linux-kernel - [tip:perf/core] perf session: Don't rely on evlist in pipe mode

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Message-ID: <tip-0973ad97c187e06aece61f685b9c3b2d93290a73@git.kernel.org>
Date:   Tue, 11 Apr 2017 22:41:03 -0700
From:   tip-bot for David Carrillo-Cisneros <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, davidcc@...gle.com,
        peterz@...radead.org, hekuang@...wei.com, tglx@...utronix.de,
        eranian@...gle.com, wangnan0@...wei.com, sque@...omium.org,
        hpa@...or.com, acme@...hat.com, jolsa@...nel.org,
        ak@...ux.intel.com, mhiramat@...nel.org, mingo@...nel.org,
        pjt@...gle.com, alexander.shishkin@...ux.intel.com
Subject: [tip:perf/core] perf session: Don't rely on evlist in pipe mode

Commit-ID:  0973ad97c187e06aece61f685b9c3b2d93290a73
Gitweb:     http://git.kernel.org/tip/0973ad97c187e06aece61f685b9c3b2d93290a73
Author:     David Carrillo-Cisneros <davidcc@...gle.com>
AuthorDate: Mon, 10 Apr 2017 13:14:30 -0700
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 11 Apr 2017 16:22:20 -0300

perf session: Don't rely on evlist in pipe mode

Session sets a number parameters that rely on evlist. These parameters
are not used in pipe-mode and should not be set, since evlist is
unavailable. Fix that.

Signed-off-by: David Carrillo-Cisneros <davidcc@...gle.com>
Acked-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: He Kuang <hekuang@...wei.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Simon Que <sque@...omium.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Wang Nan <wangnan0@...wei.com>
Link: http://lkml.kernel.org/r/20170410201432.24807-6-davidcc@google.com
[ Check if file != NULL in perf_session__new(), like when used by builtin-top.c ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/session.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index a25302b..7b740a7 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -140,8 +140,14 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
 			if (perf_session__open(session) < 0)
 				goto out_close;
 
-			perf_session__set_id_hdr_size(session);
-			perf_session__set_comm_exec(session);
+			/*
+			 * set session attributes that are present in perf.data
+			 * but not in pipe-mode.
+			 */
+			if (!file->is_pipe) {
+				perf_session__set_id_hdr_size(session);
+				perf_session__set_comm_exec(session);
+			}
 		}
 	} else  {
 		session->machines.host.env = &perf_env;
@@ -156,7 +162,11 @@ struct perf_session *perf_session__new(struct perf_data_file *file,
 			pr_warning("Cannot read kernel map\n");
 	}
 
-	if (tool && tool->ordering_requires_timestamps &&
+	/*
+	 * In pipe-mode, evlist is empty until PERF_RECORD_HEADER_ATTR is
+	 * processed, so perf_evlist__sample_id_all is not meaningful here.
+	 */
+	if ((!file || !file->is_pipe) && tool && tool->ordering_requires_timestamps &&
 	    tool->ordered_events && !perf_evlist__sample_id_all(session->evlist)) {
 		dump_printf("WARNING: No sample_id_all support, falling back to unordered processing\n");
 		tool->ordered_events = false;