1 files changed, 0 insertions, 1035 deletions
diff --git a/tools/testing/selftests/vm/khugepaged.c b/tools/testing/selftests/vm/khugepaged.c
deleted file mode 100644
index 8b75821302a7..000000000000
--- a/tools/testing/selftests/vm/khugepaged.c
+++ /dev/null
@@ -1,1035 +0,0 @@
-#define _GNU_SOURCE
-#include <fcntl.h>
-#include <limits.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdbool.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <sys/mman.h>
-#include <sys/wait.h>
-
-#ifndef MADV_PAGEOUT
-#define MADV_PAGEOUT 21
-#endif
-
-#define BASE_ADDR ((void *)(1UL << 30))
-static unsigned long hpage_pmd_size;
-static unsigned long page_size;
-static int hpage_pmd_nr;
-
-#define THP_SYSFS "/sys/kernel/mm/transparent_hugepage/"
-#define PID_SMAPS "/proc/self/smaps"
-
-enum thp_enabled {
-	THP_ALWAYS,
-	THP_MADVISE,
-	THP_NEVER,
-};
-
-static const char *thp_enabled_strings[] = {
-	"always",
-	"madvise",
-	"never",
-	NULL
-};
-
-enum thp_defrag {
-	THP_DEFRAG_ALWAYS,
-	THP_DEFRAG_DEFER,
-	THP_DEFRAG_DEFER_MADVISE,
-	THP_DEFRAG_MADVISE,
-	THP_DEFRAG_NEVER,
-};
-
-static const char *thp_defrag_strings[] = {
-	"always",
-	"defer",
-	"defer+madvise",
-	"madvise",
-	"never",
-	NULL
-};
-
-enum shmem_enabled {
-	SHMEM_ALWAYS,
-	SHMEM_WITHIN_SIZE,
-	SHMEM_ADVISE,
-	SHMEM_NEVER,
-	SHMEM_DENY,
-	SHMEM_FORCE,
-};
-
-static const char *shmem_enabled_strings[] = {
-	"always",
-	"within_size",
-	"advise",
-	"never",
-	"deny",
-	"force",
-	NULL
-};
-
-struct khugepaged_settings {
-	bool defrag;
-	unsigned int alloc_sleep_millisecs;
-	unsigned int scan_sleep_millisecs;
-	unsigned int max_ptes_none;
-	unsigned int max_ptes_swap;
-	unsigned int max_ptes_shared;
-	unsigned long pages_to_scan;
-};
-
-struct settings {
-	enum thp_enabled thp_enabled;
-	enum thp_defrag thp_defrag;
-	enum shmem_enabled shmem_enabled;
-	bool debug_cow;
-	bool use_zero_page;
-	struct khugepaged_settings khugepaged;
-};
-
-static struct settings default_settings = {
-	.thp_enabled = THP_MADVISE,
-	.thp_defrag = THP_DEFRAG_ALWAYS,
-	.shmem_enabled = SHMEM_NEVER,
-	.debug_cow = 0,
-	.use_zero_page = 0,
-	.khugepaged = {
-		.defrag = 1,
-		.alloc_sleep_millisecs = 10,
-		.scan_sleep_millisecs = 10,
-	},
-};
-
-static struct settings saved_settings;
-static bool skip_settings_restore;
-
-static int exit_status;
-
-static void success(const char *msg)
-{
-	printf(" \e[32m%s\e[0m\n", msg);
-}
-
-static void fail(const char *msg)
-{
-	printf(" \e[31m%s\e[0m\n", msg);
-	exit_status++;
-}
-
-static int read_file(const char *path, char *buf, size_t buflen)
-{
-	int fd;
-	ssize_t numread;
-
-	fd = open(path, O_RDONLY);
-	if (fd == -1)
-		return 0;
-
-	numread = read(fd, buf, buflen - 1);
-	if (numread < 1) {
-		close(fd);
-		return 0;
-	}
-
-	buf[numread] = '\0';
-	close(fd);
-
-	return (unsigned int) numread;
-}
-
-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 int read_string(const char *name, const char *strings[])
-{
-	char path[PATH_MAX];
-	char buf[256];
-	char *c;
-	int ret;
-
-	ret = snprintf(path, PATH_MAX, THP_SYSFS "%s", name);
-	if (ret >= PATH_MAX) {
-		printf("%s: Pathname is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-	if (!read_file(path, buf, sizeof(buf))) {
-		perror(path);
-		exit(EXIT_FAILURE);
-	}
-
-	c = strchr(buf, '[');
-	if (!c) {
-		printf("%s: Parse failure\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-	c++;
-	memmove(buf, c, sizeof(buf) - (c - buf));
-
-	c = strchr(buf, ']');
-	if (!c) {
-		printf("%s: Parse failure\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-	*c = '\0';
-
-	ret = 0;
-	while (strings[ret]) {
-		if (!strcmp(strings[ret], buf))
-			return ret;
-		ret++;
-	}
-
-	printf("Failed to parse %s\n", name);
-	exit(EXIT_FAILURE);
-}
-
