[PATCH v2 6/6] perf report: Display columns Predicted/Abort/Cycles in --branch-history

Jin Yao
2016-10-19T14:14:57Z

Use current sort mechanism but the real .se_cmp() just returns 0 so
that new columns "Predicted", "Abort" and Cycles are created in display
but actually these keys are not the sort keys.

For example:

Overhead Source:Line Symbol Shared Object Predicted Abort Cycles
........ ............ ........ ............. ......... ..... ......

38.25% div.c:45 [.] main div 97.6% 0.0% 3

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
---
tools/perf/Documentation/perf-report.txt | 8 +++
tools/perf/builtin-report.c | 6 +-
tools/perf/util/hist.c | 3 +
tools/perf/util/hist.h | 3 +
tools/perf/util/sort.c | 117 ++++++++++++++++++++++++++++++-
tools/perf/util/sort.h | 3 +
6 files changed, 138 insertions(+), 2 deletions(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index 2d17462..bb927cb 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -335,6 +335,14 @@ OPTIONS
--branch-history::
Add the addresses of sampled taken branches to the callstack.
This allows to examine the path the program took to each sample.
+
+ Also show with some branch flags that can be:
+ - Predicted: display the average percentage of predicated branches.
+ (predicated number / total number)
+ - Abort: display the average percentage of abort branches.
+ (abort number /total number)
+ - Cycles: cycles in basic block.
+
The data collection must have used -b (or -j) and -g.

--objdump=<path>::
diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index c406393..df83ea4 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -664,6 +664,10 @@ const char report_callchain_help[] = "Display call graph (stack chain/backtrace)
CALLCHAIN_REPORT_HELP
"\n\t\t\t\tDefault: " CALLCHAIN_DEFAULT_OPT;

+#define CALLCHAIN_BRANCH_SORT_ORDER \
+ "srcline,symbol,dso,callchain_branch_predicted," \
+ "callchain_branch_abort,callchain_branch_cycles"
+
int cmd_report(int argc, const char **argv, const char *prefix __maybe_unused)
{
struct perf_session *session;
@@ -924,7 +928,7 @@ repeat:
symbol_conf.use_callchain = true;
callchain_register_param(&callchain_param);
if (sort_order == NULL)
- sort_order = "srcline,symbol,dso";
+ sort_order = CALLCHAIN_BRANCH_SORT_ORDER;
}

if (report.mem_mode) {
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index e1be413..2470fff 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -176,6 +176,9 @@ void hists__calc_col_len(struct hists *hists, struct hist_entry *h)
hists__new_col_len(hists, HISTC_MEM_LVL, 21 + 3);
hists__new_col_len(hists, HISTC_LOCAL_WEIGHT, 12);
hists__new_col_len(hists, HISTC_GLOBAL_WEIGHT, 12);
+ hists__new_col_len(hists, HISTC_CALLCHAIN_BRANCH_PREDICTED, 9);
+ hists__new_col_len(hists, HISTC_CALLCHAIN_BRANCH_ABORT, 5);
+ hists__new_col_len(hists, HISTC_CALLCHAIN_BRANCH_CYCLES, 6);

if (h->srcline) {
len = MAX(strlen(h->srcline), strlen(sort_srcline.se_header));
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index d4b6514..74e1dd4 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -57,6 +57,9 @@ enum hist_column {
HISTC_SRCLINE_FROM,
HISTC_SRCLINE_TO,
HISTC_TRACE,
+ HISTC_CALLCHAIN_BRANCH_PREDICTED,
+ HISTC_CALLCHAIN_BRANCH_ABORT,
+ HISTC_CALLCHAIN_BRANCH_CYCLES,
HISTC_NR_COLS, /* Last entry */
};

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index df622f4..e47a984 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -435,6 +435,106 @@ struct sort_entry sort_srcline_to = {
.se_width_idx = HISTC_SRCLINE_TO,
};

