perf report: Display the branch counter histogram
Reusing the existing --total-cycles option to display the branch
counters. Add a new PERF_HPP_REPORT__BLOCK_BRANCH_COUNTER to display
the logged branch counter events. They are shown right after all the
cycle-related annotations.
Extend the 'struct block_info' to store and pass the branch counter
related information.
The annotation_br_cntr_entry() is to print the histogram of each branch
counter event. If the number of logged events is less than 4, the exact
number of the abbr name is printed. Otherwise, using '+' to stands for
more than 3 events.
Assume the number of logged events is less than 4.
The annotation_br_cntr_abbr_list() prints the branch counter's
abbreviation list. Press 'B' to display the list in the TUI mode.
$ perf record -e "{branch-instructions:ppp,branch-misses}:S" -j any,counter
$ perf report --total-cycles --stdio
# To display the perf.data header info, please use --header/--header-only options.
#
#
# Total Lost Samples: 0
#
# Samples: 1M of events 'anon group { branch-instructions:ppp, branch-misses }'
# Event count (approx.): 1610046
#
# Branch counter abbr list:
# branch-instructions:ppp = A
# branch-misses = B
# '-' No event occurs
# '+' Event occurrences may be lost due to branch counter saturated
#
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles Branch Counter [Program Block Range]
# ............... .............. ........... .......... .............. ..................
#
57.55% 2.5M 0.00% 3 |A |- | ...
25.27% 1.1M 0.00% 2 |AA |- | ...
15.61% 667.2K 0.00% 1 |A |- | ...
0.16% 6.9K 0.81% 575 |A |- | ...
0.16% 6.8K 1.38% 977 |AA |- | ...
0.16% 6.8K 0.04% 28 |AA |B | ...
0.15% 6.6K 1.33% 946 |A |- | ...
0.11% 4.5K 0.06% 46 |AAA+|- | ...
0.10% 4.4K 0.88% 624 |A |- | ...
0.09% 3.7K 0.74% 524 |AAA+|B | ...
With -v applied,
# Sampled Cycles% Sampled Cycles Avg Cycles% Avg Cycles Branch Counter [Program Block Range]
# ............... .............. ........... .......... .............. ..................
#
57.55% 2.5M 0.00% 3 A=1 ,B=- ...
25.27% 1.1M 0.00% 2 A=2 ,B=- ...
15.61% 667.2K 0.00% 1 A=1 ,B=- ...
0.16% 6.9K 0.81% 575 A=1 ,B=- ...
0.16% 6.8K 1.38% 977 A=2 ,B=- ...
0.16% 6.8K 0.04% 28 A=2 ,B=1 ...
0.15% 6.6K 1.33% 946 A=1 ,B=- ...
0.11% 4.5K 0.06% 46 A=3+,B=- ...
0.10% 4.4K 0.88% 624 A=1 ,B=- ...
0.09% 3.7K 0.74% 524 A=3+,B=1 ...
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: https://lore.kernel.org/r/20240813160208.2493643-7-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang
Arnaldo Carvalho de Melo
parent
7398bf181d
commit
20d6f55528
@ -614,6 +614,7 @@ include::itrace.txt[]
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'Avg Cycles%' - block average sampled cycles / sum of total block average
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sampled cycles
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'Avg Cycles' - block average sampled cycles
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'Branch Counter' - block branch counter histogram (with -v showing the number)
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--skip-empty::
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Do not print 0 results in the --stat output.
