LXR linux/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
   8int 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}
 100