+/* --sort callchain_branch_predicted */
+
+static int64_t
+sort__callchain_branch_predicted_cmp(struct hist_entry *left __maybe_unused,
+ struct hist_entry *right __maybe_unused)
+{
+ return 0;
+}
+
+static int hist_entry__callchain_branch_predicted_snprintf(
+ struct hist_entry *he, char *bf, size_t size, unsigned int width)
+{
+ u64 branch_count, predicted_count;
+ double percent = 0.0;
+ char str[32];
+
+ callchain_branch_counts(he->callchain, &branch_count,
+ &predicted_count, NULL, NULL);
+
+ if (branch_count)
+ percent = predicted_count * 100.0 / branch_count;
+
+ snprintf(str, sizeof(str), "%.1f%%", percent);
+ return repsep_snprintf(bf, size, "%-*.*s", width, width, str);
+}
+
+struct sort_entry sort_callchain_branch_predicted = {
+ .se_header = "Predicted",
+ .se_cmp = sort__callchain_branch_predicted_cmp,
+ .se_snprintf = hist_entry__callchain_branch_predicted_snprintf,
+ .se_width_idx = HISTC_CALLCHAIN_BRANCH_PREDICTED,
+};
+
+/* --sort callchain_branch_abort */
+
+static int64_t
+sort__callchain_branch_abort_cmp(struct hist_entry *left __maybe_unused,
+ struct hist_entry *right __maybe_unused)
+{
+ return 0;
+}
+
+static int hist_entry__callchain_branch_abort_snprintf(struct hist_entry *he,
+ char *bf, size_t size,
+ unsigned int width)
+{
+ u64 branch_count, abort_count;
+ double percent = 0.0;
+ char str[32];
+
+ callchain_branch_counts(he->callchain, &branch_count,
+ NULL, &abort_count, NULL);
+
+ if (branch_count)
+ percent = abort_count * 100.0 / branch_count;
+
+ snprintf(str, sizeof(str), "%.1f%%", percent);
+ return repsep_snprintf(bf, size, "%-*.*s", width, width, str);
+}
+
+struct sort_entry sort_callchain_branch_abort = {
+ .se_header = "Abort",
+ .se_cmp = sort__callchain_branch_abort_cmp,
+ .se_snprintf = hist_entry__callchain_branch_abort_snprintf,
+ .se_width_idx = HISTC_CALLCHAIN_BRANCH_ABORT,
+};
+
+/* --sort callchain_branch_cycles */
+
+static int64_t
+sort__callchain_branch_cycles_cmp(struct hist_entry *left __maybe_unused,
+ struct hist_entry *right __maybe_unused)
+{
+ return 0;
+}
+
+static int hist_entry__callchain_branch_cycles_snprintf(struct hist_entry *he,
+ char *bf, size_t size,
+ unsigned int width)
+{
+ u64 branch_count, cycles_count, cycles = 0;
+ char str[32];
+
+ callchain_branch_counts(he->callchain, &branch_count,
+ NULL, NULL, &cycles_count);
+
+ if (branch_count)
+ cycles = cycles_count / branch_count;
+
+ snprintf(str, sizeof(str), "%" PRId64 "", cycles);
+ return repsep_snprintf(bf, size, "%-*.*s", width, width, str);
+}
+
+struct sort_entry sort_callchain_branch_cycles = {
+ .se_header = "Cycles",
+ .se_cmp = sort__callchain_branch_cycles_cmp,
+ .se_snprintf = hist_entry__callchain_branch_cycles_snprintf,
+ .se_width_idx = HISTC_CALLCHAIN_BRANCH_CYCLES,
+};
+
/* --sort srcfile */

static char no_srcfile[1];
@@ -1435,6 +1535,15 @@ static struct sort_dimension bstack_sort_dimensions[] = {
DIM(SORT_CYCLES, "cycles", sort_cycles),
DIM(SORT_SRCLINE_FROM, "srcline_from", sort_srcline_from),
DIM(SORT_SRCLINE_TO, "srcline_to", sort_srcline_to),
+ DIM(SORT_CALLCHAIN_BRANCH_PREDICTED,
+ "callchain_branch_predicted",
+ sort_callchain_branch_predicted),
+ DIM(SORT_CALLCHAIN_BRANCH_ABORT,
+ "callchain_branch_abort",
+ sort_callchain_branch_abort),
+ DIM(SORT_CALLCHAIN_BRANCH_CYCLES,
+ "callchain_branch_cycles",
+ sort_callchain_branch_cycles),
};

#undef DIM
@@ -2369,7 +2478,13 @@ int sort_dimension__add(struct perf_hpp_list *list, const char *tok,
if (strncasecmp(tok, sd->name, strlen(tok)))
continue;

- if (sort__mode != SORT_MODE__BRANCH)
+ if ((sort__mode != SORT_MODE__BRANCH) &&
+ strncasecmp(tok, "callchain_branch_predicted",
+ strlen(tok)) &&
+ strncasecmp(tok, "callchain_branch_abort",
+ strlen(tok)) &&
+ strncasecmp(tok, "callchain_branch_cycles",
+ strlen(tok)))
return -EINVAL;

if (sd->entry == &sort_sym_from || sd->entry == &sort_sym_to)
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index 7aff317..30c6e97 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -224,6 +224,9 @@ enum sort_type {
SORT_CYCLES,
SORT_SRCLINE_FROM,
SORT_SRCLINE_TO,
+ SORT_CALLCHAIN_BRANCH_PREDICTED,
+ SORT_CALLCHAIN_BRANCH_ABORT,
+ SORT_CALLCHAIN_BRANCH_CYCLES,

/* memory mode specific sort keys */
__SORT_MEMORY_MODE,
--
2.7.4