This adds three new tests to the selftests for KSM. These tests use the
new prctl API's to enable and disable KSM.
1) add new prctl flags to prctl header file in tools dir
This adds the new prctl flags to the include file prct.h in the
tools directory. This makes sure they are available for testing.
2) add KSM prctl merge test to ksm_tests
This adds the -t option to the ksm_tests program. The -t flag
allows to specify if it should use madvise or prctl ksm merging.
3) add two functions for debugging merge outcome for ksm_tests
This adds two functions to report the metrics in /proc/self/ksm_stat
and /sys/kernel/debug/mm/ksm. The debug output is enabled with the
-d option.
4) add KSM prctl test to ksm_functional_tests
This adds a test to the ksm_functional_test that verifies that the
prctl system call to enable / disable KSM works.
5) add KSM fork test to ksm_functional_test
Add fork test to verify that the MMF_VM_MERGE_ANY flag is inherited
by the child process.
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
Cc: Bagas Sanjaya <bagasdotme@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/include/uapi/linux/prctl.h | 2 +
tools/testing/selftests/mm/Makefile | 2 +-
.../selftests/mm/ksm_functional_tests.c | 77 +++++++-
tools/testing/selftests/mm/ksm_tests.c | 175 ++++++++++++++----
4 files changed, 216 insertions(+), 40 deletions(-)
diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linux/prctl.h
index a5e06dcbba13..e4c629c1f1b0 100644
--- a/tools/include/uapi/linux/prctl.h
+++ b/tools/include/uapi/linux/prctl.h
@@ -284,4 +284,6 @@ struct prctl_mm_map {
#define PR_SET_VMA 0x53564d41
# define PR_SET_VMA_ANON_NAME 0
+#define PR_SET_MEMORY_MERGE 67
+#define PR_GET_MEMORY_MERGE 68
#endif /* _LINUX_PRCTL_H */
diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile
index c31d952cff68..fbf5646b1072 100644
--- a/tools/testing/selftests/mm/Makefile
+++ b/tools/testing/selftests/mm/Makefile
@@ -29,7 +29,7 @@ MACHINE ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/p
# LDLIBS.
MAKEFLAGS += --no-builtin-rules
-CFLAGS = -Wall -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES)
+CFLAGS = -Wall -I $(top_srcdir) -I $(top_srcdir)/tools/include/uapi $(EXTRA_CFLAGS) $(KHDR_INCLUDES)
LDLIBS = -lrt -lpthread
TEST_GEN_FILES = cow
TEST_GEN_FILES += compaction_test
diff --git a/tools/testing/selftests/mm/ksm_functional_tests.c b/tools/testing/selftests/mm/ksm_functional_tests.c
index 05048ebc24d8..9f81ff4db8e7 100644
--- a/tools/testing/selftests/mm/ksm_functional_tests.c
+++ b/tools/testing/selftests/mm/ksm_functional_tests.c
@@ -15,8 +15,10 @@
#include <errno.h>
#include <fcntl.h>
#include <sys/mman.h>
+#include <sys/prctl.h>
#include <sys/syscall.h>
#include <sys/ioctl.h>
+#include <sys/wait.h>
#include <linux/userfaultfd.h>
#include "../kselftest.h"
@@ -326,9 +328,80 @@ static void test_unmerge_uffd_wp(void)
}
#endif
+/* Verify that KSM can be enabled / queried with prctl. */
+static void test_ksm_prctl(void)
+{
+ bool ret = false;
+ int is_on;
+ int is_off;
+
+ ksft_print_msg("[RUN] %s\n", __func__);
+
+ if (prctl(PR_SET_MEMORY_MERGE, 1)) {
