tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#include "tests.h"
2#include "machine.h"
3#include "thread.h"
4#include "map.h"
5#include "debug.h"
6
7int test__thread_mg_share(void)
8{
9 struct machines machines;
10 struct machine *machine;
11
12 /* thread group */
13 struct thread *leader;
14 struct thread *t1, *t2, *t3;
15 struct map_groups *mg;
16
17 /* other process */
18 struct thread *other, *other_leader;
19 struct map_groups *other_mg;
20
21 /*
22 * This test create 2 processes abstractions (struct thread)
23 * with several threads and checks they properly share and
24 * maintain map groups info (struct map_groups).
25 *
26 * thread group (pid: 0, tids: 0, 1, 2, 3)
27 * other group (pid: 4, tids: 4, 5)
28 */
29
30 machines__init(&machines);
31 machine = &machines.host;
32
33 /* create process with 4 threads */
34 leader = machine__findnew_thread(machine, 0, 0);
35 t1 = machine__findnew_thread(machine, 0, 1);
36 t2 = machine__findnew_thread(machine, 0, 2);
37 t3 = machine__findnew_thread(machine, 0, 3);
38
39 /* and create 1 separated process, without thread leader */
40 other = machine__findnew_thread(machine, 4, 5);
41
42 TEST_ASSERT_VAL("failed to create threads",
43 leader && t1 && t2 && t3 && other);
44
45 mg = leader->mg;
46 TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 4);
47
48 /* test the map groups pointer is shared */
49 TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);
50 TEST_ASSERT_VAL("map groups don't match", mg == t2->mg);
51 TEST_ASSERT_VAL("map groups don't match", mg == t3->mg);
52
53 /*
54 * Verify the other leader was created by previous call.
55 * It should have shared map groups with no change in
56 * refcnt.
57 */
58 other_leader = machine__find_thread(machine, 4, 4);
59 TEST_ASSERT_VAL("failed to find other leader", other_leader);
60
61 /*
62 * Ok, now that all the rbtree related operations were done,
63 * lets remove all of them from there so that we can do the
64 * refcounting tests.
65 */
66 machine__remove_thread(machine, leader);
67 machine__remove_thread(machine, t1);
68 machine__remove_thread(machine, t2);
69 machine__remove_thread(machine, t3);
70 machine__remove_thread(machine, other);
71 machine__remove_thread(machine, other_leader);
72
73 other_mg = other->mg;
74 TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 2);
75
76 TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
77
78 /* release thread group */
79 thread__put(leader);
80 TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 3);
81
82 thread__put(t1);
83 TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 2);
84
85 thread__put(t2);
86 TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 1);
87
88 thread__put(t3);
89
90 /* release other group */
91 thread__put(other_leader);
92 TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 1);
93
94 thread__put(other);
95
96 machines__exit(&machines);
97 return 0;
98}