Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Gabriel Krisman Bertazi | 725 | 72.86% | 1 | 16.67% |
Peter Xu | 251 | 25.23% | 1 | 16.67% |
David Hildenbrand | 10 | 1.01% | 1 | 16.67% |
Zach O'Keefe | 5 | 0.50% | 1 | 16.67% |
Vitaly Chikunov | 2 | 0.20% | 1 | 16.67% |
Ryan Roberts | 2 | 0.20% | 1 | 16.67% |
Total | 995 | 6 |
// SPDX-License-Identifier: GPL-2.0 #include <stdio.h> #include <string.h> #include <stdbool.h> #include <fcntl.h> #include <stdint.h> #include <malloc.h> #include <sys/mman.h> #include "../kselftest.h" #include "vm_util.h" #define PAGEMAP_FILE_PATH "/proc/self/pagemap" #define TEST_ITERATIONS 10000 static void test_simple(int pagemap_fd, int pagesize) { int i; char *map; map = aligned_alloc(pagesize, pagesize); if (!map) ksft_exit_fail_msg("mmap failed\n"); clear_softdirty(); for (i = 0 ; i < TEST_ITERATIONS; i++) { if (pagemap_is_softdirty(pagemap_fd, map) == 1) { ksft_print_msg("dirty bit was 1, but should be 0 (i=%d)\n", i); break; } clear_softdirty(); // Write something to the page to get the dirty bit enabled on the page map[0]++; if (pagemap_is_softdirty(pagemap_fd, map) == 0) { ksft_print_msg("dirty bit was 0, but should be 1 (i=%d)\n", i); break; } clear_softdirty(); } free(map); ksft_test_result(i == TEST_ITERATIONS, "Test %s\n", __func__); } static void test_vma_reuse(int pagemap_fd, int pagesize) { char *map, *map2; map = mmap(NULL, pagesize, (PROT_READ | PROT_WRITE), (MAP_PRIVATE | MAP_ANON), -1, 0); if (map == MAP_FAILED) ksft_exit_fail_msg("mmap failed"); // The kernel always marks new regions as soft dirty ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 1, "Test %s dirty bit of allocated page\n", __func__); clear_softdirty(); munmap(map, pagesize); map2 = mmap(NULL, pagesize, (PROT_READ | PROT_WRITE), (MAP_PRIVATE | MAP_ANON), -1, 0); if (map2 == MAP_FAILED) ksft_exit_fail_msg("mmap failed"); // Dirty bit is set for new regions even if they are reused if (map == map2) ksft_test_result(pagemap_is_softdirty(pagemap_fd, map2) == 1, "Test %s dirty bit of reused address page\n", __func__); else ksft_test_result_skip("Test %s dirty bit of reused address page\n", __func__); munmap(map2, pagesize); } static void test_hugepage(int pagemap_fd, int pagesize) { char *map; int i, ret; size_t hpage_len = read_pmd_pagesize(); if (!hpage_len) ksft_exit_fail_msg("Reading PMD pagesize failed"); map = memalign(hpage_len, hpage_len); if (!map) ksft_exit_fail_msg("memalign failed\n"); ret = madvise(map, hpage_len, MADV_HUGEPAGE); if (ret) ksft_exit_fail_msg("madvise failed %d\n", ret); for (i = 0; i < hpage_len; i++) map[i] = (char)i; if (check_huge_anon(map, 1, hpage_len)) { ksft_test_result_pass("Test %s huge page allocation\n", __func__); clear_softdirty(); for (i = 0 ; i < TEST_ITERATIONS ; i++) { if (pagemap_is_softdirty(pagemap_fd, map) == 1) { ksft_print_msg("dirty bit was 1, but should be 0 (i=%d)\n", i); break; } clear_softdirty(); // Write something to the page to get the dirty bit enabled on the page map[0]++; if (pagemap_is_softdirty(pagemap_fd, map) == 0) { ksft_print_msg("dirty bit was 0, but should be 1 (i=%d)\n", i); break; } clear_softdirty(); } ksft_test_result(i == TEST_ITERATIONS, "Test %s huge page dirty bit\n", __func__); } else { // hugepage allocation failed. skip these tests ksft_test_result_skip("Test %s huge page allocation\n", __func__); ksft_test_result_skip("Test %s huge page dirty bit\n", __func__); } free(map); } static void test_mprotect(int pagemap_fd, int pagesize, bool anon) { const char *type[] = {"file", "anon"}; const char *fname = "./soft-dirty-test-file"; int test_fd; char *map; if (anon) { map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, MAP_ANONYMOUS|MAP_PRIVATE, -1, 0); if (!map) ksft_exit_fail_msg("anon mmap failed\n"); } else { test_fd = open(fname, O_RDWR | O_CREAT, 0664); if (test_fd < 0) { ksft_test_result_skip("Test %s open() file failed\n", __func__); return; } unlink(fname); ftruncate(test_fd, pagesize); map = mmap(NULL, pagesize, PROT_READ|PROT_WRITE, MAP_SHARED, test_fd, 0); if (!map) ksft_exit_fail_msg("file mmap failed\n"); } *map = 1; ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 1, "Test %s-%s dirty bit of new written page\n", __func__, type[anon]); clear_softdirty(); ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 0, "Test %s-%s soft-dirty clear after clear_refs\n", __func__, type[anon]); mprotect(map, pagesize, PROT_READ); ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 0, "Test %s-%s soft-dirty clear after marking RO\n", __func__, type[anon]); mprotect(map, pagesize, PROT_READ|PROT_WRITE); ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 0, "Test %s-%s soft-dirty clear after marking RW\n", __func__, type[anon]); *map = 2; ksft_test_result(pagemap_is_softdirty(pagemap_fd, map) == 1, "Test %s-%s soft-dirty after rewritten\n", __func__, type[anon]); munmap(map, pagesize); if (!anon) close(test_fd); } static void test_mprotect_anon(int pagemap_fd, int pagesize) { test_mprotect(pagemap_fd, pagesize, true); } static void test_mprotect_file(int pagemap_fd, int pagesize) { test_mprotect(pagemap_fd, pagesize, false); } int main(int argc, char **argv) { int pagemap_fd; int pagesize; ksft_print_header(); ksft_set_plan(15); pagemap_fd = open(PAGEMAP_FILE_PATH, O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_msg("Failed to open %s\n", PAGEMAP_FILE_PATH); pagesize = getpagesize(); test_simple(pagemap_fd, pagesize); test_vma_reuse(pagemap_fd, pagesize); test_hugepage(pagemap_fd, pagesize); test_mprotect_anon(pagemap_fd, pagesize); test_mprotect_file(pagemap_fd, pagesize); close(pagemap_fd); ksft_finished(); }
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