From ca3d76b0aa808a06997297d123b66d17b81e5285 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jakub=20Mat=C4=9Bna?= Date: Fri, 3 Jun 2022 16:57:19 +0200 Subject: mm: add merging after mremap resize MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When mremap call results in expansion, it might be possible to merge the VMA with the next VMA which might become adjacent. This patch adds vma_merge call after the expansion is done to try and merge. [akpm@linux-foundation.org: coding-style cleanups] Link: https://lkml.kernel.org/r/20220603145719.1012094-3-matenajakub@gmail.com Signed-off-by: Jakub Matěna Reviewed-by: Vlastimil Babka Cc: Hugh Dickins Cc: "Kirill A . Shutemov" Cc: Liam Howlett Cc: Matthew Wilcox Cc: Mel Gorman Cc: Michal Hocko Cc: Peter Zijlstra (Intel) Cc: Rik van Riel Cc: Steven Rostedt Signed-off-by: Andrew Morton --- tools/testing/selftests/vm/mremap_test.c | 49 +++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) (limited to 'tools/testing') diff --git a/tools/testing/selftests/vm/mremap_test.c b/tools/testing/selftests/vm/mremap_test.c index db0270127aeb..9496346973d4 100644 --- a/tools/testing/selftests/vm/mremap_test.c +++ b/tools/testing/selftests/vm/mremap_test.c @@ -118,6 +118,50 @@ static unsigned long long get_mmap_min_addr(void) return addr; } +/* + * This test validates that merge is called when expanding a mapping. + * Mapping containing three pages is created, middle page is unmapped + * and then the mapping containing the first page is expanded so that + * it fills the created hole. The two parts should merge creating + * single mapping with three pages. + */ +static void mremap_expand_merge(unsigned long page_size) +{ + char *test_name = "mremap expand merge"; + FILE *fp; + char *line = NULL; + size_t len = 0; + bool success = false; + char *start = mmap(NULL, 3 * page_size, PROT_READ | PROT_WRITE, + MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + + munmap(start + page_size, page_size); + mremap(start, page_size, 2 * page_size, 0); + + fp = fopen("/proc/self/maps", "r"); + if (fp == NULL) { + ksft_test_result_fail("%s\n", test_name); + return; + } + + while (getline(&line, &len, fp) != -1) { + char *first = strtok(line, "- "); + void *first_val = (void *)strtol(first, NULL, 16); + char *second = strtok(NULL, "- "); + void *second_val = (void *) strtol(second, NULL, 16); + + if (first_val == start && second_val == start + 3 * page_size) { + success = true; + break; + } + } + if (success) + ksft_test_result_pass("%s\n", test_name); + else + ksft_test_result_fail("%s\n", test_name); + fclose(fp); +} + /* * Returns the start address of the mapping on success, else returns * NULL on failure. @@ -336,6 +380,7 @@ int main(int argc, char **argv) int i, run_perf_tests; unsigned int threshold_mb = VALIDATION_DEFAULT_THRESHOLD; unsigned int pattern_seed; + int num_expand_tests = 1; struct test test_cases[MAX_TEST]; struct test perf_test_cases[MAX_PERF_TEST]; int page_size; @@ -407,12 +452,14 @@ int main(int argc, char **argv) (threshold_mb * _1MB >= _1GB); ksft_set_plan(ARRAY_SIZE(test_cases) + (run_perf_tests ? - ARRAY_SIZE(perf_test_cases) : 0)); + ARRAY_SIZE(perf_test_cases) : 0) + num_expand_tests); for (i = 0; i < ARRAY_SIZE(test_cases); i++) run_mremap_test_case(test_cases[i], &failures, threshold_mb, pattern_seed); + mremap_expand_merge(page_size); + if (run_perf_tests) { ksft_print_msg("\n%s\n", "mremap HAVE_MOVE_PMD/PUD optimization time comparison for 1GB region:"); -- cgit v1.2.3