module/splat/splat-time.c

   1 /*****************************************************************************\
   2  *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
   3  *  Copyright (C) 2007 The Regents of the University of California.
   4  *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
   5  *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
   6  *  UCRL-CODE-235197
   7  *
   8  *  This file is part of the SPL, Solaris Porting Layer.
   9  *  For details, see <http://zfsonlinux.org/>.
  10  *
  11  *  The SPL is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License as published by the
  13  *  Free Software Foundation; either version 2 of the License, or (at your
  14  *  option) any later version.
  15  *
  16  *  The SPL is distributed in the hope that it will be useful, but WITHOUT
  17  *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  18  *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  19  *  for more details.
  20  *
  21  *  You should have received a copy of the GNU General Public License along
  22  *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
  23  *****************************************************************************
  24  *  Solaris Porting LAyer Tests (SPLAT) Time Tests.
  25 \*****************************************************************************/
  26
  27 #include <sys/time.h>
  28 #include <linux/slab.h>
  29 #include "splat-internal.h"
  30
  31 #define SPLAT_TIME_NAME                 "time"
  32 #define SPLAT_TIME_DESC                 "Kernel Time Tests"
  33
  34 #define SPLAT_TIME_TEST1_ID             0x0801
  35 #define SPLAT_TIME_TEST1_NAME           "time1"
  36 #define SPLAT_TIME_TEST1_DESC           "HZ Test"
  37
  38 #define SPLAT_TIME_TEST2_ID             0x0802
  39 #define SPLAT_TIME_TEST2_NAME           "time2"
  40 #define SPLAT_TIME_TEST2_DESC           "Monotonic Test"
  41
  42 static int
  43 splat_time_test1(struct file *file, void *arg)
  44 {
  45         int myhz = hz;
  46         splat_vprint(file, SPLAT_TIME_TEST1_NAME, "hz is %d\n", myhz);
  47         return 0;
  48 }
  49
  50 static int
  51 splat_time_test2(struct file *file, void *arg)
  52 {
  53         hrtime_t tm1, tm2;
  54         int i;
  55
  56         tm1 = gethrtime();
  57         splat_vprint(file, SPLAT_TIME_TEST2_NAME, "time is %lld\n", tm1);
  58
  59         for(i = 0; i < 100; i++) {
  60                 tm2 = gethrtime();
  61                 splat_vprint(file, SPLAT_TIME_TEST2_NAME, "time is %lld\n", tm2);
  62
  63                 if(tm1 > tm2) {
  64                         splat_print(file, "%s: gethrtime() is not giving "
  65                                     "monotonically increasing values\n",
  66                                     SPLAT_TIME_TEST2_NAME);
  67                         return 1;
  68                 }
  69                 tm1 = tm2;
  70
  71                 set_current_state(TASK_INTERRUPTIBLE);
  72                 schedule_timeout(10);
  73         }
  74
  75         return 0;
  76 }
  77
  78 splat_subsystem_t *
  79 splat_time_init(void)
  80 {
  81         splat_subsystem_t *sub;
  82
  83         sub = kmalloc(sizeof(*sub), GFP_KERNEL);
  84         if (sub == NULL)
  85                 return NULL;
  86
  87         memset(sub, 0, sizeof(*sub));
  88         strncpy(sub->desc.name, SPLAT_TIME_NAME, SPLAT_NAME_SIZE);
  89         strncpy(sub->desc.desc, SPLAT_TIME_DESC, SPLAT_DESC_SIZE);
  90         INIT_LIST_HEAD(&sub->subsystem_list);
  91         INIT_LIST_HEAD(&sub->test_list);
  92         spin_lock_init(&sub->test_lock);
  93         sub->desc.id = SPLAT_SUBSYSTEM_TIME;
  94
  95         SPLAT_TEST_INIT(sub, SPLAT_TIME_TEST1_NAME, SPLAT_TIME_TEST1_DESC,
  96                       SPLAT_TIME_TEST1_ID, splat_time_test1);
  97         SPLAT_TEST_INIT(sub, SPLAT_TIME_TEST2_NAME, SPLAT_TIME_TEST2_DESC,
  98                       SPLAT_TIME_TEST2_ID, splat_time_test2);
  99
 100         return sub;
 101 }
 102
 103 void
 104 splat_time_fini(splat_subsystem_t *sub)
 105 {
 106         ASSERT(sub);
 107
 108         SPLAT_TEST_FINI(sub, SPLAT_TIME_TEST2_ID);
 109         SPLAT_TEST_FINI(sub, SPLAT_TIME_TEST1_ID);
 110
 111         kfree(sub);
 112 }
 113
 114 int
 115 splat_time_id(void)
 116 {
 117         return SPLAT_SUBSYSTEM_TIME;
 118 }