+ perror("prctl set");
+ goto out;
+ }
+
+ is_on = prctl(PR_GET_MEMORY_MERGE, 0);
+ if (prctl(PR_SET_MEMORY_MERGE, 0)) {
+ perror("prctl set");
+ goto out;
+ }
+
+ is_off = prctl(PR_GET_MEMORY_MERGE, 0);
+ if (is_on && is_off)
+ ret = true;
+
+out:
+ ksft_test_result(ret, "prctl get / set\n");
+}
+
+/* Verify that prctl ksm flag is inherited. */
+static void test_ksm_fork(void)
+{
+ int status;
+ bool ret = false;
+ pid_t child_pid;
+
+ ksft_print_msg("[RUN] %s\n", __func__);
+
+ if (prctl(PR_SET_MEMORY_MERGE, 1)) {
+ ksft_test_result_fail("prctl failed\n");
+ goto out;
+ }
+
+ child_pid = fork();
+ if (child_pid == 0) {
+ int is_on = prctl(PR_GET_MEMORY_MERGE, 0);
+
+ if (!is_on)
+ exit(-1);
+
+ exit(0);
+ }
+
+ if (child_pid < 0) {
+ ksft_test_result_fail("child pid < 0\n");
+ goto out;
+ }
+
+ if (waitpid(child_pid, &status, 0) < 0 || WEXITSTATUS(status) != 0) {
+ ksft_test_result_fail("wait pid < 0\n");
+ goto out;
+ }
+
+ if (prctl(PR_SET_MEMORY_MERGE, 0))
+ ksft_test_result_fail("prctl 2 failed\n");
+ else
+ ret = true;
+
+out:
+ ksft_test_result(ret, "ksm_flag is inherited\n");
+}
+
int main(int argc, char **argv)
{
- unsigned int tests = 2;
+ unsigned int tests = 6;
int err;
#ifdef __NR_userfaultfd
@@ -358,6 +431,8 @@ int main(int argc, char **argv)
#ifdef __NR_userfaultfd
test_unmerge_uffd_wp();
#endif
+ test_ksm_prctl();
+ test_ksm_fork();
err = ksft_get_fail_cnt();
if (err)
diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c
index f9eb4d67e0dd..35b3828d44b4 100644
--- a/tools/testing/selftests/mm/ksm_tests.c
+++ b/tools/testing/selftests/mm/ksm_tests.c
@@ -1,6 +1,8 @@
// SPDX-License-Identifier: GPL-2.0
#include <sys/mman.h>
+#include <sys/prctl.h>
+#include <sys/wait.h>
#include <stdbool.h>
#include <time.h>
#include <string.h>
@@ -21,6 +23,7 @@
#define KSM_PROT_STR_DEFAULT "rw"
#define KSM_USE_ZERO_PAGES_DEFAULT false
#define KSM_MERGE_ACROSS_NODES_DEFAULT true
+#define KSM_MERGE_TYPE_DEFAULT 0
#define MB (1ul << 20)
struct ksm_sysfs {
@@ -33,9 +36,16 @@ struct ksm_sysfs {
unsigned long use_zero_pages;
};
+enum ksm_merge_type {
+ KSM_MERGE_MADVISE,
+ KSM_MERGE_PRCTL,
+ KSM_MERGE_LAST = KSM_MERGE_PRCTL
+};
+
enum ksm_test_name {
CHECK_KSM_MERGE,
CHECK_KSM_UNMERGE,
+ CHECK_KSM_GET_MERGE_TYPE,
CHECK_KSM_ZERO_PAGE_MERGE,
CHECK_KSM_NUMA_MERGE,
KSM_MERGE_TIME,
@@ -44,6 +54,8 @@ enum ksm_test_name {
KSM_COW_TIME
};
+int debug = 0;
+
static int ksm_write_sysfs(const char *file_path, unsigned long val)
{
FILE *f = fopen(file_path, "w");
@@ -82,6 +94,53 @@ static int ksm_read_sysfs(const char *file_path, unsigned long *val)
return 0;
}
+static void ksm_print_sysfs(void)
+{
+ unsigned long max_page_sharing, pages_sharing, pages_shared;
+ unsigned long full_scans, pages_unshared, pages_volatile;
+ unsigned long stable_node_chains, stable_node_dups;
+ long general_profit;
+
+ if (ksm_read_sysfs(KSM_FP("pages_shared"), &pages_shared) ||
+ ksm_read_sysfs(KSM_FP("pages_sharing"), &pages_sharing) ||
+ ksm_read_sysfs(KSM_FP("max_page_sharing"), &max_page_sharing) ||
+ ksm_read_sysfs(KSM_FP("full_scans"), &full_scans) ||
