diff options
Diffstat (limited to 'tools/testing/selftests/vm/compaction_test.c')
| -rw-r--r-- | tools/testing/selftests/vm/compaction_test.c | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/tools/testing/selftests/vm/compaction_test.c b/tools/testing/selftests/vm/compaction_test.c deleted file mode 100644 index bcec71250873..000000000000 --- a/tools/testing/selftests/vm/compaction_test.c +++ /dev/null @@ -1,230 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * - * A test for the patch "Allow compaction of unevictable pages". - * With this patch we should be able to allocate at least 1/4 - * of RAM in huge pages. Without the patch much less is - * allocated. - */ - -#include <stdio.h> -#include <stdlib.h> -#include <sys/mman.h> -#include <sys/resource.h> -#include <fcntl.h> -#include <errno.h> -#include <unistd.h> -#include <string.h> - -#include "../kselftest.h" - -#define MAP_SIZE 1048576 - -struct map_list { - void *map; - struct map_list *next; -}; - -int read_memory_info(unsigned long *memfree, unsigned long *hugepagesize) -{ - char buffer[256] = {0}; - char *cmd = "cat /proc/meminfo | grep -i memfree | grep -o '[0-9]*'"; - FILE *cmdfile = popen(cmd, "r"); - - if (!(fgets(buffer, sizeof(buffer), cmdfile))) { - perror("Failed to read meminfo\n"); - return -1; - } - - pclose(cmdfile); - - *memfree = atoll(buffer); - cmd = "cat /proc/meminfo | grep -i hugepagesize | grep -o '[0-9]*'"; - cmdfile = popen(cmd, "r"); - - if (!(fgets(buffer, sizeof(buffer), cmdfile))) { - perror("Failed to read meminfo\n"); - return -1; - } - - pclose(cmdfile); - *hugepagesize = atoll(buffer); - - return 0; -} - -int prereq(void) -{ - char allowed; - int fd; - - fd = open("/proc/sys/vm/compact_unevictable_allowed", - O_RDONLY | O_NONBLOCK); - if (fd < 0) { - perror("Failed to open\n" - "/proc/sys/vm/compact_unevictable_allowed\n"); - return -1; - } - - if (read(fd, &allowed, sizeof(char)) != sizeof(char)) { - perror("Failed to read from\n" - "/proc/sys/vm/compact_unevictable_allowed\n"); - close(fd); - return -1; - } - - close(fd); - if (allowed == '1') - return 0; - - return -1; -} - -int check_compaction(unsigned long mem_free, unsigned int hugepage_size) -{ - int fd; - int compaction_index = 0; - char initial_nr_hugepages[10] = {0}; - char nr_hugepages[10] = {0}; - - /* We want to test with 80% of available memory. Else, OOM killer comes - in to play */ - mem_free = mem_free * 0.8; - - fd = open("/proc/sys/vm/nr_hugepages", O_RDWR | O_NONBLOCK); - if (fd < 0) { - perror("Failed to open /proc/sys/vm/nr_hugepages"); - return -1; - } - - if (read(fd, initial_nr_hugepages, sizeof(initial_nr_hugepages)) <= 0) { - perror("Failed to read from /proc/sys/vm/nr_hugepages"); - goto close_fd; - } - - /* Start with the initial condition of 0 huge pages*/ - if (write(fd, "0", sizeof(char)) != sizeof(char)) { - perror("Failed to write 0 to /proc/sys/vm/nr_hugepages\n"); - goto close_fd; - } - - lseek(fd, 0, SEEK_SET); - - /* Request a large number of huge pages. The Kernel will allocate - as much as it can */ - if (write(fd, "100000", (6*sizeof(char))) != (6*sizeof(char))) { - perror("Failed to write 100000 to /proc/sys/vm/nr_hugepages\n"); - goto close_fd; - } - - lseek(fd, 0, SEEK_SET); - - if (read(fd, nr_hugepages, sizeof(nr_hugepages)) <= 0) { - perror("Failed to re-read from /proc/sys/vm/nr_hugepages\n"); - goto close_fd; - } - - /* We should have been able to request at least 1/3 rd of the memory in - huge pages */ - compaction_index = mem_free/(atoi(nr_hugepages) * hugepage_size); - - if (compaction_index > 3) { - printf("No of huge pages allocated = %d\n", - (atoi(nr_hugepages))); - fprintf(stderr, "ERROR: Less that 1/%d of memory is available\n" - "as huge pages\n", compaction_index); - goto close_fd; - } - - printf("No of huge pages allocated = %d\n", - (atoi(nr_hugepages))); - - lseek(fd, 0, SEEK_SET); - - if (write(fd, initial_nr_hugepages, strlen(initial_nr_hugepages)) - != strlen(initial_nr_hugepages)) { - perror("Failed to write value to /proc/sys/vm/nr_hugepages\n"); - goto close_fd; - } - - close(fd); - return 0; - - close_fd: - close(fd); - printf("Not OK. Compaction test failed."); - return -1; -} - - -int main(int argc, char **argv) -{ - struct rlimit lim; - struct map_list *list, *entry; - size_t page_size, i; - void *map = NULL; - unsigned long mem_free = 0; - unsigned long hugepage_size = 0; - unsigned long mem_fragmentable = 0; - - if (prereq() != 0) { - printf("Either the sysctl compact_unevictable_allowed is not\n" - "set to 1 or couldn't read the proc file.\n" - "Skipping the test\n"); - return KSFT_SKIP; - } - - lim.rlim_cur = RLIM_INFINITY; - lim.rlim_max = RLIM_INFINITY; - if (setrlimit(RLIMIT_MEMLOCK, &lim)) { - perror("Failed to set rlimit:\n"); - return -1; - } - - page_size = getpagesize(); - - list = NULL; - - if (read_memory_info(&mem_free, &hugepage_size) != 0) { - printf("ERROR: Cannot read meminfo\n"); - return -1; - } - - mem_fragmentable = mem_free * 0.8 / 1024; - - while (mem_fragmentable > 0) { - map = mmap(NULL, MAP_SIZE, PROT_READ | PROT_WRITE, - MAP_ANONYMOUS | MAP_PRIVATE | MAP_LOCKED, -1, 0); - if (map == MAP_FAILED) - break; - - entry = malloc(sizeof(struct map_list)); - if (!entry) { - munmap(map, MAP_SIZE); - break; - } - entry->map = map; - entry->next = list; - list = entry; - - /* Write something (in this case the address of the map) to - * ensure that KSM can't merge the mapped pages - */ - for (i = 0; i < MAP_SIZE; i += page_size) - *(unsigned long *)(map + i) = (unsigned long)map + i; - - mem_fragmentable--; - } - - for (entry = list; entry != NULL; entry = entry->next) { - munmap(entry->map, MAP_SIZE); - if (!entry->next) - break; - entry = entry->next; - } - - if (check_compaction(mem_free, hugepage_size) == 0) - return 0; - - return -1; -} |