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@ -691,7 +691,7 @@ static void hists__precompute(struct hists *hists)
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if (compute == COMPUTE_CYCLES) {
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bh = container_of(he, struct block_hist, he);
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init_block_hist(bh);
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block_info__process_sym(he, bh, NULL, 0);
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block_info__process_sym(he, bh, NULL, 0, 0);
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}
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data__for_each_file_new(i, d) {
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@ -714,7 +714,7 @@ static void hists__precompute(struct hists *hists)
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pair_bh = container_of(pair, struct block_hist,
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he);
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init_block_hist(pair_bh);
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block_info__process_sym(pair, pair_bh, NULL, 0);
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block_info__process_sym(pair, pair_bh, NULL, 0, 0);
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bh = container_of(he, struct block_hist, he);
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@ -575,6 +575,13 @@ static int evlist__tty_browse_hists(struct evlist *evlist, struct report *rep, c
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hists__fprintf_nr_sample_events(hists, rep, evname, stdout);
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if (rep->total_cycles_mode) {
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char *buf;
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if (!annotation_br_cntr_abbr_list(&buf, pos, true)) {
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fprintf(stdout, "%s", buf);
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fprintf(stdout, "#\n");
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free(buf);
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}
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report__browse_block_hists(&rep->block_reports[i - 1].hist,
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rep->min_percent, pos, NULL);
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continue;
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@ -1119,18 +1126,23 @@ static int __cmd_report(struct report *rep)
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report__output_resort(rep);
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if (rep->total_cycles_mode) {
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int block_hpps[6] = {
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int nr_hpps = 4;
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int block_hpps[PERF_HPP_REPORT__BLOCK_MAX_INDEX] = {
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PERF_HPP_REPORT__BLOCK_TOTAL_CYCLES_PCT,
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PERF_HPP_REPORT__BLOCK_LBR_CYCLES,
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PERF_HPP_REPORT__BLOCK_CYCLES_PCT,
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PERF_HPP_REPORT__BLOCK_AVG_CYCLES,
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PERF_HPP_REPORT__BLOCK_RANGE,
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PERF_HPP_REPORT__BLOCK_DSO,
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};
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if (session->evlist->nr_br_cntr > 0)
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block_hpps[nr_hpps++] = PERF_HPP_REPORT__BLOCK_BRANCH_COUNTER;
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block_hpps[nr_hpps++] = PERF_HPP_REPORT__BLOCK_RANGE;
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block_hpps[nr_hpps++] = PERF_HPP_REPORT__BLOCK_DSO;
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rep->block_reports = block_info__create_report(session->evlist,
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rep->total_cycles,
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block_hpps, 6,
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block_hpps, nr_hpps,
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&rep->nr_block_reports);
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if (!rep->block_reports)
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return -1;
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@ -3684,8 +3684,10 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
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struct hist_browser *browser;
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int key = -1;
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struct popup_action action;
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char *br_cntr_text = NULL;
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static const char help[] =
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" q Quit \n";
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" q Quit \n"
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" B Branch counter abbr list (Optional)\n";
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browser = hist_browser__new(hists);
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if (!browser)
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@ -3703,6 +3705,8 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
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memset(&action, 0, sizeof(action));
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annotation_br_cntr_abbr_list(&br_cntr_text, evsel, false);
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while (1) {
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key = hist_browser__run(browser, "? - help", true, 0);
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@ -3723,6 +3727,16 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
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action.ms.sym = browser->selection->sym;
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do_annotate(browser, &action);
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continue;
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case 'B':
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if (br_cntr_text) {
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ui__question_window("Branch counter abbr list",
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br_cntr_text, "Press any key...", 0);
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} else {
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ui__question_window("Branch counter abbr list",
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"\n The branch counter is not available.\n",
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"Press any key...", 0);
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}
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continue;
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default:
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break;
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}
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@ -3730,5 +3744,6 @@ int block_hists_tui_browse(struct block_hist *bh, struct evsel *evsel,
