1 files changed, 0 insertions, 390 deletions
diff --git a/tools/testing/selftests/vm/split_huge_page_test.c b/tools/testing/selftests/vm/split_huge_page_test.c
deleted file mode 100644
index 52497b7b9f1d..000000000000
--- a/tools/testing/selftests/vm/split_huge_page_test.c
+++ /dev/null
@@ -1,390 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * A test of splitting PMD THPs and PTE-mapped THPs from a specified virtual
- * address range in a process via <debugfs>/split_huge_pages interface.
- */
-
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <unistd.h>
-#include <inttypes.h>
-#include <string.h>
-#include <fcntl.h>
-#include <sys/mman.h>
-#include <sys/mount.h>
-#include <malloc.h>
-#include <stdbool.h>
-
-uint64_t pagesize;
-unsigned int pageshift;
-uint64_t pmd_pagesize;
-
-#define PMD_SIZE_PATH "/sys/kernel/mm/transparent_hugepage/hpage_pmd_size"
-#define SPLIT_DEBUGFS "/sys/kernel/debug/split_huge_pages"
-#define SMAP_PATH "/proc/self/smaps"
-#define INPUT_MAX 80
-
-#define PID_FMT "%d,0x%lx,0x%lx"
-#define PATH_FMT "%s,0x%lx,0x%lx"
-
-#define PFN_MASK     ((1UL<<55)-1)
-#define KPF_THP      (1UL<<22)
-
-int is_backed_by_thp(char *vaddr, int pagemap_file, int kpageflags_file)
-{
-	uint64_t paddr;
-	uint64_t page_flags;
-
-	if (pagemap_file) {
-		pread(pagemap_file, &paddr, sizeof(paddr),
-			((long)vaddr >> pageshift) * sizeof(paddr));
-
-		if (kpageflags_file) {
-			pread(kpageflags_file, &page_flags, sizeof(page_flags),
-				(paddr & PFN_MASK) * sizeof(page_flags));
-
-			return !!(page_flags & KPF_THP);
-		}
-	}
-	return 0;
-}
-
-
-static uint64_t read_pmd_pagesize(void)
-{
-	int fd;
-	char buf[20];
-	ssize_t num_read;
-
-	fd = open(PMD_SIZE_PATH, O_RDONLY);
-	if (fd == -1) {
-		perror("Open hpage_pmd_size failed");
-		exit(EXIT_FAILURE);
-	}
-	num_read = read(fd, buf, 19);
-	if (num_read < 1) {
-		close(fd);
-		perror("Read hpage_pmd_size failed");
-		exit(EXIT_FAILURE);
-	}
-	buf[num_read] = '\0';
-	close(fd);
-
-	return strtoul(buf, NULL, 10);
-}
-
-static int write_file(const char *path, const char *buf, size_t buflen)
-{
-	int fd;
-	ssize_t numwritten;
-
-	fd = open(path, O_WRONLY);
-	if (fd == -1)
-		return 0;
-
-	numwritten = write(fd, buf, buflen - 1);
-	close(fd);
-	if (numwritten < 1)
-		return 0;
-
-	return (unsigned int) numwritten;
-}
-
-static void write_debugfs(const char *fmt, ...)
-{
-	char input[INPUT_MAX];
-	int ret;
-	va_list argp;
-
-	va_start(argp, fmt);
-	ret = vsnprintf(input, INPUT_MAX, fmt, argp);
-	va_end(argp);
-
-	if (ret >= INPUT_MAX) {
-		printf("%s: Debugfs input is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-	if (!write_file(SPLIT_DEBUGFS, input, ret + 1)) {
-		perror(SPLIT_DEBUGFS);
-		exit(EXIT_FAILURE);
-	}
-}
-
-#define MAX_LINE_LENGTH 500
-
-static bool check_for_pattern(FILE *fp, const char *pattern, char *buf)
-{
-	while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) {
-		if (!strncmp(buf, pattern, strlen(pattern)))
-			return true;
-	}
-	return false;
-}
-
-static uint64_t check_huge(void *addr)
-{
-	uint64_t thp = 0;
-	int ret;
-	FILE *fp;
-	char buffer[MAX_LINE_LENGTH];
-	char addr_pattern[MAX_LINE_LENGTH];
-
-	ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "%08lx-",
-		       (unsigned long) addr);
-	if (ret >= MAX_LINE_LENGTH) {
-		printf("%s: Pattern is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-
-	fp = fopen(SMAP_PATH, "r");
-	if (!fp) {
-		printf("%s: Failed to open file %s\n", __func__, SMAP_PATH);
-		exit(EXIT_FAILURE);
-	}
-	if (!check_for_pattern(fp, addr_pattern, buffer))
-		goto err_out;
-
-	/*
-	 * Fetch the AnonHugePages: in the same block and check the number of
-	 * hugepages.
