Commit f981d8fa authored by Amit Kachhap's avatar Amit Kachhap Committed by Will Deacon
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kselftest/arm64: Verify KSM page merge for MTE pages

Add a testcase to check that KSM should not merge pages containing
same data with same/different MTE tag values.

This testcase has one positive tests and passes if page merging
happens according to the above rule. It also saves and restores
any modified ksm sysfs entries.

Signed-off-by: Amit Kachhap's avatarAmit Daniel Kachhap <>
Tested-by: Catalin Marinas's avatarCatalin Marinas <>
Acked-by: Catalin Marinas's avatarCatalin Marinas <>
Cc: Shuah Khan <>
Cc: Catalin Marinas <>
Cc: Will Deacon <>

Signed-off-by: default avatarWill Deacon <>
parent 53ec81d2
......@@ -2,3 +2,4 @@ check_buffer_fill
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2020 ARM Limited
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ucontext.h>
#include <sys/mman.h>
#include "kselftest.h"
#include "mte_common_util.h"
#include "mte_def.h"
#define TEST_UNIT 10
#define PATH_KSM "/sys/kernel/mm/ksm/"
#define MAX_LOOP 4
static size_t page_sz;
static unsigned long ksm_sysfs[5];
static unsigned long read_sysfs(char *str)
FILE *f;
unsigned long val = 0;
f = fopen(str, "r");
if (!f) {
ksft_print_msg("ERR: missing %s\n", str);
return 0;
fscanf(f, "%lu", &val);
return val;
static void write_sysfs(char *str, unsigned long val)
FILE *f;
f = fopen(str, "w");
if (!f) {
ksft_print_msg("ERR: missing %s\n", str);
fprintf(f, "%lu", val);
static void mte_ksm_setup(void)
ksm_sysfs[0] = read_sysfs(PATH_KSM "merge_across_nodes");
write_sysfs(PATH_KSM "merge_across_nodes", 1);
ksm_sysfs[1] = read_sysfs(PATH_KSM "sleep_millisecs");
write_sysfs(PATH_KSM "sleep_millisecs", 0);
ksm_sysfs[2] = read_sysfs(PATH_KSM "run");
write_sysfs(PATH_KSM "run", 1);
ksm_sysfs[3] = read_sysfs(PATH_KSM "max_page_sharing");
write_sysfs(PATH_KSM "max_page_sharing", ksm_sysfs[3] + TEST_UNIT);
ksm_sysfs[4] = read_sysfs(PATH_KSM "pages_to_scan");
write_sysfs(PATH_KSM "pages_to_scan", ksm_sysfs[4] + TEST_UNIT);
static void mte_ksm_restore(void)
write_sysfs(PATH_KSM "merge_across_nodes", ksm_sysfs[0]);
write_sysfs(PATH_KSM "sleep_millisecs", ksm_sysfs[1]);
write_sysfs(PATH_KSM "run", ksm_sysfs[2]);
write_sysfs(PATH_KSM "max_page_sharing", ksm_sysfs[3]);
write_sysfs(PATH_KSM "pages_to_scan", ksm_sysfs[4]);
static void mte_ksm_scan(void)
int cur_count = read_sysfs(PATH_KSM "full_scans");
int scan_count = cur_count + 1;
int max_loop_count = MAX_LOOP;
while ((cur_count < scan_count) && max_loop_count) {
cur_count = read_sysfs(PATH_KSM "full_scans");
#ifdef DEBUG
ksft_print_msg("INFO: pages_shared=%lu pages_sharing=%lu\n",
read_sysfs(PATH_KSM "pages_shared"),
read_sysfs(PATH_KSM "pages_sharing"));
static int check_madvise_options(int mem_type, int mode, int mapping)
char *ptr;
int err, ret;
err = KSFT_FAIL;
if (access(PATH_KSM, F_OK) == -1) {
ksft_print_msg("ERR: Kernel KSM config not enabled\n");
return err;
mte_switch_mode(mode, MTE_ALLOW_NON_ZERO_TAG);
ptr = mte_allocate_memory(TEST_UNIT * page_sz, mem_type, mapping, true);
if (check_allocated_memory(ptr, TEST_UNIT * page_sz, mem_type, false) != KSFT_PASS)
return KSFT_FAIL;
/* Insert same data in all the pages */
memset(ptr, 'A', TEST_UNIT * page_sz);
ret = madvise(ptr, TEST_UNIT * page_sz, MADV_MERGEABLE);
if (ret) {
ksft_print_msg("ERR: madvise failed to set MADV_UNMERGEABLE\n");
goto madvise_err;
/* Tagged pages should not merge */
if ((read_sysfs(PATH_KSM "pages_shared") < 1) ||
(read_sysfs(PATH_KSM "pages_sharing") < (TEST_UNIT - 1)))
err = KSFT_PASS;
mte_free_memory(ptr, TEST_UNIT * page_sz, mem_type, true);
return err;
int main(int argc, char *argv[])
int err;
err = mte_default_setup();
if (err)
return err;
page_sz = getpagesize();
if (!page_sz) {
ksft_print_msg("ERR: Unable to get page size\n");
return KSFT_FAIL;
/* Register signal handlers */
mte_register_signal(SIGBUS, mte_default_handler);
mte_register_signal(SIGSEGV, mte_default_handler);
/* Enable KSM */
evaluate_test(check_madvise_options(USE_MMAP, MTE_SYNC_ERR, MAP_PRIVATE),
"Check KSM mte page merge for private mapping, sync mode and mmap memory\n");
evaluate_test(check_madvise_options(USE_MMAP, MTE_ASYNC_ERR, MAP_PRIVATE),
"Check KSM mte page merge for private mapping, async mode and mmap memory\n");
evaluate_test(check_madvise_options(USE_MMAP, MTE_SYNC_ERR, MAP_SHARED),
"Check KSM mte page merge for shared mapping, sync mode and mmap memory\n");
evaluate_test(check_madvise_options(USE_MMAP, MTE_ASYNC_ERR, MAP_SHARED),
"Check KSM mte page merge for shared mapping, async mode and mmap memory\n");
return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL;
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