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Linux/tools/testing/selftests/vm/thuge-gen.c

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  1 /* Test selecting other page sizes for mmap/shmget.
  2 
  3    Before running this huge pages for each huge page size must have been
  4    reserved.
  5    For large pages beyond MAX_ORDER (like 1GB on x86) boot options must be used.
  6    Also shmmax must be increased.
  7    And you need to run as root to work around some weird permissions in shm.
  8    And nothing using huge pages should run in parallel.
  9    When the program aborts you may need to clean up the shm segments with
 10    ipcrm -m by hand, like this
 11    sudo ipcs | awk '$1 == "0x00000000" {print $2}' | xargs -n1 sudo ipcrm -m
 12    (warning this will remove all if someone else uses them) */
 13 
 14 #define _GNU_SOURCE 1
 15 #include <sys/mman.h>
 16 #include <stdlib.h>
 17 #include <stdio.h>
 18 #include <sys/ipc.h>
 19 #include <sys/shm.h>
 20 #include <sys/stat.h>
 21 #include <glob.h>
 22 #include <assert.h>
 23 #include <unistd.h>
 24 #include <stdarg.h>
 25 #include <string.h>
 26 
 27 #define err(x) perror(x), exit(1)
 28 
 29 #define MAP_HUGE_2MB    (21 << MAP_HUGE_SHIFT)
 30 #define MAP_HUGE_1GB    (30 << MAP_HUGE_SHIFT)
 31 #define MAP_HUGE_SHIFT  26
 32 #define MAP_HUGE_MASK   0x3f
 33 #define MAP_HUGETLB     0x40000
 34 
 35 #define SHM_HUGETLB     04000   /* segment will use huge TLB pages */
 36 #define SHM_HUGE_SHIFT  26
 37 #define SHM_HUGE_MASK   0x3f
 38 #define SHM_HUGE_2MB    (21 << SHM_HUGE_SHIFT)
 39 #define SHM_HUGE_1GB    (30 << SHM_HUGE_SHIFT)
 40 
 41 #define NUM_PAGESIZES   5
 42 
 43 #define NUM_PAGES 4
 44 
 45 #define Dprintf(fmt...) // printf(fmt)
 46 
 47 unsigned long page_sizes[NUM_PAGESIZES];
 48 int num_page_sizes;
 49 
 50 int ilog2(unsigned long v)
 51 {
 52         int l = 0;
 53         while ((1UL << l) < v)
 54                 l++;
 55         return l;
 56 }
 57 
 58 void find_pagesizes(void)
 59 {
 60         glob_t g;
 61         int i;
 62         glob("/sys/kernel/mm/hugepages/hugepages-*kB", 0, NULL, &g);
 63         assert(g.gl_pathc <= NUM_PAGESIZES);
 64         for (i = 0; i < g.gl_pathc; i++) {
 65                 sscanf(g.gl_pathv[i], "/sys/kernel/mm/hugepages/hugepages-%lukB",
 66                                 &page_sizes[i]);
 67                 page_sizes[i] <<= 10;
 68                 printf("Found %luMB\n", page_sizes[i] >> 20);
 69         }
 70         num_page_sizes = g.gl_pathc;
 71         globfree(&g);
 72 }
 73 
 74 unsigned long default_huge_page_size(void)
 75 {
 76         unsigned long hps = 0;
 77         char *line = NULL;
 78         size_t linelen = 0;
 79         FILE *f = fopen("/proc/meminfo", "r");
 80         if (!f)
 81                 return 0;
 82         while (getline(&line, &linelen, f) > 0) {
 83                 if (sscanf(line, "Hugepagesize:       %lu kB", &hps) == 1) {
 84                         hps <<= 10;
 85                         break;
 86                 }
 87         }
 88         free(line);
 89         return hps;
 90 }
 91 
 92 void show(unsigned long ps)
 93 {
 94         char buf[100];
 95         if (ps == getpagesize())
 96                 return;
 97         printf("%luMB: ", ps >> 20);
 98         fflush(stdout);
 99         snprintf(buf, sizeof buf,
100                 "cat /sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages",
101                 ps >> 10);
102         system(buf);
103 }
104 
105 unsigned long read_sysfs(int warn, char *fmt, ...)
