linux-kernel - [PATCH 11/25] perf report: Skip events with null branch stacks

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: Windows password security audit tool. GUI, reports in PDF.

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

Date:	Fri, 25 Sep 2015 16:15:42 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 11/25] perf report: Skip events with null branch stacks

A non-synthesized event might not have a branch stack if branch
stacks have been synthesized (using itrace options).

An example of that is when Intel PT records sched_switch events
for decoding purposes.  Those sched_switch events do not have
branch stacks even though the Intel PT decoder may be synthesizing
other events that do due to the itrace options.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/builtin-report.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 92f7c5a75208..e94e5c7155af 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -163,14 +163,21 @@ static int process_sample_event(struct perf_tool *tool,
 	if (rep->cpu_list && !test_bit(sample->cpu, rep->cpu_bitmap))
 		goto out_put;
 
-	if (sort__mode == SORT_MODE__BRANCH)
+	if (sort__mode == SORT_MODE__BRANCH) {
+		/*
+		 * A non-synthesized event might not have a branch stack if
+		 * branch stacks have been synthesized (using itrace options).
+		 */
+		if (!sample->branch_stack)
+			goto out_put;
 		iter.ops = &hist_iter_branch;
-	else if (rep->mem_mode)
+	} else if (rep->mem_mode) {
 		iter.ops = &hist_iter_mem;
-	else if (symbol_conf.cumulate_callchain)
+	} else if (symbol_conf.cumulate_callchain) {
 		iter.ops = &hist_iter_cumulative;
-	else
+	} else {
 		iter.ops = &hist_iter_normal;
+	}
 
 	if (al.map != NULL)
 		al.map->dso->hit = 1;
-- 
1.9.1

--
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/