-	 */
-	if (!check_for_pattern(fp, "AnonHugePages:", buffer))
-		goto err_out;
-
-	if (sscanf(buffer, "AnonHugePages:%10ld kB", &thp) != 1) {
-		printf("Reading smap error\n");
-		exit(EXIT_FAILURE);
-	}
-
-err_out:
-	fclose(fp);
-	return thp;
-}
-
-void split_pmd_thp(void)
-{
-	char *one_page;
-	size_t len = 4 * pmd_pagesize;
-	uint64_t thp_size;
-	size_t i;
-
-	one_page = memalign(pmd_pagesize, len);
-
-	if (!one_page) {
-		printf("Fail to allocate memory\n");
-		exit(EXIT_FAILURE);
-	}
-
-	madvise(one_page, len, MADV_HUGEPAGE);
-
-	for (i = 0; i < len; i++)
-		one_page[i] = (char)i;
-
-	thp_size = check_huge(one_page);
-	if (!thp_size) {
-		printf("No THP is allocated\n");
-		exit(EXIT_FAILURE);
-	}
-
-	/* split all THPs */
-	write_debugfs(PID_FMT, getpid(), (uint64_t)one_page,
-		(uint64_t)one_page + len);
-
-	for (i = 0; i < len; i++)
-		if (one_page[i] != (char)i) {
-			printf("%ld byte corrupted\n", i);
-			exit(EXIT_FAILURE);
-		}
-
-
-	thp_size = check_huge(one_page);
-	if (thp_size) {
-		printf("Still %ld kB AnonHugePages not split\n", thp_size);
-		exit(EXIT_FAILURE);
-	}
-
-	printf("Split huge pages successful\n");
-	free(one_page);
-}
-
-void split_pte_mapped_thp(void)
-{
-	char *one_page, *pte_mapped, *pte_mapped2;
-	size_t len = 4 * pmd_pagesize;
-	uint64_t thp_size;
-	size_t i;
-	const char *pagemap_template = "/proc/%d/pagemap";
-	const char *kpageflags_proc = "/proc/kpageflags";
-	char pagemap_proc[255];
-	int pagemap_fd;
-	int kpageflags_fd;
-
-	if (snprintf(pagemap_proc, 255, pagemap_template, getpid()) < 0) {
-		perror("get pagemap proc error");
-		exit(EXIT_FAILURE);
-	}
-	pagemap_fd = open(pagemap_proc, O_RDONLY);
-
-	if (pagemap_fd == -1) {
-		perror("read pagemap:");
-		exit(EXIT_FAILURE);
-	}
-
-	kpageflags_fd = open(kpageflags_proc, O_RDONLY);
-
-	if (kpageflags_fd == -1) {
-		perror("read kpageflags:");
-		exit(EXIT_FAILURE);
-	}
-
-	one_page = mmap((void *)(1UL << 30), len, PROT_READ | PROT_WRITE,
-			MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
-
-	madvise(one_page, len, MADV_HUGEPAGE);
-
-	for (i = 0; i < len; i++)
-		one_page[i] = (char)i;
-
-	thp_size = check_huge(one_page);
-	if (!thp_size) {
-		printf("No THP is allocated\n");
-		exit(EXIT_FAILURE);
-	}
-
-	/* remap the first pagesize of first THP */
-	pte_mapped = mremap(one_page, pagesize, pagesize, MREMAP_MAYMOVE);
-
-	/* remap the Nth pagesize of Nth THP */
-	for (i = 1; i < 4; i++) {
-		pte_mapped2 = mremap(one_page + pmd_pagesize * i + pagesize * i,
-				     pagesize, pagesize,
-				     MREMAP_MAYMOVE|MREMAP_FIXED,
-				     pte_mapped + pagesize * i);
-		if (pte_mapped2 == (char *)-1) {
-			perror("mremap failed");
-			exit(EXIT_FAILURE);
-		}
-	}
-
-	/* smap does not show THPs after mremap, use kpageflags instead */
-	thp_size = 0;
-	for (i = 0; i < pagesize * 4; i++)
