1 files changed, 446 insertions, 0 deletions
diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c
new file mode 100644
index 000000000000..856662d2f87a
--- /dev/null
+++ b/tools/testing/selftests/mm/split_huge_page_test.c
@@ -0,0 +1,446 @@
+// 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>
+#include <time.h>
+#include "vm_util.h"
+#include "../kselftest.h"
+
+uint64_t pagesize;
+unsigned int pageshift;
+uint64_t pmd_pagesize;
+
+#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,%d"
+#define PATH_FMT "%s,0x%lx,0x%lx,%d"
+
+#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 void write_file(const char *path, const char *buf, size_t buflen)
+{
+	int fd;
+	ssize_t numwritten;
+
+	fd = open(path, O_WRONLY);
+	if (fd == -1)
+		ksft_exit_fail_msg("%s open failed: %s\n", path, strerror(errno));
+
+	numwritten = write(fd, buf, buflen - 1);
+	close(fd);
+	if (numwritten < 1)
+		ksft_exit_fail_msg("Write failed\n");
+}
+
+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)
+		ksft_exit_fail_msg("%s: Debugfs input is too long\n", __func__);
+
+	write_file(SPLIT_DEBUGFS, input, ret + 1);
+}
+
+void split_pmd_thp(void)
+{
+	char *one_page;
+	size_t len = 4 * pmd_pagesize;
+	size_t i;
+
+	one_page = memalign(pmd_pagesize, len);
+	if (!one_page)
+		ksft_exit_fail_msg("Fail to allocate memory: %s\n", strerror(errno));
+
+	madvise(one_page, len, MADV_HUGEPAGE);
+
+	for (i = 0; i < len; i++)
+		one_page[i] = (char)i;
+
+	if (!check_huge_anon(one_page, 4, pmd_pagesize))
+		ksft_exit_fail_msg("No THP is allocated\n");
+
+	/* split all THPs */
+	write_debugfs(PID_FMT, getpid(), (uint64_t)one_page,
+		(uint64_t)one_page + len, 0);
+
+	for (i = 0; i < len; i++)
+		if (one_page[i] != (char)i)
+			ksft_exit_fail_msg("%ld byte corrupted\n", i);
+
+
+	if (!check_huge_anon(one_page, 0, pmd_pagesize))
+		ksft_exit_fail_msg("Still AnonHugePages not split\n");
+
+	ksft_test_result_pass("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)
+		ksft_exit_fail_msg("get pagemap proc error: %s\n", strerror(errno));
+
+	pagemap_fd = open(pagemap_proc, O_RDONLY);
+	if (pagemap_fd == -1)
+		ksft_exit_fail_msg("read pagemap: %s\n", strerror(errno));
+
+	kpageflags_fd = open(kpageflags_proc, O_RDONLY);
+	if (kpageflags_fd == -1)
+		ksft_exit_fail_msg("read kpageflags: %s\n", strerror(errno));
+
+	one_page = mmap((void *)(1UL << 30), len, PROT_READ | PROT_WRITE,
+			MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+	if (one_page == MAP_FAILED)
+		ksft_exit_fail_msg("Fail to allocate memory: %s\n", strerror(errno));
+
+	madvise(one_page, len, MADV_HUGEPAGE);
+
+	for (i = 0; i < len; i++)
+		one_page[i] = (char)i;
+
+	if (!check_huge_anon(one_page, 4, pmd_pagesize))
+		ksft_exit_fail_msg("No THP is allocated\n");
+
+	/* 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 == MAP_FAILED)
+			ksft_exit_fail_msg("mremap failed: %s\n", strerror(errno));
+	}
+
+	/* 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)
+		ksft_exit_fail_msg("Some THPs are missing during mremap\n");
