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When referring to memory mapping, one is usually referring to mmap(2). There are 2 categories for using mmap. One category is SHARED vs PRIVATE mappings. The other category is FILE vs ANONYMOUS mappings. Mixed together you get the 4 following combinations: 1. PRIVATE FILE MAPPING 2. SHARED FILE MAPPING 3. PRIVATE ANONYMOUS MAPPING 4. SHARED ANONYMOUS MAPPING Add a memory mapping tool to support the above four scenarios. Updates numa_stress with mmap tool. Signed-off-by: zhenyzha <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| #include <stdio.h> | ||
| #include <stdlib.h> | ||
| #include <unistd.h> | ||
| #include <string.h> | ||
| #include <sys/types.h> | ||
| #include <sys/stat.h> | ||
| #include <fcntl.h> | ||
| #include <sys/mman.h> | ||
| #include <errno.h> | ||
| #include <pthread.h> | ||
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| void *thread_body(void *arg) { | ||
| printf("thread: pid = %d, thread_id = %lu\n", getpid(), pthread_self()); | ||
| return NULL; | ||
| } | ||
| struct mmap_struct { | ||
| int page_size; | ||
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| int fd; | ||
| int flags; | ||
| void *buf; | ||
| unsigned long len; | ||
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| int key_break; | ||
| }; | ||
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| #define MMAP_DEFAULT_SIZE 0x200000 /* 2MB */ | ||
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| static int util_misc_key_press(int enable, const char *prefix, const char *desc) | ||
| { | ||
| int c; | ||
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| if (!enable) | ||
| return 0; | ||
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| fprintf(stdout, "%s%s\n", prefix, desc); | ||
| scanf("%c", &c); | ||
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| return c; | ||
| } | ||
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| static unsigned long util_memory_parse_size(char *args) | ||
| { | ||
| char *nptr, *p = NULL; | ||
| unsigned long factor = 1, size = 0; | ||
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| if (!strlen(args)) | ||
| return 0; | ||
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| nptr = (char *)malloc(strlen(args) + 1); | ||
| if (!nptr) | ||
| return 0; | ||
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| memset(nptr, 0, strlen(args) + 1); | ||
| strcpy(nptr, args); | ||
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| if ((p = strstr(nptr, "G")) || (p = strstr(nptr, "g"))) | ||
| factor = 0x40000000; | ||
| else if ((p = strstr(nptr, "M")) || (p = strstr(nptr, "m"))) | ||
| factor = 0x100000; | ||
| else if ((p = strstr(nptr, "K")) || (p = strstr(nptr, "k"))) | ||
| factor = 0x400; | ||
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| if (p) *p = '\0'; | ||
| size = factor * strtoul(nptr, NULL, 0); | ||
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| free(nptr); | ||
| return size; | ||
| } | ||
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| static void usage(void) | ||
| { | ||
| fprintf(stdout, "testsuite mmap [-a] [-s] [-f <filename>] -l <size>] -k\n"); | ||
| fprintf(stdout, "\n"); | ||
| fprintf(stdout, "-a: Anonymous mapping\n"); | ||
| fprintf(stdout, "-f: File based mapping\n"); | ||
| fprintf(stdout, "-s Shared anonymous mapping\n"); | ||
| fprintf(stdout, "-p: Private mapping\n"); | ||
| fprintf(stdout, "-l: Length of memory to be mapped\n"); | ||
| fprintf(stdout, "-k: Stop at various stages\n"); | ||
| fprintf(stdout, "\n"); | ||
| } | ||
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| static void mmap_init_data(struct mmap_struct *m) | ||
| { | ||
| m->page_size = getpagesize(); | ||
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| m->fd = -1; | ||
| m->flags = 0; | ||
| m->buf = (void *)-1; | ||
| m->len = MMAP_DEFAULT_SIZE; | ||
| m->key_break = 0; | ||
| } | ||
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| int main(int argc, char **argv) | ||
| { | ||
| struct mmap_struct m; | ||
| int opt, c, i; | ||
| void * thread_result; | ||
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| mmap_init_data(&m); | ||
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| while ((opt = getopt(argc, argv, "af:spl:kh")) != -1) { | ||
| switch (opt) { | ||
| case 'a': | ||
| m.flags |= MAP_ANONYMOUS; | ||
| break; | ||
| case 'f': | ||
| m.fd = open(optarg, O_RDWR); | ||
| if (m.fd < 0) { | ||
| fprintf(stderr, "Unable to open <%s>\n", optarg); | ||
| } | ||
| break; | ||
| case 's': | ||
| m.flags |= MAP_SHARED; | ||
| break; | ||
| case 'p': | ||
| m.flags |= MAP_PRIVATE; | ||
| break; | ||
| case 'l': | ||
| m.len = util_memory_parse_size(optarg); | ||
| break; | ||
| case 'k': | ||
| m.key_break = 1; | ||
| break; | ||
| case 'h': | ||
| default: | ||
| usage(); | ||
| } | ||
| } | ||
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| /* mmap */ | ||
| m.buf = mmap(NULL, m.len, PROT_READ | PROT_WRITE, m.flags, m.fd, 0); | ||
| if (m.buf == (void *)-1) { | ||
| fprintf(stdout, "Unable do mmap()\n"); | ||
| } | ||
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| /* Write */ | ||
| memset(m.buf, 0, m.len); | ||
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| /* The program will hold memory for 3600s */ | ||
| sleep(3600); | ||
|
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| return 0; | ||
| } | ||
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