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

DEFINITIONS

1. test__thread_mg_share

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "tests.h"
   3 #include "machine.h"
   4 #include "thread.h"
   5 #include "debug.h"
   6 
   7 int test__thread_mg_share(struct test *test __maybe_unused, int subtest __maybe_unused)
   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", refcount_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", refcount_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", refcount_read(&mg->refcnt), 3);
  81 
  82         thread__put(t1);
  83         TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 2);
  84 
  85         thread__put(t2);
  86         TEST_ASSERT_EQUAL("wrong refcnt", refcount_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", refcount_read(&other_mg->refcnt), 1);
  93 
  94         thread__put(other);
  95 
  96         machines__exit(&machines);
  97         return 0;
  98 }