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      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 }
    123