-static void write_string(const char *name, const char *val)
-{
-	char path[PATH_MAX];
-	int ret;
-
-	ret = snprintf(path, PATH_MAX, THP_SYSFS "%s", name);
-	if (ret >= PATH_MAX) {
-		printf("%s: Pathname is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-	if (!write_file(path, val, strlen(val) + 1)) {
-		perror(path);
-		exit(EXIT_FAILURE);
-	}
-}
-
-static const unsigned long read_num(const char *name)
-{
-	char path[PATH_MAX];
-	char buf[21];
-	int ret;
-
-	ret = snprintf(path, PATH_MAX, THP_SYSFS "%s", name);
-	if (ret >= PATH_MAX) {
-		printf("%s: Pathname is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-	ret = read_file(path, buf, sizeof(buf));
-	if (ret < 0) {
-		perror("read_file(read_num)");
-		exit(EXIT_FAILURE);
-	}
-
-	return strtoul(buf, NULL, 10);
-}
-
-static void write_num(const char *name, unsigned long num)
-{
-	char path[PATH_MAX];
-	char buf[21];
-	int ret;
-
-	ret = snprintf(path, PATH_MAX, THP_SYSFS "%s", name);
-	if (ret >= PATH_MAX) {
-		printf("%s: Pathname is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-
-	sprintf(buf, "%ld", num);
-	if (!write_file(path, buf, strlen(buf) + 1)) {
-		perror(path);
-		exit(EXIT_FAILURE);
-	}
-}
-
-static void write_settings(struct settings *settings)
-{
-	struct khugepaged_settings *khugepaged = &settings->khugepaged;
-
-	write_string("enabled", thp_enabled_strings[settings->thp_enabled]);
-	write_string("defrag", thp_defrag_strings[settings->thp_defrag]);
-	write_string("shmem_enabled",
-			shmem_enabled_strings[settings->shmem_enabled]);
-	write_num("debug_cow", settings->debug_cow);
-	write_num("use_zero_page", settings->use_zero_page);
-
-	write_num("khugepaged/defrag", khugepaged->defrag);
-	write_num("khugepaged/alloc_sleep_millisecs",
-			khugepaged->alloc_sleep_millisecs);
-	write_num("khugepaged/scan_sleep_millisecs",
-			khugepaged->scan_sleep_millisecs);
-	write_num("khugepaged/max_ptes_none", khugepaged->max_ptes_none);
-	write_num("khugepaged/max_ptes_swap", khugepaged->max_ptes_swap);
-	write_num("khugepaged/max_ptes_shared", khugepaged->max_ptes_shared);
-	write_num("khugepaged/pages_to_scan", khugepaged->pages_to_scan);
-}
-
-static void restore_settings(int sig)
-{
-	if (skip_settings_restore)
-		goto out;
-
-	printf("Restore THP and khugepaged settings...");
-	write_settings(&saved_settings);
-	success("OK");
-	if (sig)
-		exit(EXIT_FAILURE);
-out:
-	exit(exit_status);
-}
-
-static void save_settings(void)
-{
-	printf("Save THP and khugepaged settings...");
-	saved_settings = (struct settings) {
-		.thp_enabled = read_string("enabled", thp_enabled_strings),
-		.thp_defrag = read_string("defrag", thp_defrag_strings),
-		.shmem_enabled =
-			read_string("shmem_enabled", shmem_enabled_strings),
-		.debug_cow = read_num("debug_cow"),
-		.use_zero_page = read_num("use_zero_page"),
-	};
-	saved_settings.khugepaged = (struct khugepaged_settings) {
-		.defrag = read_num("khugepaged/defrag"),
-		.alloc_sleep_millisecs =
-			read_num("khugepaged/alloc_sleep_millisecs"),
-		.scan_sleep_millisecs =
-			read_num("khugepaged/scan_sleep_millisecs"),
-		.max_ptes_none = read_num("khugepaged/max_ptes_none"),
-		.max_ptes_swap = read_num("khugepaged/max_ptes_swap"),
-		.max_ptes_shared = read_num("khugepaged/max_ptes_shared"),
-		.pages_to_scan = read_num("khugepaged/pages_to_scan"),
-	};
-	success("OK");
-
-	signal(SIGTERM, restore_settings);
-	signal(SIGINT, restore_settings);
-	signal(SIGHUP, restore_settings);
-	signal(SIGQUIT, restore_settings);
-}
-
-static void adjust_settings(void)
-{
-
-	printf("Adjust settings...");
-	write_settings(&default_settings);
-	success("OK");
-}
-
-#define MAX_LINE_LENGTH 500
-
-static bool check_for_pattern(FILE *fp, char *pattern, char *buf)
-{
