tests/rump/kernspace/alloc.c

   1 /*      $NetBSD: alloc.c,v 1.1 2010/06/14 21:06:09 pooka Exp $  */
   2
   3 /*-
   4  * Copyright (c) 2010 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
  17  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
  21  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  23  * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  25  * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  26  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  27  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include <sys/cdefs.h>
  31 #if !defined(lint)
  32 __RCSID("$NetBSD: alloc.c,v 1.1 2010/06/14 21:06:09 pooka Exp $");
  33 #endif /* !lint */
  34
  35 #include <sys/param.h>
  36 #include <sys/condvar.h>
  37 #include <sys/kmem.h>
  38 #include <sys/kthread.h>
  39 #include <sys/mutex.h>
  40 #include <sys/pool.h>
  41 #include <sys/proc.h>
  42
  43 #include <uvm/uvm.h>
  44
  45 #include <rump/rumpuser.h>
  46 #include "kernspace.h"
  47
  48 static void *store[32];
  49 static struct pool pp1, pp2;
  50
  51 static kmutex_t mtx;
  52 static kcondvar_t kcv;
  53 static int curstat;
  54
  55 static void
  56 hthr(void *arg)
  57 {
  58         int i;
  59
  60         mutex_enter(&mtx);
  61         curstat++;
  62         cv_signal(&kcv);
  63
  64         while (curstat < 2)
  65                 cv_wait(&kcv, &mtx);
  66         mutex_exit(&mtx);
  67
  68         /* try to guarantee that the sleep is triggered in PR_WAITOK */
  69         while ((kernel_map->flags & VM_MAP_WANTVA) == 0)
  70                 kpause("take5", false, 1, NULL);
  71
  72         for (i = 0; i < __arraycount(store); i++) {
  73                 pool_put(&pp1, store[i]);
  74         }
  75
  76         kthread_exit(0);
  77 }
  78
  79 void
  80 rumptest_alloc(size_t thelimit)
  81 {
  82         char *c;
  83         int succ, i;
  84
  85         mutex_init(&mtx, MUTEX_DEFAULT, IPL_NONE);
  86         cv_init(&kcv, "venailu");
  87
  88         kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, hthr, NULL, NULL, "h");
  89
  90         pool_init(&pp1, 1024, 0, 0, 0, "vara-allas",
  91             &pool_allocator_nointr, IPL_NONE);
  92         pool_init(&pp2, 1024, 0, 0, 0, "allas",
  93             &pool_allocator_nointr, IPL_NONE);
  94
  95         for (i = 0; i < __arraycount(store); i++) {
  96                 store[i] = pool_get(&pp1, PR_NOWAIT);
  97                 if (store[i] == NULL) {
  98                         panic("pool_get store failed");
  99                 }
 100         }
 101
 102         /* wait until other thread runs */
 103         mutex_enter(&mtx);
 104         while (curstat == 0)
 105                 cv_wait(&kcv, &mtx);
 106         mutex_exit(&mtx);
 107
 108         for (succ = 0;; succ++) {
 109                 if (succ * 1024 > thelimit)
 110                         panic("managed to allocate over limit");
 111                 if ((c = pool_get(&pp2, PR_NOWAIT)) == NULL) {
 112                         mutex_enter(&mtx);
 113                         curstat++;
 114                         cv_signal(&kcv);
 115                         mutex_exit(&mtx);
 116                         if (pool_get(&pp2, PR_WAITOK) == NULL)
 117                                 panic("pool get PR_WAITOK failed");
 118                         break;
 119                 }
 120                 *c = 'a';
 121         }
 122 }