by Namhyung Kim

[permalink] [raw]

Subject: [PATCH 12/17] perf report: Add 'typeoff' sort key

The typeoff sort key shows the data type name, offset and the name of
the field. This is useful to see which field in the struct is accessed
most frequently.

$ perf report -s type,typeoff --hierarchy --stdio
...
# Overhead Data Type / Data Type Offset
# ............ ............................
#
...
1.23% struct cfs_rq
0.19% struct cfs_rq +404 (throttle_count)
0.19% struct cfs_rq +0 (load.weight)
0.19% struct cfs_rq +336 (leaf_cfs_rq_list.next)
0.09% struct cfs_rq +272 (propagate)
0.09% struct cfs_rq +196 (removed.nr)
0.09% struct cfs_rq +80 (curr)
0.09% struct cfs_rq +544 (lt_b_children_throttled)
0.06% struct cfs_rq +320 (rq)

Signed-off-by: Namhyung Kim <[email protected]>
---
tools/perf/Documentation/perf-report.txt | 1 +
tools/perf/util/annotate.c | 1 +
tools/perf/util/hist.h | 1 +
tools/perf/util/sort.c | 83 +++++++++++++++++++++++-
tools/perf/util/sort.h | 2 +
5 files changed, 87 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt
index aec34417090b..b57eb51b47aa 100644
--- a/tools/perf/Documentation/perf-report.txt
+++ b/tools/perf/Documentation/perf-report.txt
@@ -119,6 +119,7 @@ OPTIONS
to the previous instruction in cycles. And currently supported only on X86
- simd: Flags describing a SIMD operation. "e" for empty Arm SVE predicate. "p" for partial Arm SVE predicate
- type: Data type of sample memory access.
+ - typeoff: Offset in the data type of sample memory access.

By default, comm, dso and symbol keys are used.
(i.e. --sort comm,dso,symbol)
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 6747779ecef8..f966e8f83c5e 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -3716,6 +3716,7 @@ struct annotated_data_type *hist_entry__get_data_type(struct hist_entry *he)
op_loc->offset,
he->stat.nr_events,
he->stat.period);
+ he->mem_type_off = op_loc->offset;
return mem_type;
}
return NULL;
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 7ebbf427b1ea..18128a49309e 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -83,6 +83,7 @@ enum hist_column {
HISTC_ADDR,
HISTC_SIMD,
HISTC_TYPE,
+ HISTC_TYPE_OFFSET,
HISTC_NR_COLS, /* Last entry */
};

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index a41209e242ae..d78e680d3988 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2153,8 +2153,10 @@ static void sort__type_init(struct hist_entry *he)
return;

he->mem_type = hist_entry__get_data_type(he);
- if (he->mem_type == NULL)
+ if (he->mem_type == NULL) {
he->mem_type = &unknown_type;
+ he->mem_type_off = 0;
+ }
}

static int64_t
@@ -2198,6 +2200,84 @@ struct sort_entry sort_type = {
.se_width_idx = HISTC_TYPE,
};

+/* --sort typeoff */
+
+static int64_t
+sort__typeoff_sort(struct hist_entry *left, struct hist_entry *right)
+{
+ struct annotated_data_type *left_type = left->mem_type;
+ struct annotated_data_type *right_type = right->mem_type;
+ int64_t ret;
+
+ if (!left_type) {
+ sort__type_init(left);
+ left_type = left->mem_type;
+ }
+
+ if (!right_type) {
+ sort__type_init(right);
+ right_type = right->mem_type;
+ }
+
+ ret = strcmp(left_type->self.type_name, right_type->self.type_name);
+ if (ret)
+ return ret;
+ return left->mem_type_off - right->mem_type_off;
+}
+
+static void fill_member_name(char *buf, size_t sz, struct annotated_member *m,
+ int offset, bool first)
+{
+ struct annotated_member *child;
+
+ if (list_empty(&m->children))
+ return;
+
+ list_for_each_entry(child, &m->children, node) {
+ if (child->offset <= offset && offset < child->offset + child->size) {
+ int len = 0;
+
+ /* It can have anonymous struct/union members */
+ if (child->var_name) {
+ len = scnprintf(buf, sz, "%s%s",
+ first ? "" : ".", child->var_name);
+ first = false;
+ }
+
+ fill_member_name(buf + len, sz - len, child, offset, first);
+ return;
+ }
+ }
+}
+
+static int hist_entry__typeoff_snprintf(struct hist_entry *he, char *bf,
+ size_t size, unsigned int width __maybe_unused)
+{
+ struct annotated_data_type *he_type = he->mem_type;
+ char buf[4096];
+
+ buf[0] = '\0';
+ if (list_empty(&he_type->self.children))
+ snprintf(buf, sizeof(buf), "no field");
+ else
+ fill_member_name(buf, sizeof(buf), &he_type->self,
+ he->mem_type_off, true);
+ buf[4095] = '\0';
+
+ return repsep_snprintf(bf, size, "%s %+d (%s)", he_type->self.type_name,
+ he->mem_type_off, buf);
+}
+
+struct sort_entry sort_type_offset = {
+ .se_header = "Data Type Offset",
+ .se_cmp = sort__type_cmp,
+ .se_collapse = sort__typeoff_sort,
+ .se_sort = sort__typeoff_sort,
+ .se_init = sort__type_init,
+ .se_snprintf = hist_entry__typeoff_snprintf,
+ .se_width_idx = HISTC_TYPE_OFFSET,
+};
+

struct sort_dimension {
const char *name;
@@ -2254,6 +2334,7 @@ static struct sort_dimension common_sort_dimensions[] = {
DIM(SORT_GLOBAL_RETIRE_LAT, "retire_lat", sort_global_p_stage_cyc),
DIM(SORT_SIMD, "simd", sort_simd),
DIM(SORT_ANNOTATE_DATA_TYPE, "type", sort_type),
+ DIM(SORT_ANNOTATE_DATA_TYPE_OFFSET, "typeoff", sort_type_offset),
};

#undef DIM
diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index aabf0b8331a3..d806adcc1e1e 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -113,6 +113,7 @@ struct hist_entry {
u64 p_stage_cyc;
u8 cpumode;
u8 depth;
+ int mem_type_off;
struct simd_flags simd_flags;

/* We are added by hists__add_dummy_entry. */
@@ -247,6 +248,7 @@ enum sort_type {
SORT_GLOBAL_RETIRE_LAT,
SORT_SIMD,
SORT_ANNOTATE_DATA_TYPE,
+ SORT_ANNOTATE_DATA_TYPE_OFFSET,

/* branch stack specific sort keys */
__SORT_BRANCH_STACK,
--
2.43.0.472.g3155946c3a-goog