t_mincore.c revision 276478 
1/* $NetBSD: t_mincore.c,v 1.8 2012/06/08 07:18:58 martin Exp $ */
2
3/*-
4 * Copyright (c) 2011 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jukka Ruohonen.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*-
33 * Copyright (c) 1999 The NetBSD Foundation, Inc.
34 * All rights reserved.
35 *
36 * This code is derived from software contributed to The NetBSD Foundation
37 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
38 * NASA Ames Research Center.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 *    notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 *    notice, this list of conditions and the following disclaimer in the
47 *    documentation and/or other materials provided with the distribution.
48 *
49 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
50 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
51 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
52 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
53 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
54 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
55 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
56 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
57 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
58 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
59 * POSSIBILITY OF SUCH DAMAGE.
60 */
61#include <sys/cdefs.h>
62__RCSID("$NetBSD: t_mincore.c,v 1.8 2012/06/08 07:18:58 martin Exp $");
63
64#include <sys/mman.h>
65#include <sys/shm.h>
66
67#include <atf-c.h>
68#include <errno.h>
69#include <fcntl.h>
70#include <kvm.h>
71#include <stdio.h>
72#include <stdlib.h>
73#include <string.h>
74#include <unistd.h>
75#include <sys/resource.h>
76
77#ifdef __FreeBSD__
78#include <sys/stat.h>
79#endif
80
81static long		page = 0;
82static const char	path[] = "mincore";
83static size_t		check_residency(void *, size_t);
84
85static size_t
86check_residency(void *addr, size_t npgs)
87{
88	size_t i, resident;
89	char *vec;
90
91	vec = malloc(npgs);
92
93	ATF_REQUIRE(vec != NULL);
94	ATF_REQUIRE(mincore(addr, npgs * page, vec) == 0);
95
96	for (i = resident = 0; i < npgs; i++) {
97
98		if (vec[i] != 0)
99			resident++;
100
101#if 0
102		(void)fprintf(stderr, "page 0x%p is %sresident\n",
103		    (char *)addr + (i * page), vec[i] ? "" : "not ");
104#endif
105	}
106
107	free(vec);
108
109	return resident;
110}
111
112ATF_TC(mincore_err);
113ATF_TC_HEAD(mincore_err, tc)
114{
115	atf_tc_set_md_var(tc, "descr", "Test errors from mincore(2)");
116}
117
118ATF_TC_BODY(mincore_err, tc)
119{
120	char *map, *vec;
121
122	map = mmap(NULL, page, PROT_WRITE, MAP_ANON | MAP_PRIVATE, -1, 0);
123	vec = malloc(page);
124
125	ATF_REQUIRE(vec != NULL);
126	ATF_REQUIRE(map != MAP_FAILED);
127
128#ifdef __NetBSD__
129	errno = 0;
130	ATF_REQUIRE_ERRNO(EINVAL, mincore(map, 0, vec) == -1);
131#endif
132
133	errno = 0;
134	ATF_REQUIRE_ERRNO(ENOMEM, mincore(0, page, vec) == -1);
135
136	errno = 0;
137	ATF_REQUIRE_ERRNO(EFAULT, mincore(map, page, (void *)-1) == -1);
138
139	free(vec);
140	ATF_REQUIRE(munmap(map, page) == 0);
141}
142
143ATF_TC_WITH_CLEANUP(mincore_resid);
144ATF_TC_HEAD(mincore_resid, tc)
145{
146	atf_tc_set_md_var(tc, "descr", "Test page residency with mincore(2)");
147}
148
149ATF_TC_BODY(mincore_resid, tc)
150{
151	void *addr, *addr2, *addr3, *buf;
152	size_t npgs = 0, resident;
153	struct stat st;
154	int fd, rv;
155	struct rlimit rlim;
156
157	ATF_REQUIRE(getrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
158	rlim.rlim_cur = rlim.rlim_max;
159	ATF_REQUIRE(setrlimit(RLIMIT_MEMLOCK, &rlim) == 0);
160
161	(void)memset(&st, 0, sizeof(struct stat));
162
163	fd = open(path, O_RDWR | O_CREAT, 0700);
164	buf = malloc(page * 5);
165
166	ATF_REQUIRE(fd >= 0);
167	ATF_REQUIRE(buf != NULL);
168
169	rv = write(fd, buf, page * 5);
170	ATF_REQUIRE(rv >= 0);
171
172	ATF_REQUIRE(fd >= 0);
173	ATF_REQUIRE(fstat(fd, &st) == 0);
174
175	addr = mmap(NULL, (size_t)st.st_size, PROT_READ,
176	    MAP_FILE | MAP_SHARED, fd, (off_t) 0);
177
178	ATF_REQUIRE(addr != MAP_FAILED);
179
180	(void)close(fd);
181
182	npgs = st.st_size / page;
183
184	if (st.st_size % page != 0)
185		npgs++;
186
187	(void)check_residency(addr, npgs);
188
189	rv = mlock(addr, npgs * page);
190	if (rv == -1 && errno == EAGAIN)
191		atf_tc_skip("hit process resource limits");
192	ATF_REQUIRE(munmap(addr, st.st_size) == 0);
193
194	npgs = 128;
195
196#ifdef __FreeBSD__
197	addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
198	    MAP_ANON | MAP_PRIVATE, -1, (off_t)0);
199#else
200	addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
201	    MAP_ANON | MAP_PRIVATE | MAP_WIRED, -1, (off_t)0);
202#endif
203
204	if (addr == MAP_FAILED)
205		atf_tc_skip("could not mmap wired anonymous test area, system "
206		    "might be low on memory");
207
208#ifdef __FreeBSD__
209	ATF_REQUIRE(mlock(addr, npgs * page) == 0);
210#endif
211	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
212	ATF_REQUIRE(munmap(addr, npgs * page) == 0);
213
214	npgs = 128;
215
216	addr = mmap(NULL, npgs * page, PROT_READ | PROT_WRITE,
217	    MAP_ANON | MAP_PRIVATE, -1, (off_t)0);
218
219	ATF_REQUIRE(addr != MAP_FAILED);
220
221	/*
222	 * Check that the in-core pages match the locked pages.