+ ksm_read_sysfs(KSM_FP("pages_unshared"), &pages_unshared) ||
+ ksm_read_sysfs(KSM_FP("pages_volatile"), &pages_volatile) ||
+ ksm_read_sysfs(KSM_FP("stable_node_chains"), &stable_node_chains) ||
+ ksm_read_sysfs(KSM_FP("stable_node_dups"), &stable_node_dups) ||
+ ksm_read_sysfs(KSM_FP("general_profit"), (unsigned long *)&general_profit))
+ return;
+
+ printf("pages_shared : %lu\n", pages_shared);
+ printf("pages_sharing : %lu\n", pages_sharing);
+ printf("max_page_sharing : %lu\n", max_page_sharing);
+ printf("full_scans : %lu\n", full_scans);
+ printf("pages_unshared : %lu\n", pages_unshared);
+ printf("pages_volatile : %lu\n", pages_volatile);
+ printf("stable_node_chains: %lu\n", stable_node_chains);
+ printf("stable_node_dups : %lu\n", stable_node_dups);
+ printf("general_profit : %ld\n", general_profit);
+}
+
+static void ksm_print_procfs(void)
+{
+ const char *file_name = "/proc/self/ksm_stat";
+ char buffer[512];
+ FILE *f = fopen(file_name, "r");
+
+ if (!f) {
+ fprintf(stderr, "f %s\n", file_name);
+ perror("fopen");
+ return;
+ }
+
+ while (fgets(buffer, sizeof(buffer), f))
+ printf("%s", buffer);
+
+ fclose(f);
+}
+
static int str_to_prot(char *prot_str)
{
int prot = 0;
@@ -128,7 +187,12 @@ static void print_help(void)
" Default: %d\n", KSM_USE_ZERO_PAGES_DEFAULT);
printf(" -m: change merge_across_nodes tunable\n"
" Default: %d\n", KSM_MERGE_ACROSS_NODES_DEFAULT);
+ printf(" -d: turn debugging output on\n");
printf(" -s: the size of duplicated memory area (in MiB)\n");
+ printf(" -t: KSM merge type\n"
+ " Default: 0\n"
+ " 0: madvise merging\n"
+ " 1: prctl merging\n");
exit(0);
}
@@ -176,12 +240,21 @@ static int ksm_do_scan(int scan_count, struct timespec start_time, int timeout)
return 0;
}
-static int ksm_merge_pages(void *addr, size_t size, struct timespec start_time, int timeout)
+static int ksm_merge_pages(int merge_type, void *addr, size_t size,
+ struct timespec start_time, int timeout)
{
- if (madvise(addr, size, MADV_MERGEABLE)) {
- perror("madvise");
- return 1;
+ if (merge_type == KSM_MERGE_MADVISE) {
+ if (madvise(addr, size, MADV_MERGEABLE)) {
+ perror("madvise");
+ return 1;
+ }
+ } else if (merge_type == KSM_MERGE_PRCTL) {
+ if (prctl(PR_SET_MEMORY_MERGE, 1)) {
+ perror("prctl");
+ return 1;
+ }
}
+
if (ksm_write_sysfs(KSM_FP("run"), 1))
return 1;
@@ -211,6 +284,11 @@ static bool assert_ksm_pages_count(long dupl_page_count)
ksm_read_sysfs(KSM_FP("max_page_sharing"), &max_page_sharing))
return false;
+ if (debug) {
+ ksm_print_sysfs();
+ ksm_print_procfs();
+ }
+
/*
* Since there must be at least 2 pages for merging and 1 page can be
* shared with the limited number of pages (max_page_sharing), sometimes
@@ -266,7 +344,8 @@ static int ksm_restore(struct ksm_sysfs *ksm_sysfs)
return 0;
}
-static int check_ksm_merge(int mapping, int prot, long page_count, int timeout, size_t page_size)
+static int check_ksm_merge(int merge_type, int mapping, int prot,
+ long page_count, int timeout, size_t page_size)
{
void *map_ptr;
struct timespec start_time;
@@ -281,13 +360,16 @@ static int check_ksm_merge(int mapping, int prot, long page_count, int timeout,