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out:
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hist_browser__delete(browser);
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free(br_cntr_text);
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return 0;
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}
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@ -41,6 +41,7 @@
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#include "namespaces.h"
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#include "thread.h"
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#include "hashmap.h"
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#include "strbuf.h"
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#include <regex.h>
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#include <linux/bitops.h>
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#include <linux/kernel.h>
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@ -48,6 +49,7 @@
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#include <linux/zalloc.h>
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#include <subcmd/parse-options.h>
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#include <subcmd/run-command.h>
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#include <math.h>
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/* FIXME: For the HE_COLORSET */
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#include "ui/browser.h"
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@ -1719,6 +1721,149 @@ static void ipc_coverage_string(char *bf, int size, struct annotation *notes)
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ipc, coverage);
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}
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int annotation_br_cntr_abbr_list(char **str, struct evsel *evsel, bool header)
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{
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struct evsel *pos;
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struct strbuf sb;
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if (evsel->evlist->nr_br_cntr <= 0)
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return -ENOTSUP;
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strbuf_init(&sb, /*hint=*/ 0);
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if (header && strbuf_addf(&sb, "# Branch counter abbr list:\n"))
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goto err;
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evlist__for_each_entry(evsel->evlist, pos) {
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if (!(pos->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS))
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continue;
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if (header && strbuf_addf(&sb, "#"))
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goto err;
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if (strbuf_addf(&sb, " %s = %s\n", pos->name, pos->abbr_name))
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goto err;
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}
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if (header && strbuf_addf(&sb, "#"))
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goto err;
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if (strbuf_addf(&sb, " '-' No event occurs\n"))
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goto err;
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if (header && strbuf_addf(&sb, "#"))
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goto err;
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if (strbuf_addf(&sb, " '+' Event occurrences may be lost due to branch counter saturated\n"))
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goto err;
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*str = strbuf_detach(&sb, NULL);
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return 0;
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err:
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strbuf_release(&sb);
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return -ENOMEM;
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}
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/* Assume the branch counter saturated at 3 */
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#define ANNOTATION_BR_CNTR_SATURATION 3
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int annotation_br_cntr_entry(char **str, int br_cntr_nr,
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u64 *br_cntr, int num_aggr,
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struct evsel *evsel)
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{
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struct evsel *pos = evsel ? evlist__first(evsel->evlist) : NULL;
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bool saturated = false;
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int i, j, avg, used;
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struct strbuf sb;
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strbuf_init(&sb, /*hint=*/ 0);
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for (i = 0; i < br_cntr_nr; i++) {
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used = 0;
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avg = ceil((double)(br_cntr[i] & ~ANNOTATION__BR_CNTR_SATURATED_FLAG) /
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(double)num_aggr);
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/*
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* A histogram with the abbr name is displayed by default.
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* With -v, the exact number of branch counter is displayed.
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*/
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if (verbose) {
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evlist__for_each_entry_from(evsel->evlist, pos) {
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if ((pos->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) &&
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(pos->br_cntr_idx == i))
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break;
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}
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if (strbuf_addstr(&sb, pos->abbr_name))
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goto err;
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if (!br_cntr[i]) {
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if (strbuf_addstr(&sb, "=-"))
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goto err;
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} else {
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if (strbuf_addf(&sb, "=%d", avg))
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goto err;
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}
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if (br_cntr[i] & ANNOTATION__BR_CNTR_SATURATED_FLAG) {
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if (strbuf_addch(&sb, '+'))
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goto err;
