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

   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(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", 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}
  99