+
+	/* split all remapped THPs */
+	write_debugfs(PID_FMT, getpid(), (uint64_t)pte_mapped,
+		      (uint64_t)pte_mapped + pagesize * 4, 0);
+
+	/* 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)
+			ksft_exit_fail_msg("%ld byte corrupted\n", i);
+
+		if (i % pagesize == 0 &&
+		    is_backed_by_thp(&pte_mapped[i], pagemap_fd, kpageflags_fd))
+			thp_size++;
+	}
+
+	if (thp_size)
+		ksft_exit_fail_msg("Still %ld THPs not split\n", thp_size);
+
+	ksft_test_result_pass("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;
+
+	ksft_print_msg("Please enable pr_debug in split_huge_pages_in_file() for more info.\n");
+
+	status = mount("tmpfs", tmpfs_loc, "tmpfs", 0, "huge=always,size=4m");
+
+	if (status)
+		ksft_exit_fail_msg("Unable to create a tmpfs for testing\n");
+
+	status = snprintf(testfile, INPUT_MAX, "%s/thp_file", tmpfs_loc);
+	if (status >= INPUT_MAX) {
+		ksft_exit_fail_msg("Fail to create file-backed THP split testing file\n");
+	}
+
+	fd = open(testfile, O_CREAT|O_WRONLY);
+	if (fd == -1) {
+		ksft_perror("Cannot open testing file");
+		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) {
+		ksft_perror("Fail to write data to testing file");
+		goto cleanup;
+	}
+
+	/* split the file-backed THP */
+	write_debugfs(PATH_FMT, testfile, pgoff_start, pgoff_end, 0);
+
+	status = unlink(testfile);
+	if (status) {
+		ksft_perror("Cannot remove testing file");
+		goto cleanup;
+	}
+
+	status = umount(tmpfs_loc);
+	if (status) {
+		rmdir(tmpfs_loc);
+		ksft_exit_fail_msg("Unable to umount %s\n", tmpfs_loc);
+	}
+
+	status = rmdir(tmpfs_loc);
+	if (status)
+		ksft_exit_fail_msg("cannot remove tmp dir: %s\n", strerror(errno));
+
+	ksft_print_msg("Please check dmesg for more information\n");
+	ksft_test_result_pass("File-backed THP split test done\n");
+	return;
+
+cleanup:
+	umount(tmpfs_loc);
+	rmdir(tmpfs_loc);
+	ksft_exit_fail_msg("Error occurred\n");
+}
+
+bool prepare_thp_fs(const char *xfs_path, char *thp_fs_template,
+		const char **thp_fs_loc)
+{
+	if (xfs_path) {
+		*thp_fs_loc = xfs_path;
+		return false;
+	}
+
+	*thp_fs_loc = mkdtemp(thp_fs_template);
+
+	if (!*thp_fs_loc)
+		ksft_exit_fail_msg("cannot create temp folder\n");
+
+	return true;
+}
+
+void cleanup_thp_fs(const char *thp_fs_loc, bool created_tmp)
+{
+	int status;
+
+	if (!created_tmp)
+		return;
+
+	status = rmdir(thp_fs_loc);
+	if (status)
+		ksft_exit_fail_msg("cannot remove tmp dir: %s\n",
+				   strerror(errno));
+}
+
+int create_pagecache_thp_and_fd(const char *testfile, size_t fd_size, int *fd,
+		char **addr)
+{
+	size_t i;
+	int dummy;
+
+	srand(time(NULL));
+
+	*fd = open(testfile, O_CREAT | O_RDWR, 0664);
+	if (*fd == -1)
+		ksft_exit_fail_msg("Failed to create a file at %s\n", testfile);
+
+	for (i = 0; i < fd_size; i++) {
+		unsigned char byte = (unsigned char)i;
+
+		write(*fd, &byte, sizeof(byte));
+	}
+	close(*fd);
+	sync();
+	*fd = open("/proc/sys/vm/drop_caches", O_WRONLY);
+	if (*fd == -1) {
+		ksft_perror("open drop_caches");
+		goto err_out_unlink;