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} else {
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if (strbuf_addch(&sb, ' '))
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goto err;
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}
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if ((i < br_cntr_nr - 1) && strbuf_addch(&sb, ','))
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goto err;
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continue;
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}
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if (strbuf_addch(&sb, '|'))
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goto err;
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if (!br_cntr[i]) {
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if (strbuf_addch(&sb, '-'))
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goto err;
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used++;
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} else {
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evlist__for_each_entry_from(evsel->evlist, pos) {
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if ((pos->core.attr.branch_sample_type & PERF_SAMPLE_BRANCH_COUNTERS) &&
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(pos->br_cntr_idx == i))
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break;
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}
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if (br_cntr[i] & ANNOTATION__BR_CNTR_SATURATED_FLAG)
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saturated = true;
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for (j = 0; j < avg; j++, used++) {
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/* Print + if the number of logged events > 3 */
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if (j >= ANNOTATION_BR_CNTR_SATURATION) {
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saturated = true;
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break;
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}
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if (strbuf_addstr(&sb, pos->abbr_name))
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goto err;
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}
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if (saturated) {
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if (strbuf_addch(&sb, '+'))
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goto err;
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used++;
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}
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pos = list_next_entry(pos, core.node);
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}
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for (j = used; j < ANNOTATION_BR_CNTR_SATURATION + 1; j++) {
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if (strbuf_addch(&sb, ' '))
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goto err;
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}
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}
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if (!verbose && strbuf_addch(&sb, br_cntr_nr ? '|' : ' '))
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goto err;
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*str = strbuf_detach(&sb, NULL);
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return 0;
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err:
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strbuf_release(&sb);
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return -ENOMEM;
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}
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static void __annotation_line__write(struct annotation_line *al, struct annotation *notes,
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bool first_line, bool current_entry, bool change_color, int width,
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void *obj, unsigned int percent_type,
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@ -553,4 +553,7 @@ int annotate_get_basic_blocks(struct symbol *sym, s64 src, s64 dst,
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void debuginfo_cache__delete(void);
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int annotation_br_cntr_entry(char **str, int br_cntr_nr, u64 *br_cntr,
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int num_aggr, struct evsel *evsel);
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int annotation_br_cntr_abbr_list(char **str, struct evsel *evsel, bool header);
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#endif /* __PERF_ANNOTATE_H */
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@ -40,16 +40,32 @@ static struct block_header_column {
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[PERF_HPP_REPORT__BLOCK_DSO] = {
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.name = "Shared Object",
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.width = 20,
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},
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[PERF_HPP_REPORT__BLOCK_BRANCH_COUNTER] = {
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.name = "Branch Counter",
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.width = 30,
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}
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};
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struct block_info *block_info__new(void)
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static struct block_info *block_info__new(unsigned int br_cntr_nr)
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{
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return zalloc(sizeof(struct block_info));
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struct block_info *bi = zalloc(sizeof(struct block_info));
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if (bi && br_cntr_nr) {
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bi->br_cntr = calloc(br_cntr_nr, sizeof(u64));
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if (!bi->br_cntr) {
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free(bi);
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return NULL;
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}
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}
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return bi;
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}
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void block_info__delete(struct block_info *bi)
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{
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if (bi)
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free(bi->br_cntr);
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free(bi);
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}
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@ -86,7 +102,8 @@ int64_t block_info__cmp(struct perf_hpp_fmt *fmt __maybe_unused,
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static void init_block_info(struct block_info *bi, struct symbol *sym,
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struct cyc_hist *ch, int offset,
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u64 total_cycles)