-	while (fgets(buf, MAX_LINE_LENGTH, fp) != NULL) {
-		if (!strncmp(buf, pattern, strlen(pattern)))
-			return true;
-	}
-	return false;
-}
-
-static bool check_huge(void *addr)
-{
-	bool thp = false;
-	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(PID_SMAPS, "r");
-	if (!fp) {
-		printf("%s: Failed to open file %s\n", __func__, PID_SMAPS);
-		exit(EXIT_FAILURE);
-	}
-	if (!check_for_pattern(fp, addr_pattern, buffer))
-		goto err_out;
-
-	ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "AnonHugePages:%10ld kB",
-		       hpage_pmd_size >> 10);
-	if (ret >= MAX_LINE_LENGTH) {
-		printf("%s: Pattern is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-	/*
-	 * Fetch the AnonHugePages: in the same block and check whether it got
-	 * the expected number of hugeepages next.
-	 */
-	if (!check_for_pattern(fp, "AnonHugePages:", buffer))
-		goto err_out;
-
-	if (strncmp(buffer, addr_pattern, strlen(addr_pattern)))
-		goto err_out;
-
-	thp = true;
-err_out:
-	fclose(fp);
-	return thp;
-}
-
-
-static bool check_swap(void *addr, unsigned long size)
-{
-	bool swap = false;
-	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(PID_SMAPS, "r");
-	if (!fp) {
-		printf("%s: Failed to open file %s\n", __func__, PID_SMAPS);
-		exit(EXIT_FAILURE);
-	}
-	if (!check_for_pattern(fp, addr_pattern, buffer))
-		goto err_out;
-
-	ret = snprintf(addr_pattern, MAX_LINE_LENGTH, "Swap:%19ld kB",
-		       size >> 10);
-	if (ret >= MAX_LINE_LENGTH) {
-		printf("%s: Pattern is too long\n", __func__);
-		exit(EXIT_FAILURE);
-	}
-	/*
-	 * Fetch the Swap: in the same block and check whether it got
-	 * the expected number of hugeepages next.
-	 */
-	if (!check_for_pattern(fp, "Swap:", buffer))
-		goto err_out;
-
-	if (strncmp(buffer, addr_pattern, strlen(addr_pattern)))
-		goto err_out;
-
-	swap = true;
-err_out:
-	fclose(fp);
-	return swap;
-}
-
-static void *alloc_mapping(void)
-{
-	void *p;
-
-	p = mmap(BASE_ADDR, hpage_pmd_size, PROT_READ | PROT_WRITE,
-			MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
-	if (p != BASE_ADDR) {
-		printf("Failed to allocate VMA at %p\n", BASE_ADDR);
-		exit(EXIT_FAILURE);
-	}
-
-	return p;
-}
-
-static void fill_memory(int *p, unsigned long start, unsigned long end)
-{
-	int i;
-
-	for (i = start / page_size; i < end / page_size; i++)
-		p[i * page_size / sizeof(*p)] = i + 0xdead0000;
-}
-
-static void validate_memory(int *p, unsigned long start, unsigned long end)
-{
-	int i;
-
-	for (i = start / page_size; i < end / page_size; i++) {
-		if (p[i * page_size / sizeof(*p)] != i + 0xdead0000) {
-			printf("Page %d is corrupted: %#x\n",
-					i, p[i * page_size / sizeof(*p)]);
-			exit(EXIT_FAILURE);
-		}
-	}
-}
-
-#define TICK 500000
-static bool wait_for_scan(const char *msg, char *p)
-{
-	int full_scans;
-	int timeout = 6; /* 3 seconds */
-
-	/* Sanity check */
-	if (check_huge(p)) {
-		printf("Unexpected huge page\n");
-		exit(EXIT_FAILURE);
-	}
-
-	madvise(p, hpage_pmd_size, MADV_HUGEPAGE);
-
-	/* Wait until the second full_scan completed */
-	full_scans = read_num("khugepaged/full_scans") + 2;
-
-	printf("%s...", msg);
-	while (timeout--) {
-		if (check_huge(p))
-			break;
-		if (read_num("khugepaged/full_scans") >= full_scans)
-			break;
-		printf(".");
-		usleep(TICK);
-	}
-
-	madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE);
-
-	return timeout == -1;
-}
-
-static void alloc_at_fault(void)
-{
-	struct settings settings = default_settings;
-	char *p;
-
-	settings.thp_enabled = THP_ALWAYS;
-	write_settings(&settings);
-
-	p = alloc_mapping();
-	*p = 1;
-	printf("Allocate huge page on fault...");
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	write_settings(&default_settings);
-
-	madvise(p, page_size, MADV_DONTNEED);
