linux-kernel - [tip:perf/core] perf tests: Fix map

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>] [day] [month] [year] [list]

Message-ID: <tip-uoqq0fjei90ohhhcboz6ay33@git.kernel.org>
Date:	Thu, 14 May 2015 23:45:54 -0700
From:	tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	fweisbec@...il.com, acme@...hat.com, adrian.hunter@...el.com,
	eranian@...gle.com, hpa@...or.com, bp@...e.de,
	linux-kernel@...r.kernel.org, dsahern@...il.com,
	dzickus@...hat.com, tglx@...utronix.de, jolsa@...hat.com,
	mingo@...nel.org, namhyung@...nel.org
Subject: [tip:perf/core] perf tests: Fix map_groups refcount test

Commit-ID:  8b00f46951bed1edd9c5cb9d9adb62d28bbe7623
Gitweb:     http://git.kernel.org/tip/8b00f46951bed1edd9c5cb9d9adb62d28bbe7623
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Mon, 11 May 2015 18:13:14 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 12 May 2015 09:59:52 -0300

perf tests: Fix map_groups refcount test

When introducing reference counting for struct thread instances I forgot
to remove the synthetic threads from the machine's rbtree so that it
then the threads would have just one reference and thus the
thread__put() replacing the thread__delete() really turns into a
thread__delete() (thread->refcnt == 1 at thread__put() time) and thus
drop the thread->mg refcount, as expected by the this test.

Fix it by calling machine__remove_thread() (the counterpart of
machine__findnew_thread()) on all the synthetic threads after the
checks that involves the rbtree were done.

Before:

  # perf test -v mg
  30: Test thread mg sharing                                 :
  --- start ---
  test child forked, pid 26995
  FAILED tests/thread-mg-share.c:68 wrong refcnt (4 != 3)
  test child finished with -1
  ---- end ----
  Test thread mg sharing: FAILED!
  #

After:

  # perf test mg
  30: Test thread mg sharing: Ok
  #

Fixes: b91fc39f4ad7 ("perf machine: Protect the machine->threads with a rwlock")
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: David Ahern <dsahern@...il.com>
Cc: Don Zickus <dzickus@...hat.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Stephane Eranian <eranian@...gle.com>
Link: http://lkml.kernel.org/n/tip-uoqq0fjei90ohhhcboz6ay33@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/tests/thread-mg-share.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/tools/perf/tests/thread-mg-share.c b/tools/perf/tests/thread-mg-share.c
index 04eccee..c0ed56f 100644
--- a/tools/perf/tests/thread-mg-share.c
+++ b/tools/perf/tests/thread-mg-share.c
@@ -58,6 +58,18 @@ int test__thread_mg_share(void)
 	other_leader = machine__find_thread(machine, 4, 4);
 	TEST_ASSERT_VAL("failed to find other leader", other_leader);
 
+	/*
+	 * Ok, now that all the rbtree related operations were done,
+	 * lets remove all of them from there so that we can do the
+	 * refcounting tests.
+	 */
+	machine__remove_thread(machine, leader);
+	machine__remove_thread(machine, t1);
+	machine__remove_thread(machine, t2);
+	machine__remove_thread(machine, t3);
+	machine__remove_thread(machine, other);
+	machine__remove_thread(machine, other_leader);
+
 	other_mg = other->mg;
 	TEST_ASSERT_EQUAL("wrong refcnt", other_mg->refcnt, 2);
 
@@ -81,11 +93,6 @@ int test__thread_mg_share(void)
 
 	thread__put(other);
 
-	/*
-	 * Cannot call machine__delete_threads(machine) now,
-	 * because we've already released all the threads.
-	 */
-
 	machines__exit(&machines);
 	return 0;
 }
--
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/