106 {
107         char *line = NULL;
108         size_t linelen = 0;
109         char buf[100];
110         FILE *f;
111         va_list ap;
112         unsigned long val = 0;
113 
114         va_start(ap, fmt);
115         vsnprintf(buf, sizeof buf, fmt, ap);
116         va_end(ap);
117 
118         f = fopen(buf, "r");
119         if (!f) {
120                 if (warn)
121                         printf("missing %s\n", buf);
122                 return 0;
123         }
124         if (getline(&line, &linelen, f) > 0) {
125                 sscanf(line, "%lu", &val);
126         }
127         fclose(f);
128         free(line);
129         return val;
130 }
131 
132 unsigned long read_free(unsigned long ps)
133 {
134         return read_sysfs(ps != getpagesize(),
135                         "/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages",
136                         ps >> 10);
137 }
138 
139 void test_mmap(unsigned long size, unsigned flags)
140 {
141         char *map;
142         unsigned long before, after;
143         int err;
144 
145         before = read_free(size);
146         map = mmap(NULL, size*NUM_PAGES, PROT_READ|PROT_WRITE,
147                         MAP_PRIVATE|MAP_ANONYMOUS|MAP_HUGETLB|flags, 0, 0);
148 
149         if (map == (char *)-1) err("mmap");
150         memset(map, 0xff, size*NUM_PAGES);
151         after = read_free(size);
152         Dprintf("before %lu after %lu diff %ld size %lu\n",
153                 before, after, before - after, size);
154         assert(size == getpagesize() || (before - after) == NUM_PAGES);
155         show(size);
156         err = munmap(map, size);
157         assert(!err);
158 }
159 
160 void test_shmget(unsigned long size, unsigned flags)
161 {
162         int id;
163         unsigned long before, after;
164         int err;
165 
166         before = read_free(size);
167         id = shmget(IPC_PRIVATE, size * NUM_PAGES, IPC_CREAT|0600|flags);
168         if (id < 0) err("shmget");
169 
170         struct shm_info i;
171         if (shmctl(id, SHM_INFO, (void *)&i) < 0) err("shmctl");
172         Dprintf("alloc %lu res %lu\n", i.shm_tot, i.shm_rss);
173 
174 
175         Dprintf("id %d\n", id);
176         char *map = shmat(id, NULL, 0600);
177         if (map == (char*)-1) err("shmat");
178 
179         shmctl(id, IPC_RMID, NULL);
180 
181         memset(map, 0xff, size*NUM_PAGES);
182         after = read_free(size);
183 
184         Dprintf("before %lu after %lu diff %ld size %lu\n",
185                 before, after, before - after, size);
186         assert(size == getpagesize() || (before - after) == NUM_PAGES);
187         show(size);
188         err = shmdt(map);
189         assert(!err);
190 }
191 
192 void sanity_checks(void)
193 {
194         int i;
195         unsigned long largest = getpagesize();
196 
197         for (i = 0; i < num_page_sizes; i++) {
198                 if (page_sizes[i] > largest)
199                         largest = page_sizes[i];
200 
201                 if (read_free(page_sizes[i]) < NUM_PAGES) {
202                         printf("Not enough huge pages for page size %lu MB, need %u\n",
203                                 page_sizes[i] >> 20,
204                                 NUM_PAGES);
205                         exit(0);
206                 }
207         }
208 
209         if (read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest) {
210                 printf("Please do echo %lu > /proc/sys/kernel/shmmax", largest * NUM_PAGES);
211                 exit(0);
212         }
213 
214 #if defined(__x86_64__)
215         if (largest != 1U<<30) {
216                 printf("No GB pages available on x86-64\n"
217                        "Please boot with hugepagesz=1G hugepages=%d\n", NUM_PAGES);
218                 exit(0);
219         }
220 #endif
221 }
222 
223 int main(void)
224 {
225         int i;
226         unsigned default_hps = default_huge_page_size();
227 
228         find_pagesizes();
229 
230         sanity_checks();
231 
232         for (i = 0; i < num_page_sizes; i++) {
233                 unsigned long ps = page_sizes[i];
234                 int arg = ilog2(ps) << MAP_HUGE_SHIFT;
235                 printf("Testing %luMB mmap with shift %x\n", ps >> 20, arg);
236                 test_mmap(ps, MAP_HUGETLB | arg);
237         }
238         printf("Testing default huge mmap\n");
239         test_mmap(default_hps, SHM_HUGETLB);
240 
241         puts("Testing non-huge shmget");
242         test_shmget(getpagesize(), 0);
243 
244         for (i = 0; i < num_page_sizes; i++) {
245                 unsigned long ps = page_sizes[i];
246                 int arg = ilog2(ps) << SHM_HUGE_SHIFT;
247                 printf("Testing %luMB shmget with shift %x\n", ps >> 20, arg);
248                 test_shmget(ps, SHM_HUGETLB | arg);
249         }
250         puts("default huge shmget");
251         test_shmget(default_hps, SHM_HUGETLB);
252 
253         return 0;
254 }
255 

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