-	printf("Split huge PMD on MADV_DONTNEED...");
-	if (!check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_full(void)
-{
-	void *p;
-
-	p = alloc_mapping();
-	fill_memory(p, 0, hpage_pmd_size);
-	if (wait_for_scan("Collapse fully populated PTE table", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, hpage_pmd_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_empty(void)
-{
-	void *p;
-
-	p = alloc_mapping();
-	if (wait_for_scan("Do not collapse empty PTE table", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		fail("Fail");
-	else
-		success("OK");
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_single_pte_entry(void)
-{
-	void *p;
-
-	p = alloc_mapping();
-	fill_memory(p, 0, page_size);
-	if (wait_for_scan("Collapse PTE table with single PTE entry present", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, page_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_max_ptes_none(void)
-{
-	int max_ptes_none = hpage_pmd_nr / 2;
-	struct settings settings = default_settings;
-	void *p;
-
-	settings.khugepaged.max_ptes_none = max_ptes_none;
-	write_settings(&settings);
-
-	p = alloc_mapping();
-
-	fill_memory(p, 0, (hpage_pmd_nr - max_ptes_none - 1) * page_size);
-	if (wait_for_scan("Do not collapse with max_ptes_none exceeded", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		fail("Fail");
-	else
-		success("OK");
-	validate_memory(p, 0, (hpage_pmd_nr - max_ptes_none - 1) * page_size);
-
-	fill_memory(p, 0, (hpage_pmd_nr - max_ptes_none) * page_size);
-	if (wait_for_scan("Collapse with max_ptes_none PTEs empty", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, (hpage_pmd_nr - max_ptes_none) * page_size);
-
-	munmap(p, hpage_pmd_size);
-	write_settings(&default_settings);
-}
-
-static void collapse_swapin_single_pte(void)
-{
-	void *p;
-	p = alloc_mapping();
-	fill_memory(p, 0, hpage_pmd_size);
-
-	printf("Swapout one page...");
-	if (madvise(p, page_size, MADV_PAGEOUT)) {
-		perror("madvise(MADV_PAGEOUT)");
-		exit(EXIT_FAILURE);
-	}
-	if (check_swap(p, page_size)) {
-		success("OK");
-	} else {
-		fail("Fail");
-		goto out;
-	}
-
-	if (wait_for_scan("Collapse with swapping in single PTE entry", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, hpage_pmd_size);
-out:
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_max_ptes_swap(void)
-{
-	int max_ptes_swap = read_num("khugepaged/max_ptes_swap");
-	void *p;
-
-	p = alloc_mapping();
-
-	fill_memory(p, 0, hpage_pmd_size);
-	printf("Swapout %d of %d pages...", max_ptes_swap + 1, hpage_pmd_nr);
-	if (madvise(p, (max_ptes_swap + 1) * page_size, MADV_PAGEOUT)) {
-		perror("madvise(MADV_PAGEOUT)");
-		exit(EXIT_FAILURE);
-	}
-	if (check_swap(p, (max_ptes_swap + 1) * page_size)) {
-		success("OK");
-	} else {
-		fail("Fail");
-		goto out;
-	}
-
-	if (wait_for_scan("Do not collapse with max_ptes_swap exceeded", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		fail("Fail");
-	else
-		success("OK");
-	validate_memory(p, 0, hpage_pmd_size);
-
-	fill_memory(p, 0, hpage_pmd_size);
-	printf("Swapout %d of %d pages...", max_ptes_swap, hpage_pmd_nr);
-	if (madvise(p, max_ptes_swap * page_size, MADV_PAGEOUT)) {
-		perror("madvise(MADV_PAGEOUT)");
-		exit(EXIT_FAILURE);
-	}
-	if (check_swap(p, max_ptes_swap * page_size)) {
-		success("OK");
-	} else {
-		fail("Fail");
-		goto out;
-	}
-
-	if (wait_for_scan("Collapse with max_ptes_swap pages swapped out", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, hpage_pmd_size);
-out:
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_single_pte_entry_compound(void)
-{
-	void *p;
-
-	p = alloc_mapping();
-
-	printf("Allocate huge page...");
-	madvise(p, hpage_pmd_size, MADV_HUGEPAGE);
-	fill_memory(p, 0, hpage_pmd_size);