+	}
+	if (write(*fd, "3", 1) != 1) {
+		ksft_perror("write to drop_caches");
+		goto err_out_unlink;
+	}
+	close(*fd);
+
+	*fd = open(testfile, O_RDWR);
+	if (*fd == -1) {
+		ksft_perror("Failed to open testfile\n");
+		goto err_out_unlink;
+	}
+
+	*addr = mmap(NULL, fd_size, PROT_READ|PROT_WRITE, MAP_SHARED, *fd, 0);
+	if (*addr == (char *)-1) {
+		ksft_perror("cannot mmap");
+		goto err_out_close;
+	}
+	madvise(*addr, fd_size, MADV_HUGEPAGE);
+
+	for (size_t i = 0; i < fd_size; i++)
+		dummy += *(*addr + i);
+
+	if (!check_huge_file(*addr, fd_size / pmd_pagesize, pmd_pagesize)) {
+		ksft_print_msg("No large pagecache folio generated, please provide a filesystem supporting large folio\n");
+		munmap(*addr, fd_size);
+		close(*fd);
+		unlink(testfile);
+		ksft_test_result_skip("Pagecache folio split skipped\n");
+		return -2;
+	}
+	return 0;
+err_out_close:
+	close(*fd);
+err_out_unlink:
+	unlink(testfile);
+	ksft_exit_fail_msg("Failed to create large pagecache folios\n");
+	return -1;
+}
+
+void split_thp_in_pagecache_to_order(size_t fd_size, int order, const char *fs_loc)
+{
+	int fd;
+	char *addr;
+	size_t i;
+	char testfile[INPUT_MAX];
+	int err = 0;
+
+	err = snprintf(testfile, INPUT_MAX, "%s/test", fs_loc);
+
+	if (err < 0)
+		ksft_exit_fail_msg("cannot generate right test file name\n");
+
+	err = create_pagecache_thp_and_fd(testfile, fd_size, &fd, &addr);
+	if (err)
+		return;
+	err = 0;
+
+	write_debugfs(PID_FMT, getpid(), (uint64_t)addr, (uint64_t)addr + fd_size, order);
+
+	for (i = 0; i < fd_size; i++)
+		if (*(addr + i) != (char)i) {
+			ksft_print_msg("%lu byte corrupted in the file\n", i);
+			err = EXIT_FAILURE;
+			goto out;
+		}
+
+	if (!check_huge_file(addr, 0, pmd_pagesize)) {
+		ksft_print_msg("Still FilePmdMapped not split\n");
+		err = EXIT_FAILURE;
+		goto out;
+	}
+
+out:
+	munmap(addr, fd_size);
+	close(fd);
+	unlink(testfile);
+	if (err)
+		ksft_exit_fail_msg("Split PMD-mapped pagecache folio to order %d failed\n", order);
+	ksft_test_result_pass("Split PMD-mapped pagecache folio to order %d passed\n", order);
+}
+
+int main(int argc, char **argv)
+{
+	int i;
+	size_t fd_size;
+	char *optional_xfs_path = NULL;
+	char fs_loc_template[] = "/tmp/thp_fs_XXXXXX";
+	const char *fs_loc;
+	bool created_tmp;
+
+	ksft_print_header();
+
+	if (geteuid() != 0) {
+		ksft_print_msg("Please run the benchmark as root\n");
+		ksft_finished();
+	}
+
+	if (argc > 1)
+		optional_xfs_path = argv[1];
+
+	ksft_set_plan(3+9);
+
+	pagesize = getpagesize();
+	pageshift = ffs(pagesize) - 1;
+	pmd_pagesize = read_pmd_pagesize();
+	if (!pmd_pagesize)
+		ksft_exit_fail_msg("Reading PMD pagesize failed\n");
+
+	fd_size = 2 * pmd_pagesize;
+
+	split_pmd_thp();
+	split_pte_mapped_thp();
+	split_file_backed_thp();
+
+	created_tmp = prepare_thp_fs(optional_xfs_path, fs_loc_template,
+			&fs_loc);
+	for (i = 8; i >= 0; i--)
+		split_thp_in_pagecache_to_order(fd_size, i, fs_loc);
+	cleanup_thp_fs(fs_loc, created_tmp);
+
+	ksft_finished();
+
+	return 0;
+}