modules/splat/splat-time.c

   1 /*
   2  *  This file is part of the SPL: Solaris Porting Layer.
   3  *
   4  *  Copyright (c) 2008 Lawrence Livermore National Security, LLC.
   5  *  Produced at Lawrence Livermore National Laboratory
   6  *  Written by:
   7  *          Brian Behlendorf <behlendorf1@llnl.gov>,
   8  *          Herb Wartens <wartens2@llnl.gov>,
   9  *          Jim Garlick <garlick@llnl.gov>
  10  *  UCRL-CODE-235197
  11  *
  12  *  This is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License as published by
  14  *  the Free Software Foundation; either version 2 of the License, or
  15  *  (at your option) any later version.
  16  *
  17  *  This is distributed in the hope that it will be useful, but WITHOUT
  18  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  *  for more details.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA.
  25  */
  26
  27 #include "splat-internal.h"
  28
  29 #define SPLAT_SUBSYSTEM_TIME            0x0800
  30 #define SPLAT_TIME_NAME                 "time"
  31 #define SPLAT_TIME_DESC                 "Kernel Time Tests"
  32
  33 #define SPLAT_TIME_TEST1_ID             0x0801
  34 #define SPLAT_TIME_TEST1_NAME           "time1"
  35 #define SPLAT_TIME_TEST1_DESC           "HZ Test"
  36
  37 #define SPLAT_TIME_TEST2_ID             0x0802
  38 #define SPLAT_TIME_TEST2_NAME           "time2"
  39 #define SPLAT_TIME_TEST2_DESC           "Monotonic Test"
  40
  41 static int
  42 splat_time_test1(struct file *file, void *arg)
  43 {
  44         int myhz = hz;
  45         splat_vprint(file, SPLAT_TIME_TEST1_NAME, "hz is %d\n", myhz);
  46         return 0;
  47 }
  48
  49 static int
  50 splat_time_test2(struct file *file, void *arg)
  51 {
  52         hrtime_t tm1, tm2;
  53         int i;
  54
  55         tm1 = gethrtime();
  56         splat_vprint(file, SPLAT_TIME_TEST2_NAME, "time is %lld\n", tm1);
  57
  58         for(i = 0; i < 100; i++) {
  59                 tm2 = gethrtime();
  60                 splat_vprint(file, SPLAT_TIME_TEST2_NAME, "time is %lld\n", tm2);
  61
  62                 if(tm1 > tm2) {
  63                         splat_print(file, "%s: gethrtime() is not giving "
  64                                     "monotonically increasing values\n",
  65                                     SPLAT_TIME_TEST2_NAME);
  66                         return 1;
  67                 }
  68                 tm1 = tm2;
  69
  70                 set_current_state(TASK_INTERRUPTIBLE);
  71                 schedule_timeout(10);
  72         }
  73
  74         return 0;
  75 }
  76
  77 splat_subsystem_t *
  78 splat_time_init(void)
  79 {
  80         splat_subsystem_t *sub;
  81
  82         sub = kmalloc(sizeof(*sub), GFP_KERNEL);
  83         if (sub == NULL)
  84                 return NULL;
  85
  86         memset(sub, 0, sizeof(*sub));
  87         strncpy(sub->desc.name, SPLAT_TIME_NAME, SPLAT_NAME_SIZE);
  88         strncpy(sub->desc.desc, SPLAT_TIME_DESC, SPLAT_DESC_SIZE);
  89         INIT_LIST_HEAD(&sub->subsystem_list);
  90         INIT_LIST_HEAD(&sub->test_list);
  91         spin_lock_init(&sub->test_lock);
  92         sub->desc.id = SPLAT_SUBSYSTEM_TIME;
  93
  94         SPLAT_TEST_INIT(sub, SPLAT_TIME_TEST1_NAME, SPLAT_TIME_TEST1_DESC,
  95                       SPLAT_TIME_TEST1_ID, splat_time_test1);
  96         SPLAT_TEST_INIT(sub, SPLAT_TIME_TEST2_NAME, SPLAT_TIME_TEST2_DESC,
  97                       SPLAT_TIME_TEST2_ID, splat_time_test2);
  98
  99         return sub;
 100 }
 101
 102 void
 103 splat_time_fini(splat_subsystem_t *sub)
 104 {
 105         ASSERT(sub);
 106
 107         SPLAT_TEST_FINI(sub, SPLAT_TIME_TEST2_ID);
 108         SPLAT_TEST_FINI(sub, SPLAT_TIME_TEST1_ID);
 109
 110         kfree(sub);
 111 }
 112
 113 int
 114 splat_time_id(void)
 115 {
 116         return SPLAT_SUBSYSTEM_TIME;
 117 }