223	 */
224	ATF_REQUIRE(check_residency(addr, npgs) == 0);
225
226	errno = 0;
227	if (mlockall(MCL_CURRENT|MCL_FUTURE) != 0 && errno != ENOMEM)
228		atf_tc_fail("mlockall(2) failed");
229	if (errno == ENOMEM)
230		atf_tc_skip("mlockall() exceeded process resource limits");
231
232	resident = check_residency(addr, npgs);
233	if (resident < npgs)
234		atf_tc_fail("mlockall(MCL_FUTURE) succeeded, still only "
235		    "%zu pages of the newly mapped %zu pages are resident",
236		    resident, npgs);
237
238	addr2 = mmap(NULL, npgs * page, PROT_READ, MAP_ANON, -1, (off_t)0);
239	addr3 = mmap(NULL, npgs * page, PROT_NONE, MAP_ANON, -1, (off_t)0);
240
241	if (addr2 == MAP_FAILED || addr3 == MAP_FAILED)
242		atf_tc_skip("could not mmap more anonymous test pages with "
243		    "mlockall(MCL_FUTURE) in effect, system "
244		    "might be low on memory");
245
246	ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
247	ATF_REQUIRE(check_residency(addr3, npgs) == 0);
248	ATF_REQUIRE(mprotect(addr3, npgs * page, PROT_READ) == 0);
249	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
250	ATF_REQUIRE(check_residency(addr2, npgs) == npgs);
251
252	(void)munlockall();
253
254	ATF_REQUIRE(madvise(addr2, npgs * page, MADV_FREE) == 0);
255#ifdef __NetBSD__
256	ATF_REQUIRE(check_residency(addr2, npgs) == 0);
257#endif
258
259	(void)memset(addr, 0, npgs * page);
260
261	ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
262#ifdef __NetBSD__
263	ATF_REQUIRE(check_residency(addr, npgs) == 0);
264#endif
265
266	(void)munmap(addr, npgs * page);
267	(void)munmap(addr2, npgs * page);
268	(void)munmap(addr3, npgs * page);
269	(void)unlink(path);
270}
271
272ATF_TC_CLEANUP(mincore_resid, tc)
273{
274	(void)unlink(path);
275}
276
277ATF_TC(mincore_shmseg);
278ATF_TC_HEAD(mincore_shmseg, tc)
279{
280	atf_tc_set_md_var(tc, "descr", "residency of shared memory");
281}
282
283ATF_TC_BODY(mincore_shmseg, tc)
284{
285	size_t npgs = 128;
286	void *addr = NULL;
287	int shmid;
288
289	shmid = shmget(IPC_PRIVATE, npgs * page,
290	    IPC_CREAT | S_IRUSR | S_IWUSR);
291
292	ATF_REQUIRE(shmid != -1);
293
294	addr = shmat(shmid, NULL, 0);
295
296	ATF_REQUIRE(addr != NULL);
297	ATF_REQUIRE(check_residency(addr, npgs) == 0);
298
299	(void)memset(addr, 0xff, npgs * page);
300
301	ATF_REQUIRE(check_residency(addr, npgs) == npgs);
302	ATF_REQUIRE(madvise(addr, npgs * page, MADV_FREE) == 0);
303
304	/*
305	 * NOTE!  Even though we have MADV_FREE'd the range,
306	 * there is another reference (the kernel's) to the
307	 * object which owns the pages.  In this case, the
308	 * kernel does not simply free the pages, as haphazardly
309	 * freeing pages when there are still references to
310	 * an object can cause data corruption (say, the other
311	 * referencer doesn't expect the pages to be freed,
312	 * and is surprised by the subsequent ZFOD).
313	 *
314	 * Because of this, we simply report the number of
315	 * pages still resident, for information only.
316	 */
317	npgs = check_residency(addr, npgs);
318
319	(void)fprintf(stderr, "%zu pages still resident\n", npgs);
320
321	ATF_REQUIRE(shmdt(addr) == 0);
322	ATF_REQUIRE(shmctl(shmid, IPC_RMID, NULL) == 0);
323}
324
325ATF_TP_ADD_TCS(tp)
326{
327
328	page = sysconf(_SC_PAGESIZE);
329	ATF_REQUIRE(page >= 0);
330
331	ATF_TP_ADD_TC(tp, mincore_err);
332	ATF_TP_ADD_TC(tp, mincore_resid);
333	ATF_TP_ADD_TC(tp, mincore_shmseg);
334
335	return atf_no_error();
336}
337