forked from mirrors/linux
perf diff: Support hot streams comparison
This patch enables perf-diff with "--stream" option.
"--stream": Enable hot streams comparison
Now let's see example.
perf record -b ... Generate perf.data.old with branch data
perf record -b ... Generate perf.data with branch data
perf diff --stream
[ Matched hot streams ]
hot chain pair 1:
cycles: 1, hits: 27.77% cycles: 1, hits: 9.24%
--------------------------- --------------------------
main div.c:39 main div.c:39
main div.c:44 main div.c:44
hot chain pair 2:
cycles: 34, hits: 20.06% cycles: 27, hits: 16.98%
--------------------------- --------------------------
__random_r random_r.c:360 __random_r random_r.c:360
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:380 __random_r random_r.c:380
__random_r random_r.c:357 __random_r random_r.c:357
__random random.c:293 __random random.c:293
__random random.c:293 __random random.c:293
__random random.c:291 __random random.c:291
__random random.c:291 __random random.c:291
__random random.c:291 __random random.c:291
__random random.c:288 __random random.c:288
rand rand.c:27 rand rand.c:27
rand rand.c:26 rand rand.c:26
rand@plt rand@plt
rand@plt rand@plt
compute_flag div.c:25 compute_flag div.c:25
compute_flag div.c:22 compute_flag div.c:22
main div.c:40 main div.c:40
main div.c:40 main div.c:40
main div.c:39 main div.c:39
hot chain pair 3:
cycles: 9, hits: 4.48% cycles: 6, hits: 4.51%
--------------------------- --------------------------
__random_r random_r.c:360 __random_r random_r.c:360
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:388 __random_r random_r.c:388
__random_r random_r.c:380 __random_r random_r.c:380
[ Hot streams in old perf data only ]
hot chain 1:
cycles: 18, hits: 6.75%
--------------------------
__random_r random_r.c:360
__random_r random_r.c:388
__random_r random_r.c:388
__random_r random_r.c:380
__random_r random_r.c:357
__random random.c:293
__random random.c:293
__random random.c:291
__random random.c:291
__random random.c:291
__random random.c:288
rand rand.c:27
rand rand.c:26
rand@plt
rand@plt
compute_flag div.c:25
compute_flag div.c:22
main div.c:40
hot chain 2:
cycles: 29, hits: 2.78%
--------------------------
compute_flag div.c:22
main div.c:40
main div.c:40
main div.c:39
[ Hot streams in new perf data only ]
hot chain 1:
cycles: 4, hits: 4.54%
--------------------------
main div.c:42
compute_flag div.c:28
hot chain 2:
cycles: 5, hits: 3.51%
--------------------------
main div.c:39
main div.c:44
main div.c:42
compute_flag div.c:28
Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20201009022845.13141-8-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao
Arnaldo Carvalho de Melo
parent
5bbd6bad3b
commit
2a09a84c72
2 changed files with 110 additions and 13 deletions
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@ -182,6 +182,10 @@ OPTIONS
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--tid=::
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Only diff samples for given thread ID (comma separated list).
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--stream::
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Enable hot streams comparison. Stream can be a callchain which is
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aggregated by the branch records from samples.
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COMPARISON
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----------
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The comparison is governed by the baseline file. The baseline perf.data
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@ -25,6 +25,7 @@
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#include "util/map.h"
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#include "util/spark.h"
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#include "util/block-info.h"
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#include "util/stream.h"
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#include <linux/err.h>
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#include <linux/zalloc.h>
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#include <subcmd/pager.h>
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@ -42,6 +43,7 @@ struct perf_diff {
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int range_size;
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int range_num;
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bool has_br_stack;
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bool stream;
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};
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/* Diff command specific HPP columns. */
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@ -72,6 +74,7 @@ struct data__file {
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struct perf_data data;
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int idx;
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struct hists *hists;
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struct evlist_streams *evlist_streams;
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struct diff_hpp_fmt fmt[PERF_HPP_DIFF__MAX_INDEX];
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};
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@ -106,6 +109,7 @@ enum {
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COMPUTE_DELTA_ABS,
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COMPUTE_CYCLES,
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COMPUTE_MAX,
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COMPUTE_STREAM, /* After COMPUTE_MAX to avoid use current compute arrays */
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};
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const char *compute_names[COMPUTE_MAX] = {
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@ -393,6 +397,11 @@ static int diff__process_sample_event(struct perf_tool *tool,
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struct perf_diff *pdiff = container_of(tool, struct perf_diff, tool);
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struct addr_location al;
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struct hists *hists = evsel__hists(evsel);
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struct hist_entry_iter iter = {
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.evsel = evsel,
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.sample = sample,
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.ops = &hist_iter_normal,
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};
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int ret = -1;
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if (perf_time__ranges_skip_sample(pdiff->ptime_range, pdiff->range_num,
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@ -411,14 +420,8 @@ static int diff__process_sample_event(struct perf_tool *tool,
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goto out_put;
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}
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if (compute != COMPUTE_CYCLES) {
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if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
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true)) {
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pr_warning("problem incrementing symbol period, "
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"skipping event\n");
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goto out_put;
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}
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} else {
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switch (compute) {
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case COMPUTE_CYCLES:
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if (!hists__add_entry_ops(hists, &block_hist_ops, &al, NULL,
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NULL, NULL, sample, true)) {
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pr_warning("problem incrementing symbol period, "
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@ -428,6 +431,23 @@ static int diff__process_sample_event(struct perf_tool *tool,
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hist__account_cycles(sample->branch_stack, &al, sample, false,
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NULL);
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break;
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case COMPUTE_STREAM:
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if (hist_entry_iter__add(&iter, &al, PERF_MAX_STACK_DEPTH,
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NULL)) {
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pr_debug("problem adding hist entry, skipping event\n");
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goto out_put;
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}
