tools/perf/tests/thread-mg-share.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "tests.h"
   3 #include "machine.h"
   4 #include "thread.h"
   5 #include "map.h"
   6 #include "debug.h"
   7
   8 int test__thread_mg_share(struct test *test __maybe_unused, int subtest __maybe_unused)
   9 {
  10         struct machines machines;
  11         struct machine *machine;
  12
  13         /* thread group */
  14         struct thread *leader;
  15         struct thread *t1, *t2, *t3;
  16         struct map_groups *mg;
  17
  18         /* other process */
  19         struct thread *other, *other_leader;
  20         struct map_groups *other_mg;
  21
  22         /*
  23          * This test create 2 processes abstractions (struct thread)
  24          * with several threads and checks they properly share and
  25          * maintain map groups info (struct map_groups).
  26          *
  27          * thread group (pid: 0, tids: 0, 1, 2, 3)
  28          * other  group (pid: 4, tids: 4, 5)
  29         */
  30
  31         machines__init(&machines);
  32         machine = &machines.host;
  33
  34         /* create process with 4 threads */
  35         leader = machine__findnew_thread(machine, 0, 0);
  36         t1     = machine__findnew_thread(machine, 0, 1);
  37         t2     = machine__findnew_thread(machine, 0, 2);
  38         t3     = machine__findnew_thread(machine, 0, 3);
  39
  40         /* and create 1 separated process, without thread leader */
  41         other  = machine__findnew_thread(machine, 4, 5);
  42
  43         TEST_ASSERT_VAL("failed to create threads",
  44                         leader && t1 && t2 && t3 && other);
  45
  46         mg = leader->mg;
  47         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 4);
  48
  49         /* test the map groups pointer is shared */
  50         TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);
  51         TEST_ASSERT_VAL("map groups don't match", mg == t2->mg);
  52         TEST_ASSERT_VAL("map groups don't match", mg == t3->mg);
  53
  54         /*
  55          * Verify the other leader was created by previous call.
  56          * It should have shared map groups with no change in
  57          * refcnt.
  58          */
  59         other_leader = machine__find_thread(machine, 4, 4);
  60         TEST_ASSERT_VAL("failed to find other leader", other_leader);
  61
  62         /*
  63          * Ok, now that all the rbtree related operations were done,
  64          * lets remove all of them from there so that we can do the
  65          * refcounting tests.
  66          */
  67         machine__remove_thread(machine, leader);
  68         machine__remove_thread(machine, t1);
  69         machine__remove_thread(machine, t2);
  70         machine__remove_thread(machine, t3);
  71         machine__remove_thread(machine, other);
  72         machine__remove_thread(machine, other_leader);
  73
  74         other_mg = other->mg;
  75         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_mg->refcnt), 2);
  76
  77         TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
  78
  79         /* release thread group */
  80         thread__put(leader);
  81         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 3);
  82
  83         thread__put(t1);
  84         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 2);
  85
  86         thread__put(t2);
  87         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 1);
  88
  89         thread__put(t3);
  90
  91         /* release other group  */
  92         thread__put(other_leader);
  93         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_mg->refcnt), 1);
  94
  95         thread__put(other);
  96
  97         machines__exit(&machines);
  98         return 0;
  99 }