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE);
-
-	printf("Split huge page leaving single PTE mapping compound page...");
-	madvise(p + page_size, hpage_pmd_size - page_size, MADV_DONTNEED);
-	if (!check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	if (wait_for_scan("Collapse PTE table with single PTE mapping compound page", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, page_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_full_of_compound(void)
-{
-	void *p;
-
-	p = alloc_mapping();
-
-	printf("Allocate huge page...");
-	madvise(p, hpage_pmd_size, MADV_HUGEPAGE);
-	fill_memory(p, 0, hpage_pmd_size);
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	printf("Split huge page leaving single PTE page table full of compound pages...");
-	madvise(p, page_size, MADV_NOHUGEPAGE);
-	madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE);
-	if (!check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	if (wait_for_scan("Collapse PTE table full of compound pages", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, hpage_pmd_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_compound_extreme(void)
-{
-	void *p;
-	int i;
-
-	p = alloc_mapping();
-	for (i = 0; i < hpage_pmd_nr; i++) {
-		printf("\rConstruct PTE page table full of different PTE-mapped compound pages %3d/%d...",
-				i + 1, hpage_pmd_nr);
-
-		madvise(BASE_ADDR, hpage_pmd_size, MADV_HUGEPAGE);
-		fill_memory(BASE_ADDR, 0, hpage_pmd_size);
-		if (!check_huge(BASE_ADDR)) {
-			printf("Failed to allocate huge page\n");
-			exit(EXIT_FAILURE);
-		}
-		madvise(BASE_ADDR, hpage_pmd_size, MADV_NOHUGEPAGE);
-
-		p = mremap(BASE_ADDR - i * page_size,
-				i * page_size + hpage_pmd_size,
-				(i + 1) * page_size,
-				MREMAP_MAYMOVE | MREMAP_FIXED,
-				BASE_ADDR + 2 * hpage_pmd_size);
-		if (p == MAP_FAILED) {
-			perror("mremap+unmap");
-			exit(EXIT_FAILURE);
-		}
-
-		p = mremap(BASE_ADDR + 2 * hpage_pmd_size,
-				(i + 1) * page_size,
-				(i + 1) * page_size + hpage_pmd_size,
-				MREMAP_MAYMOVE | MREMAP_FIXED,
-				BASE_ADDR - (i + 1) * page_size);
-		if (p == MAP_FAILED) {
-			perror("mremap+alloc");
-			exit(EXIT_FAILURE);
-		}
-	}
-
-	munmap(BASE_ADDR, hpage_pmd_size);
-	fill_memory(p, 0, hpage_pmd_size);
-	if (!check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	if (wait_for_scan("Collapse PTE table full of different compound pages", p))
-		fail("Timeout");
-	else if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	validate_memory(p, 0, hpage_pmd_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_fork(void)
-{
-	int wstatus;
-	void *p;
-
-	p = alloc_mapping();
-
-	printf("Allocate small page...");
-	fill_memory(p, 0, page_size);
-	if (!check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	printf("Share small page over fork()...");
-	if (!fork()) {
-		/* Do not touch settings on child exit */
-		skip_settings_restore = true;
-		exit_status = 0;
-
-		if (!check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		fill_memory(p, page_size, 2 * page_size);
-
-		if (wait_for_scan("Collapse PTE table with single page shared with parent process", p))
-			fail("Timeout");
-		else if (check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		validate_memory(p, 0, page_size);
-		munmap(p, hpage_pmd_size);
-		exit(exit_status);
-	}
-
-	wait(&wstatus);
-	exit_status += WEXITSTATUS(wstatus);
-
-	printf("Check if parent still has small page...");
-	if (!check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, page_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_fork_compound(void)
-{
-	int wstatus;
-	void *p;
-
-	p = alloc_mapping();
-
-	printf("Allocate huge page...");
-	madvise(p, hpage_pmd_size, MADV_HUGEPAGE);
-	fill_memory(p, 0, hpage_pmd_size);