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break;
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default:
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if (!hists__add_entry(hists, &al, NULL, NULL, NULL, sample,
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true)) {
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pr_warning("problem incrementing symbol period, "
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"skipping event\n");
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goto out_put;
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}
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}
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/*
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@ -996,10 +1016,55 @@ static void data_process(void)
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}
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}
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static int process_base_stream(struct data__file *data_base,
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struct data__file *data_pair,
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const char *title __maybe_unused)
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{
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struct evlist *evlist_base = data_base->session->evlist;
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struct evlist *evlist_pair = data_pair->session->evlist;
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struct evsel *evsel_base, *evsel_pair;
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struct evsel_streams *es_base, *es_pair;
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evlist__for_each_entry(evlist_base, evsel_base) {
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evsel_pair = evsel_match(evsel_base, evlist_pair);
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if (!evsel_pair)
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continue;
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es_base = evsel_streams__entry(data_base->evlist_streams,
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evsel_base->idx);
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if (!es_base)
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return -1;
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es_pair = evsel_streams__entry(data_pair->evlist_streams,
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evsel_pair->idx);
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if (!es_pair)
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return -1;
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evsel_streams__match(es_base, es_pair);
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evsel_streams__report(es_base, es_pair);
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}
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return 0;
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}
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static void stream_process(void)
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{
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/*
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* Stream comparison only supports two data files.
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* perf.data.old and perf.data. data__files[0] is perf.data.old,
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* data__files[1] is perf.data.
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*/
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process_base_stream(&data__files[0], &data__files[1],
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"# Output based on old perf data:\n#\n");
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}
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static void data__free(struct data__file *d)
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{
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int col;
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if (d->evlist_streams)
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evlist_streams__delete(d->evlist_streams);
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for (col = 0; col < PERF_HPP_DIFF__MAX_INDEX; col++) {
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struct diff_hpp_fmt *fmt = &d->fmt[col];
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@ -1153,8 +1218,18 @@ static int __cmd_diff(void)
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if (pdiff.ptime_range)
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zfree(&pdiff.ptime_range);
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if (compute == COMPUTE_STREAM) {
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d->evlist_streams = evlist__create_streams(
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d->session->evlist, 5);
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if (!d->evlist_streams)
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goto out_delete;
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}
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}
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if (compute == COMPUTE_STREAM)
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stream_process();
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else
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data_process();
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out_delete:
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@ -1228,6 +1303,8 @@ static const struct option options[] = {
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"only consider symbols in these pids"),
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OPT_STRING(0, "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
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"only consider symbols in these tids"),
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OPT_BOOLEAN(0, "stream", &pdiff.stream,
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"Enable hot streams comparison."),
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OPT_END()
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};
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@ -1887,6 +1964,9 @@ int cmd_diff(int argc, const char **argv)
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if (cycles_hist && (compute != COMPUTE_CYCLES))
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usage_with_options(diff_usage, options);
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if (pdiff.stream)
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compute = COMPUTE_STREAM;
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symbol__annotation_init();
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if (symbol__init(NULL) < 0)
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@ -1898,13 +1978,26 @@ int cmd_diff(int argc, const char **argv)
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if (check_file_brstack() < 0)
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return -1;
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if (compute == COMPUTE_CYCLES && !pdiff.has_br_stack)
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if ((compute == COMPUTE_CYCLES || compute == COMPUTE_STREAM)
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&& !pdiff.has_br_stack) {
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return -1;
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}
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if (compute == COMPUTE_STREAM) {
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symbol_conf.show_branchflag_count = true;
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symbol_conf.disable_add2line_warn = true;
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callchain_param.mode = CHAIN_FLAT;
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callchain_param.key = CCKEY_SRCLINE;
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callchain_param.branch_callstack = 1;
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symbol_conf.use_callchain = true;
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callchain_register_param(&callchain_param);
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sort_order = "srcline,symbol,dso";
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} else {
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if (ui_init() < 0)
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return -1;
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sort__mode = SORT_MODE__DIFF;
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}
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if (setup_sorting(NULL) < 0)
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usage_with_options(diff_usage, options);
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