-		if (i % pagesize == 0 &&
-		    is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
-			thp_size++;
-
-	if (thp_size != 4) {
-		printf("Some THPs are missing during mremap\n");
-		exit(EXIT_FAILURE);
-	}
-
-	/* split all remapped THPs */
-	write_debugfs(PID_FMT, getpid(), (uint64_t)pte_mapped,
-		      (uint64_t)pte_mapped + pagesize * 4);
-
-	/* smap does not show THPs after mremap, use kpageflags instead */
-	thp_size = 0;
-	for (i = 0; i < pagesize * 4; i++) {
-		if (pte_mapped[i] != (char)i) {
-			printf("%ld byte corrupted\n", i);
-			exit(EXIT_FAILURE);
-		}
-		if (i % pagesize == 0 &&
-		    is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
-			thp_size++;
-	}
-
-	if (thp_size) {
-		printf("Still %ld THPs not split\n", thp_size);
-		exit(EXIT_FAILURE);
-	}
-
-	printf("Split PTE-mapped huge pages successful\n");
-	munmap(one_page, len);
-	close(pagemap_fd);
-	close(kpageflags_fd);
-}
-
-void split_file_backed_thp(void)
-{
-	int status;
-	int fd;
-	ssize_t num_written;
-	char tmpfs_template[] = "/tmp/thp_split_XXXXXX";
-	const char *tmpfs_loc = mkdtemp(tmpfs_template);
-	char testfile[INPUT_MAX];
-	uint64_t pgoff_start = 0, pgoff_end = 1024;
-
-	printf("Please enable pr_debug in split_huge_pages_in_file() if you need more info.\n");
-
-	status = mount("tmpfs", tmpfs_loc, "tmpfs", 0, "huge=always,size=4m");
-
-	if (status) {
-		printf("Unable to create a tmpfs for testing\n");
-		exit(EXIT_FAILURE);
-	}
-
-	status = snprintf(testfile, INPUT_MAX, "%s/thp_file", tmpfs_loc);
-	if (status >= INPUT_MAX) {
-		printf("Fail to create file-backed THP split testing file\n");
-		goto cleanup;
-	}
-
-	fd = open(testfile, O_CREAT|O_WRONLY);
-	if (fd == -1) {
-		perror("Cannot open testing file\n");
-		goto cleanup;
-	}
-
-	/* write something to the file, so a file-backed THP can be allocated */
-	num_written = write(fd, tmpfs_loc, strlen(tmpfs_loc) + 1);
-	close(fd);
-
-	if (num_written < 1) {
-		printf("Fail to write data to testing file\n");
-		goto cleanup;
-	}
-
-	/* split the file-backed THP */
-	write_debugfs(PATH_FMT, testfile, pgoff_start, pgoff_end);
-
-	status = unlink(testfile);
-	if (status)
-		perror("Cannot remove testing file\n");
-
-cleanup:
-	status = umount(tmpfs_loc);
-	if (status) {
-		printf("Unable to umount %s\n", tmpfs_loc);
-		exit(EXIT_FAILURE);
-	}
-	status = rmdir(tmpfs_loc);
-	if (status) {
-		perror("cannot remove tmp dir");
-		exit(EXIT_FAILURE);
-	}
-
-	printf("file-backed THP split test done, please check dmesg for more information\n");
-}
-
-int main(int argc, char **argv)
-{
-	if (geteuid() != 0) {
-		printf("Please run the benchmark as root\n");
-		exit(EXIT_FAILURE);
-	}
-
-	pagesize = getpagesize();
-	pageshift = ffs(pagesize) - 1;
-	pmd_pagesize = read_pmd_pagesize();
-
-	split_pmd_thp();
-	split_pte_mapped_thp();
-	split_file_backed_thp();
-
-	return 0;
-}