if (!map_ptr)
return KSFT_FAIL;
- if (ksm_merge_pages(map_ptr, page_size * page_count, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, page_size * page_count, start_time, timeout))
goto err_out;
/* verify that the right number of pages are merged */
if (assert_ksm_pages_count(page_count)) {
printf("OK\n");
- munmap(map_ptr, page_size * page_count);
+ if (merge_type == KSM_MERGE_MADVISE)
+ munmap(map_ptr, page_size * page_count);
+ else if (merge_type == KSM_MERGE_PRCTL)
+ prctl(PR_SET_MEMORY_MERGE, 0);
return KSFT_PASS;
}
@@ -297,7 +379,7 @@ static int check_ksm_merge(int mapping, int prot, long page_count, int timeout,
return KSFT_FAIL;
}
-static int check_ksm_unmerge(int mapping, int prot, int timeout, size_t page_size)
+static int check_ksm_unmerge(int merge_type, int mapping, int prot, int timeout, size_t page_size)
{
void *map_ptr;
struct timespec start_time;
@@ -313,7 +395,7 @@ static int check_ksm_unmerge(int mapping, int prot, int timeout, size_t page_siz
if (!map_ptr)
return KSFT_FAIL;
- if (ksm_merge_pages(map_ptr, page_size * page_count, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, page_size * page_count, start_time, timeout))
goto err_out;
/* change 1 byte in each of the 2 pages -- KSM must automatically unmerge them */
@@ -337,8 +419,8 @@ static int check_ksm_unmerge(int mapping, int prot, int timeout, size_t page_siz
return KSFT_FAIL;
}
-static int check_ksm_zero_page_merge(int mapping, int prot, long page_count, int timeout,
- bool use_zero_pages, size_t page_size)
+static int check_ksm_zero_page_merge(int merge_type, int mapping, int prot, long page_count,
+ int timeout, bool use_zero_pages, size_t page_size)
{
void *map_ptr;
struct timespec start_time;
@@ -356,7 +438,7 @@ static int check_ksm_zero_page_merge(int mapping, int prot, long page_count, int
if (!map_ptr)
return KSFT_FAIL;
- if (ksm_merge_pages(map_ptr, page_size * page_count, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, page_size * page_count, start_time, timeout))
goto err_out;
/*
@@ -402,8 +484,8 @@ static int get_first_mem_node(void)
return get_next_mem_node(numa_max_node());
}
-static int check_ksm_numa_merge(int mapping, int prot, int timeout, bool merge_across_nodes,
- size_t page_size)
+static int check_ksm_numa_merge(int merge_type, int mapping, int prot, int timeout,
+ bool merge_across_nodes, size_t page_size)
{
void *numa1_map_ptr, *numa2_map_ptr;
struct timespec start_time;
@@ -439,8 +521,8 @@ static int check_ksm_numa_merge(int mapping, int prot, int timeout, bool merge_a
memset(numa2_map_ptr, '*', page_size);
/* try to merge the pages */
- if (ksm_merge_pages(numa1_map_ptr, page_size, start_time, timeout) ||
- ksm_merge_pages(numa2_map_ptr, page_size, start_time, timeout))
+ if (ksm_merge_pages(merge_type, numa1_map_ptr, page_size, start_time, timeout) ||
+ ksm_merge_pages(merge_type, numa2_map_ptr, page_size, start_time, timeout))
goto err_out;
/*
@@ -466,7 +548,8 @@ static int check_ksm_numa_merge(int mapping, int prot, int timeout, bool merge_a
return KSFT_FAIL;
}
-static int ksm_merge_hugepages_time(int mapping, int prot, int timeout, size_t map_size)