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	printf("Share huge page over fork()...");
-	if (!fork()) {
-		/* Do not touch settings on child exit */
-		skip_settings_restore = true;
-		exit_status = 0;
-
-		if (check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		printf("Split huge page PMD in child process...");
-		madvise(p, page_size, MADV_NOHUGEPAGE);
-		madvise(p, hpage_pmd_size, MADV_NOHUGEPAGE);
-		if (!check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-		fill_memory(p, 0, page_size);
-
-		write_num("khugepaged/max_ptes_shared", hpage_pmd_nr - 1);
-		if (wait_for_scan("Collapse PTE table full of compound pages in child", p))
-			fail("Timeout");
-		else if (check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-		write_num("khugepaged/max_ptes_shared",
-				default_settings.khugepaged.max_ptes_shared);
-
-		validate_memory(p, 0, hpage_pmd_size);
-		munmap(p, hpage_pmd_size);
-		exit(exit_status);
-	}
-
-	wait(&wstatus);
-	exit_status += WEXITSTATUS(wstatus);
-
-	printf("Check if parent still has huge page...");
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, hpage_pmd_size);
-	munmap(p, hpage_pmd_size);
-}
-
-static void collapse_max_ptes_shared()
-{
-	int max_ptes_shared = read_num("khugepaged/max_ptes_shared");
-	int wstatus;
-	void *p;
-
-	p = alloc_mapping();
-
-	printf("Allocate huge page...");
-	madvise(p, hpage_pmd_size, MADV_HUGEPAGE);
-	fill_memory(p, 0, hpage_pmd_size);
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-
-	printf("Share huge page over fork()...");
-	if (!fork()) {
-		/* Do not touch settings on child exit */
-		skip_settings_restore = true;
-		exit_status = 0;
-
-		if (check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		printf("Trigger CoW on page %d of %d...",
-				hpage_pmd_nr - max_ptes_shared - 1, hpage_pmd_nr);
-		fill_memory(p, 0, (hpage_pmd_nr - max_ptes_shared - 1) * page_size);
-		if (!check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		if (wait_for_scan("Do not collapse with max_ptes_shared exceeded", p))
-			fail("Timeout");
-		else if (!check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		printf("Trigger CoW on page %d of %d...",
-				hpage_pmd_nr - max_ptes_shared, hpage_pmd_nr);
-		fill_memory(p, 0, (hpage_pmd_nr - max_ptes_shared) * page_size);
-		if (!check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-
-		if (wait_for_scan("Collapse with max_ptes_shared PTEs shared", p))
-			fail("Timeout");
-		else if (check_huge(p))
-			success("OK");
-		else
-			fail("Fail");
-
-		validate_memory(p, 0, hpage_pmd_size);
-		munmap(p, hpage_pmd_size);
-		exit(exit_status);
-	}
-
-	wait(&wstatus);
-	exit_status += WEXITSTATUS(wstatus);
-
-	printf("Check if parent still has huge page...");
-	if (check_huge(p))
-		success("OK");
-	else
-		fail("Fail");
-	validate_memory(p, 0, hpage_pmd_size);
-	munmap(p, hpage_pmd_size);
-}
-
-int main(void)
-{
-	setbuf(stdout, NULL);
-
-	page_size = getpagesize();
-	hpage_pmd_size = read_num("hpage_pmd_size");
-	hpage_pmd_nr = hpage_pmd_size / page_size;
-
-	default_settings.khugepaged.max_ptes_none = hpage_pmd_nr - 1;
-	default_settings.khugepaged.max_ptes_swap = hpage_pmd_nr / 8;
-	default_settings.khugepaged.max_ptes_shared = hpage_pmd_nr / 2;
-	default_settings.khugepaged.pages_to_scan = hpage_pmd_nr * 8;
-
-	save_settings();
-	adjust_settings();
-
-	alloc_at_fault();
-	collapse_full();
-	collapse_empty();
-	collapse_single_pte_entry();
-	collapse_max_ptes_none();
-	collapse_swapin_single_pte();
-	collapse_max_ptes_swap();
-	collapse_single_pte_entry_compound();
-	collapse_full_of_compound();
-	collapse_compound_extreme();
-	collapse_fork();
-	collapse_fork_compound();
-	collapse_max_ptes_shared();
-
-	restore_settings(0);
-}