linux-kernel - [tip:perf/urgent] perf db-export: Export main_thread in db_export_

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]

Message-ID: <tip-19207d86940db9dad5f2e0a270a2490f7da451e3@git.kernel.org>
Date:   Wed, 17 Jul 2019 15:53:25 -0700
From:   tip-bot for Adrian Hunter <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, adrian.hunter@...el.com, hpa@...or.com,
        acme@...hat.com, jolsa@...hat.com, linux-kernel@...r.kernel.org,
        tglx@...utronix.de
Subject: [tip:perf/urgent] perf db-export: Export main_thread in
 db_export__sample()

Commit-ID:  19207d86940db9dad5f2e0a270a2490f7da451e3
Gitweb:     https://git.kernel.org/tip/19207d86940db9dad5f2e0a270a2490f7da451e3
Author:     Adrian Hunter <adrian.hunter@...el.com>
AuthorDate: Wed, 10 Jul 2019 11:57:53 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 10 Jul 2019 12:12:05 -0300

perf db-export: Export main_thread in db_export__sample()

Export main_thread in db_export__sample() because it makes the code
easier to understand, and prepares db_export__thread() for further
simplification.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Link: http://lkml.kernel.org/r/20190710085810.1650-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/db-export.c | 30 ++++++++++++++++++------------
 1 file changed, 18 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/db-export.c b/tools/perf/util/db-export.c
index 14501236c046..63f9edf65eee 100644
--- a/tools/perf/util/db-export.c
+++ b/tools/perf/util/db-export.c
@@ -71,16 +71,10 @@ int db_export__thread(struct db_export *dbe, struct thread *thread,
 	thread->db_id = ++dbe->thread_last_db_id;
 
 	if (main_thread) {
-		if (main_thread != thread) {
-			err = db_export__thread(dbe, main_thread, machine,
-						comm, main_thread);
+		if (main_thread != thread && comm) {
+			err = db_export__comm_thread(dbe, comm, thread);
 			if (err)
 				return err;
-			if (comm) {
-				err = db_export__comm_thread(dbe, comm, thread);
-				if (err)
-					return err;
-			}
 		}
 		main_thread_db_id = main_thread->db_id;
 	}
@@ -308,12 +302,24 @@ int db_export__sample(struct db_export *dbe, union perf_event *event,
 		return err;
 
 	main_thread = thread__main_thread(al->machine, thread);
-	if (main_thread)
+	if (main_thread) {
 		comm = machine__thread_exec_comm(al->machine, main_thread);
+		/*
+		 * A thread has a reference to the main thread, so export the
+		 * main thread first.
+		 */
+		err = db_export__thread(dbe, main_thread, al->machine, comm,
+					main_thread);
+		if (err)
+			goto out_put;
+	}
 
-	err = db_export__thread(dbe, thread, al->machine, comm, main_thread);
-	if (err)
-		goto out_put;
+	if (thread != main_thread) {
+		err = db_export__thread(dbe, thread, al->machine, comm,
+					main_thread);
+		if (err)
+			goto out_put;
+	}
 
 	if (comm) {
 		err = db_export__exec_comm(dbe, comm, main_thread);