linux-kernel - [PATCH 4/9] perf, tools, report: Add processing for cycle histograms

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1437233094-12844-5-git-send-email-andi@firstfloor.org>
Date:	Sat, 18 Jul 2015 08:24:49 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	acme@...nel.org
Cc:	jolsa@...nel.org, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 4/9] perf, tools, report: Add processing for cycle histograms

From: Andi Kleen <ak@...ux.intel.com>

Call the earlier added cycle histogram infrastructure from the perf report
hist iter callback. For this we walk the branch records.

This allows to use cycle histograms when browsing perf report annotate.

v2: Rename flag
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/builtin-report.c |  3 +++
 tools/perf/util/hist.c      | 33 +++++++++++++++++++++++++++++++++
 tools/perf/util/hist.h      |  3 +++
 3 files changed, 39 insertions(+)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 3ba0e97..3a9d1b6 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -103,6 +103,9 @@ static int hist_iter__report_callback(struct hist_entry_iter *iter,
 	if (!ui__has_annotation())
 		return 0;
 
+	hist__account_cycles(iter->sample->branch_stack, al, iter->sample,
+			     rep->nonany_branch_mode);
+
 	if (sort__mode == SORT_MODE__BRANCH) {
 		bi = he->branch_info;
 		err = addr_map_symbol__inc_samples(&bi->from, evsel->idx);
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 54fc003..a6e9ddd 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1415,6 +1415,39 @@ int hists__link(struct hists *leader, struct hists *other)
 	return 0;
 }
 
+void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
+			  struct perf_sample *sample, bool nonany_branch_mode)
+{
+	struct branch_info *bi;
+
+	/* If we have branch cycles always annotate them. */
+	if (bs && bs->nr && bs->entries[0].flags.cycles) {
+		int i;
+
+		bi = sample__resolve_bstack(sample, al);
+		if (bi) {
+			struct addr_map_symbol *prev = NULL;
+
+			/*
+			 * Ignore errors, still want to process the
+			 * other entries.
+			 *
+			 * For non standard branch modes always
+			 * force no IPC (prev == NULL)
+			 *
+			 * Note that perf stores branches reversed from
+			 * program order!
+			 */
+			for (i = bs->nr - 1; i >= 0; i--) {
+				addr_map_symbol__account_cycles(&bi[i].from,
+					nonany_branch_mode ? NULL : prev,
+					bi[i].flags.cycles);
+				prev = &bi[i].to;
+			}
+			free(bi);
+		}
+	}
+}
 
 size_t perf_evlist__fprintf_nr_events(struct perf_evlist *evlist, FILE *fp)
 {
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 3881d98..e2f712f 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -350,6 +350,9 @@ static inline int script_browse(const char *script_opt __maybe_unused)
 
 unsigned int hists__sort_list_width(struct hists *hists);
 
+void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
+			  struct perf_sample *sample, bool nonany_branch_mode);
+
 struct option;
 int parse_filter_percentage(const struct option *opt __maybe_unused,
 			    const char *arg, int unset __maybe_unused);
-- 
2.4.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/