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.
Cc: Shuah Khan shuah@kernel.org Cc: Catalin Marinas catalin.marinas@arm.com Cc: Will Deacon will@kernel.org Signed-off-by: Amit Daniel Kachhap amit.kachhap@arm.com --- tools/testing/selftests/arm64/mte/.gitignore | 1 + .../selftests/arm64/mte/check_ksm_options.c | 131 ++++++++++++++++++ 2 files changed, 132 insertions(+) create mode 100644 tools/testing/selftests/arm64/mte/check_ksm_options.c
diff --git a/tools/testing/selftests/arm64/mte/.gitignore b/tools/testing/selftests/arm64/mte/.gitignore index 79a215d3bbd0..44e9bfdaeca6 100644 --- a/tools/testing/selftests/arm64/mte/.gitignore +++ b/tools/testing/selftests/arm64/mte/.gitignore @@ -2,3 +2,4 @@ check_buffer_fill check_tags_inclusion check_child_memory check_mmap_options +check_ksm_options diff --git a/tools/testing/selftests/arm64/mte/check_ksm_options.c b/tools/testing/selftests/arm64/mte/check_ksm_options.c new file mode 100644 index 000000000000..33fcf77f3501 --- /dev/null +++ b/tools/testing/selftests/arm64/mte/check_ksm_options.c @@ -0,0 +1,131 @@ +// 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 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) { + sleep(1); + cur_count = read_sysfs(PATH_KSM "full_scans"); + max_loop_count--; + } +#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")); +#endif +} + +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; + } + mte_ksm_scan(); + /* 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; +madvise_err: + 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 */ + mte_ksm_setup(); + + 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"); + + mte_ksm_restore(); + mte_restore_setup(); + ksft_print_cnts(); + return ksft_get_fail_cnt() == 0 ? KSFT_PASS : KSFT_FAIL; +}