1,%eax
2.08 : 400657: sub %edx,%eax
: }
25.26 : 400659: retq # -100.00% (p:100.00%)

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/20180223170210.GC7045@tassilo.jf.intel.com
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1519724327-7773-1-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-annotate.c | 88 ++++++++++++++++++++++++++++++++++++++++---
1 file changed, 82 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index f15731a3d438..ead6ae4549e5 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -44,6 +44,7 @@ struct perf_annotate {
bool full_paths;
bool print_line;
bool skip_missing;
+ bool has_br_stack;
const char *sym_hist_filter;
const char *cpu_list;
DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
@@ -146,16 +147,73 @@ static void process_branch_stack(struct branch_stack *bs, struct addr_location *
free(bi);
}

+static int hist_iter__branch_callback(struct hist_entry_iter *iter,
+ struct addr_location *al __maybe_unused,
+ bool single __maybe_unused,
+ void *arg __maybe_unused)
+{
+ struct hist_entry *he = iter->he;
+ struct branch_info *bi;
+ struct perf_sample *sample = iter->sample;
+ struct perf_evsel *evsel = iter->evsel;
+ int err;
+
+ hist__account_cycles(sample->branch_stack, al, sample, false);
+
+ bi = he->branch_info;
+ err = addr_map_symbol__inc_samples(&bi->from, sample, evsel->idx);
+
+ if (err)
+ goto out;
+
+ err = addr_map_symbol__inc_samples(&bi->to, sample, evsel->idx);
+
+out:
+ return err;
+}
+
+static int process_branch_callback(struct perf_evsel *evsel,
+ struct perf_sample *sample,
+ struct addr_location *al __maybe_unused,
+ struct perf_annotate *ann,
+ struct machine *machine)
+{
+ struct hist_entry_iter iter = {
+ .evsel = evsel,
+ .sample = sample,
+ .add_entry_cb = hist_iter__branch_callback,
+ .hide_unresolved = symbol_conf.hide_unresolved,
+ .ops = &hist_iter_branch,
+ };
+
+ struct addr_location a;
+ int ret;
+
+ if (machine__resolve(machine, &a, sample) < 0)
+ return -1;
+
+ if (a.sym == NULL)
+ return 0;
+
+ if (a.map != NULL)
+ a.map->dso->hit = 1;
+
+ ret = hist_entry_iter__add(&iter, &a, PERF_MAX_STACK_DEPTH, ann);
+ return ret;
+}
+
static int perf_evsel__add_sample(struct perf_evsel *evsel,
struct perf_sample *sample,
struct addr_location *al,
- struct perf_annotate *ann)
+ struct perf_annotate *ann,
+ struct machine *machine)
{
struct hists *hists = evsel__hists(evsel);
struct hist_entry *he;
int ret;

- if (ann->sym_hist_filter != NULL &&
+ if ((!ann->has_br_stack || !ui__has_annotation()) &&
+ ann->sym_hist_filter != NULL &&
(al->sym == NULL ||
strcmp(ann->sym_hist_filter, al->sym->name) != 0)) {
/* We're only interested in a symbol named sym_hist_filter */
@@ -178,6 +236,9 @@ static int perf_evsel__add_sample(struct perf_evsel *evsel,
*/
process_branch_stack(sample->branch_stack, al, sample);

+ if (ann->has_br_stack && ui__has_annotation())
+ return process_branch_callback(evsel, sample, al, ann, machine);
+
he = hists__add_entry(hists, al, NULL, NULL, NULL, sample, true);
if (he == NULL)
return -ENOMEM;
@@ -206,7 +267,8 @@ static int process_sample_event(struct perf_tool *tool,
if (ann->cpu_list && !test_bit(sample->cpu, ann->cpu_bitmap))
goto out_put;

- if (!al.filtered && perf_evsel__add_sample(evsel, sample, &al, ann)) {
+ if (!al.filtered &&
+ perf_evsel__add_sample(evsel, sample, &al, ann, machine)) {
pr_warning("problem incrementing symbol count, "
"skipping event\n");
ret = -1;
@@ -238,6 +300,10 @@ static void hists__find_annotations(struct hists *hists,
if (he->ms.sym == NULL || he->ms.map->dso->annotate_warned)
goto find_next;

+ if (ann->sym_hist_filter &&
+ (strcmp(he->ms.sym->name, ann->sym_hist_filter) != 0))
+ goto find_next;
+
notes = symbol__annotation(he->ms.sym);
if (notes->src == NULL) {
find_next:
@@ -269,6 +335,7 @@ static void hists__find_annotations(struct hists *hists,
nd = rb_next(nd);
} else if (use_browser == 1) {
key = hist_entry__tui_annotate(he, evsel, NULL);
+
switch (key) {
case -1:
if (!ann->skip_missing)
@@ -489,6 +556,9 @@ int cmd_annotate(int argc, const char **argv)
if (annotate.session == NULL)
return -1;

+ annotate.has_br_stack = perf_header__has_feat(&annotate.session->header,
+ HEADER_BRANCH_STACK);
+
ret = symbol__annotation_init();
if (ret < 0)
goto out_delete;
@@ -499,9 +569,6 @@ int cmd_annotate(int argc, const char **argv)
if (ret < 0)
goto out_delete;

- if (setup_sorting(NULL) < 0)
- usage_with_options(annotate_usage, options);
-
if (annotate.use_stdio)
use_browser = 0;
else if (annotate.use_tui)
@@ -511,6 +578,15 @@ int cmd_annotate(int argc, const char **argv)

setup_browser(true);

+ if (use_browser == 1 && annotate.has_br_stack) {
+ sort__mode = SORT_MODE__BRANCH;
+ if (setup_sorting(annotate.session->evlist) < 0)
+ usage_with_options(annotate_usage, options);
+ } else {
+ if (setup_sorting(NULL) < 0)
+ usage_with_options(annotate_usage, options);
+ }
+
ret = __cmd_annotate(&annotate);

out_delete:
--
2.14.3
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