+static int ksm_merge_hugepages_time(int merge_type, int mapping, int prot,
+ int timeout, size_t map_size)
{
void *map_ptr, *map_ptr_orig;
struct timespec start_time, end_time;
@@ -508,7 +591,7 @@ static int ksm_merge_hugepages_time(int mapping, int prot, int timeout, size_t m
perror("clock_gettime");
goto err_out;
}
- if (ksm_merge_pages(map_ptr, map_size, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, map_size, start_time, timeout))
goto err_out;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &end_time)) {
perror("clock_gettime");
@@ -533,7 +616,7 @@ static int ksm_merge_hugepages_time(int mapping, int prot, int timeout, size_t m
return KSFT_FAIL;
}
-static int ksm_merge_time(int mapping, int prot, int timeout, size_t map_size)
+static int ksm_merge_time(int merge_type, int mapping, int prot, int timeout, size_t map_size)
{
void *map_ptr;
struct timespec start_time, end_time;
@@ -549,7 +632,7 @@ static int ksm_merge_time(int mapping, int prot, int timeout, size_t map_size)
perror("clock_gettime");
goto err_out;
}
- if (ksm_merge_pages(map_ptr, map_size, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, map_size, start_time, timeout))
goto err_out;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &end_time)) {
perror("clock_gettime");
@@ -574,7 +657,7 @@ static int ksm_merge_time(int mapping, int prot, int timeout, size_t map_size)
return KSFT_FAIL;
}
-static int ksm_unmerge_time(int mapping, int prot, int timeout, size_t map_size)
+static int ksm_unmerge_time(int merge_type, int mapping, int prot, int timeout, size_t map_size)
{
void *map_ptr;
struct timespec start_time, end_time;
@@ -589,7 +672,7 @@ static int ksm_unmerge_time(int mapping, int prot, int timeout, size_t map_size)
perror("clock_gettime");
goto err_out;
}
- if (ksm_merge_pages(map_ptr, map_size, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, map_size, start_time, timeout))
goto err_out;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &start_time)) {
@@ -621,7 +704,7 @@ static int ksm_unmerge_time(int mapping, int prot, int timeout, size_t map_size)
return KSFT_FAIL;
}
-static int ksm_cow_time(int mapping, int prot, int timeout, size_t page_size)
+static int ksm_cow_time(int merge_type, int mapping, int prot, int timeout, size_t page_size)
{
void *map_ptr;
struct timespec start_time, end_time;
@@ -660,7 +743,7 @@ static int ksm_cow_time(int mapping, int prot, int timeout, size_t page_size)
memset(map_ptr + page_size * i, '+', i / 2 + 1);
memset(map_ptr + page_size * (i + 1), '+', i / 2 + 1);
}
- if (ksm_merge_pages(map_ptr, page_size * page_count, start_time, timeout))
+ if (ksm_merge_pages(merge_type, map_ptr, page_size * page_count, start_time, timeout))
goto err_out;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &start_time)) {
@@ -697,6 +780,7 @@ int main(int argc, char *argv[])
int ret, opt;
int prot = 0;
int ksm_scan_limit_sec = KSM_SCAN_LIMIT_SEC_DEFAULT;
+ int merge_type = KSM_MERGE_TYPE_DEFAULT;
long page_count = KSM_PAGE_COUNT_DEFAULT;
size_t page_size = sysconf(_SC_PAGESIZE);
struct ksm_sysfs ksm_sysfs_old;