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u64 total_cycles, unsigned int br_cntr_nr,
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u64 *br_cntr, struct evsel *evsel)
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{
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bi->sym = sym;
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bi->start = ch->start;
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@ -99,10 +116,18 @@ static void init_block_info(struct block_info *bi, struct symbol *sym,
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memcpy(bi->cycles_spark, ch->cycles_spark,
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NUM_SPARKS * sizeof(u64));
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if (br_cntr && br_cntr_nr) {
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bi->br_cntr_nr = br_cntr_nr;
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memcpy(bi->br_cntr, &br_cntr[offset * br_cntr_nr],
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br_cntr_nr * sizeof(u64));
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}
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bi->evsel = evsel;
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}
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int block_info__process_sym(struct hist_entry *he, struct block_hist *bh,
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u64 *block_cycles_aggr, u64 total_cycles)
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u64 *block_cycles_aggr, u64 total_cycles,
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unsigned int br_cntr_nr)
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{
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struct annotation *notes;
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struct cyc_hist *ch;
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@ -125,12 +150,14 @@ int block_info__process_sym(struct hist_entry *he, struct block_hist *bh,
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struct block_info *bi;
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struct hist_entry *he_block;
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bi = block_info__new();
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bi = block_info__new(br_cntr_nr);
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if (!bi)
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return -1;
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init_block_info(bi, he->ms.sym, &ch[i], i,
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total_cycles);
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total_cycles, br_cntr_nr,
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notes->branch->br_cntr,
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hists_to_evsel(he->hists));
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cycles += bi->cycles_aggr / bi->num_aggr;
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he_block = hists__add_entry_block(&bh->block_hists,
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@ -327,6 +354,24 @@ static void init_block_header(struct block_fmt *block_fmt)
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fmt->width = block_column_width;
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}
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static int block_branch_counter_entry(struct perf_hpp_fmt *fmt,
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struct perf_hpp *hpp,
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struct hist_entry *he)
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{
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struct block_fmt *block_fmt = container_of(fmt, struct block_fmt, fmt);
|
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struct block_info *bi = he->block_info;
|
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char *buf;
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int ret;
|
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|
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if (annotation_br_cntr_entry(&buf, bi->br_cntr_nr, bi->br_cntr,
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bi->num_aggr, bi->evsel))
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return 0;
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||||
|
||||
ret = scnprintf(hpp->buf, hpp->size, "%*s", block_fmt->width, buf);
|
||||
free(buf);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void hpp_register(struct block_fmt *block_fmt, int idx,
|
||||
struct perf_hpp_list *hpp_list)
|
||||
{
|
||||
@ -357,6 +402,9 @@ static void hpp_register(struct block_fmt *block_fmt, int idx,
|
||||
case PERF_HPP_REPORT__BLOCK_DSO:
|
||||
fmt->entry = block_dso_entry;
|
||||
break;
|
||||
case PERF_HPP_REPORT__BLOCK_BRANCH_COUNTER:
|
||||
fmt->entry = block_branch_counter_entry;
|
||||
break;
|
||||
default:
|
||||
return;
|
||||
}
|
||||
@ -390,7 +438,7 @@ static void init_block_hist(struct block_hist *bh, struct block_fmt *block_fmts,
|
||||
static int process_block_report(struct hists *hists,
|
||||
struct block_report *block_report,
|
||||
u64 total_cycles, int *block_hpps,
|
||||
int nr_hpps)
|
||||
int nr_hpps, unsigned int br_cntr_nr)
|
||||
{
|
||||
struct rb_node *next = rb_first_cached(&hists->entries);
|
||||
struct block_hist *bh = &block_report->hist;
|
||||
@ -405,7 +453,7 @@ static int process_block_report(struct hists *hists,
|
||||
while (next) {
|
||||
he = rb_entry(next, struct hist_entry, rb_node);
|
||||
block_info__process_sym(he, bh, &block_report->cycles,
|
||||
total_cycles);
|
||||
total_cycles, br_cntr_nr);
|
||||
next = rb_next(&he->rb_node);
|
||||
}
|
||||
|
||||
@ -435,7 +483,7 @@ struct block_report *block_info__create_report(struct evlist *evlist,
|
||||
struct hists *hists = evsel__hists(pos);
|
||||
|
||||
process_block_report(hists, &block_reports[i], total_cycles,
|
||||
block_hpps, nr_hpps);
|
||||
block_hpps, nr_hpps, evlist->nr_br_cntr);
|
||||
i++;
|
||||
}
|
||||
|
||||
|
||||
@ -18,6 +18,9 @@ struct block_info {
|
||||
u64 total_cycles;
|
||||
int num;
|
||||
int num_aggr;
|
||||
int br_cntr_nr;
|
||||
u64 *br_cntr;
|
||||
struct evsel *evsel;
|
||||
};
|
||||
|
||||
struct block_fmt {
|
||||
@ -36,6 +39,7 @@ enum {
|
||||
PERF_HPP_REPORT__BLOCK_AVG_CYCLES,
|
||||
PERF_HPP_REPORT__BLOCK_RANGE,
|
||||
PERF_HPP_REPORT__BLOCK_DSO,
|
||||
PERF_HPP_REPORT__BLOCK_BRANCH_COUNTER,
|
||||
PERF_HPP_REPORT__BLOCK_MAX_INDEX
|
||||
};
|
||||
|
||||
@ -46,7 +50,6 @@ struct block_report {
|
||||
int nr_fmts;
|
||||
};
|
||||
|
||||
struct block_info *block_info__new(void);
|
||||
void block_info__delete(struct block_info *bi);
|
||||
|
||||
int64_t __block_info__cmp(struct hist_entry *left, struct hist_entry *right);
|
||||
@ -55,7 +58,8 @@ int64_t block_info__cmp(struct perf_hpp_fmt *fmt __maybe_unused,
|
||||
struct hist_entry *left, struct hist_entry *right);
|
||||
|
||||
int block_info__process_sym(struct hist_entry *he, struct block_hist *bh,
|
||||
u64 *block_cycles_aggr, u64 total_cycles);
|
||||
u64 *block_cycles_aggr, u64 total_cycles,
|
||||
unsigned int br_cntr_nr);
|
||||
|
||||
struct block_report *block_info__create_report(struct evlist *evlist,
|
||||
u64 total_cycles,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user