@@ -705,7 +789,7 @@ int main(int argc, char *argv[])
bool merge_across_nodes = KSM_MERGE_ACROSS_NODES_DEFAULT;
long size_MB = 0;
- while ((opt = getopt(argc, argv, "ha:p:l:z:m:s:MUZNPCHD")) != -1) {
+ while ((opt = getopt(argc, argv, "dha:p:l:z:m:s:t:MUZNPCHD")) != -1) {
switch (opt) {
case 'a':
prot = str_to_prot(optarg);
@@ -739,12 +823,26 @@ int main(int argc, char *argv[])
else
merge_across_nodes = 1;
break;
+ case 'd':
+ debug = 1;
+ break;
case 's':
size_MB = atoi(optarg);
if (size_MB <= 0) {
printf("Size must be greater than 0\n");
return KSFT_FAIL;
}
+ case 't':
+ {
+ int tmp = atoi(optarg);
+
+ if (tmp < 0 || tmp > KSM_MERGE_LAST) {
+ printf("Invalid merge type\n");
+ return KSFT_FAIL;
+ }
+ merge_type = atoi(optarg);
+ }
+ break;
case 'M':
break;
case 'U':
@@ -795,35 +893,36 @@ int main(int argc, char *argv[])
switch (test_name) {
case CHECK_KSM_MERGE:
- ret = check_ksm_merge(MAP_PRIVATE | MAP_ANONYMOUS, prot, page_count,
+ ret = check_ksm_merge(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot, page_count,
ksm_scan_limit_sec, page_size);
break;
case CHECK_KSM_UNMERGE:
- ret = check_ksm_unmerge(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
- page_size);
+ ret = check_ksm_unmerge(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ ksm_scan_limit_sec, page_size);
break;
case CHECK_KSM_ZERO_PAGE_MERGE:
- ret = check_ksm_zero_page_merge(MAP_PRIVATE | MAP_ANONYMOUS, prot, page_count,
- ksm_scan_limit_sec, use_zero_pages, page_size);
+ ret = check_ksm_zero_page_merge(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ page_count, ksm_scan_limit_sec, use_zero_pages,
+ page_size);
break;
case CHECK_KSM_NUMA_MERGE:
- ret = check_ksm_numa_merge(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
- merge_across_nodes, page_size);
+ ret = check_ksm_numa_merge(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ ksm_scan_limit_sec, merge_across_nodes, page_size);
break;
case KSM_MERGE_TIME:
if (size_MB == 0) {
printf("Option '-s' is required.\n");
return KSFT_FAIL;
}
- ret = ksm_merge_time(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
- size_MB);
+ ret = ksm_merge_time(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ ksm_scan_limit_sec, size_MB);
break;
case KSM_MERGE_TIME_HUGE_PAGES:
if (size_MB == 0) {
printf("Option '-s' is required.\n");
return KSFT_FAIL;
}
- ret = ksm_merge_hugepages_time(MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ ret = ksm_merge_hugepages_time(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
ksm_scan_limit_sec, size_MB);
break;
case KSM_UNMERGE_TIME:
@@ -831,12 +930,12 @@ int main(int argc, char *argv[])
printf("Option '-s' is required.\n");
return KSFT_FAIL;
}
- ret = ksm_unmerge_time(MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ ret = ksm_unmerge_time(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
ksm_scan_limit_sec, size_MB);
break;
case KSM_COW_TIME:
- ret = ksm_cow_time(MAP_PRIVATE | MAP_ANONYMOUS, prot, ksm_scan_limit_sec,
- page_size);
+ ret = ksm_cow_time(merge_type, MAP_PRIVATE | MAP_ANONYMOUS, prot,
+ ksm_scan_limit_sec, page_size);
break;
}
--
2.31.1
