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Howlett" , Lance Yang , Leon Romanovsky , Lorenzo Stoakes , Mark Brown , Michal Hocko , Mike Rapoport , Nico Pache , Peter Xu , Ryan Roberts , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , Zi Yan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 05/53] selftests/mm: merge map_hugetlb into hugepage-mmap Date: Mon, 6 Apr 2026 17:16:47 +0300 Message-ID: <20260406141735.2179309-6-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260406141735.2179309-1-rppt@kernel.org> References: <20260406141735.2179309-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: F1B8A40014 X-Stat-Signature: s6qwy5ejfrsg9ygfp5sed4ujjbuq6qym X-Rspam-User: X-HE-Tag: 1775485095-95284 X-HE-Meta: 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 2JmVghHD 1xymgcdkgii6S+E/NcKpKTTuhEly0JAmft1DhUbMlg46s8iSRZjqLQL2O1GIBstSv8mviTXsXOlUYQno1pxRD0eUGLI+Vlp6cLXokRKC6JN6ald8FXtobN9vfcy0kZJ5xyh41vZDG4jcbvQJRBPNF1zoCSvdfpaQn1prVElkBUTUQIBqh3YMyCSEpE5/fbWq7eBatUmVa0lB/2u9vtBBqLLqSMfJULRjunDHHN8kbMtQRdMzncH/v1RDvs0rhDqVkps6ZpOiWGDz5psMWu9ftPx1MwAZoJy8Ymb/M Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: "Mike Rapoport (Microsoft)" Both tests create a hugettlb mapping, fill it with data and verify the data, the only difference is that one uses file-backed memory and another one uses anonymous memory. Merge both tests into a single file. Signed-off-by: Mike Rapoport (Microsoft) --- tools/testing/selftests/mm/Makefile | 1 - tools/testing/selftests/mm/hugepage-mmap.c | 113 ++++++++++++++++----- tools/testing/selftests/mm/map_hugetlb.c | 88 ---------------- tools/testing/selftests/mm/run_vmtests.sh | 1 - 4 files changed, 86 insertions(+), 117 deletions(-) delete mode 100644 tools/testing/selftests/mm/map_hugetlb.c diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index cd24596cdd27..cbda989f6b6a 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -70,7 +70,6 @@ TEST_GEN_FILES += hugepage-vmemmap TEST_GEN_FILES += khugepaged TEST_GEN_FILES += madv_populate TEST_GEN_FILES += map_fixed_noreplace -TEST_GEN_FILES += map_hugetlb TEST_GEN_FILES += map_populate ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loongarch64)) TEST_GEN_FILES += memfd_secret diff --git a/tools/testing/selftests/mm/hugepage-mmap.c b/tools/testing/selftests/mm/hugepage-mmap.c index d543419de040..de210043045a 100644 --- a/tools/testing/selftests/mm/hugepage-mmap.c +++ b/tools/testing/selftests/mm/hugepage-mmap.c @@ -15,6 +15,7 @@ #include #include #include +#include "vm_util.h" #include "kselftest.h" #define LENGTH (256UL*1024*1024) @@ -25,54 +26,112 @@ static void check_bytes(char *addr) ksft_print_msg("First hex is %x\n", *((unsigned int *)addr)); } -static void write_bytes(char *addr) +static void write_bytes(char *addr, size_t length) { unsigned long i; - for (i = 0; i < LENGTH; i++) + for (i = 0; i < length; i++) *(addr + i) = (char)i; } -static int read_bytes(char *addr) +static bool verify_bytes(char *addr, size_t length) { unsigned long i; check_bytes(addr); - for (i = 0; i < LENGTH; i++) - if (*(addr + i) != (char)i) { - ksft_print_msg("Error: Mismatch at %lu\n", i); - return 1; - } - return 0; + for (i = 0; i < length; i++) + if (*(addr + i) != (char)i) + return false; + + return true; } -int main(void) +static bool test_mmap(size_t length, int mmap_flags, int fd, + const char *test_name) { + int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB; void *addr; - int fd, ret; - ksft_print_header(); - ksft_set_plan(1); + addr = mmap(NULL, length, PROTECTION, flags, -1, 0); + if (addr == MAP_FAILED) + ksft_exit_fail_perror("mmap"); + + ksft_print_msg("Returned address is %p\n", addr); + check_bytes(addr); + write_bytes(addr, length); + if (!verify_bytes(addr, length)) + ksft_exit_fail_msg("%s\n", test_name); + + /* munmap() length of MAP_HUGETLB memory must be hugepage aligned */ + if (munmap(addr, length)) + ksft_exit_fail_perror("munmap"); + + return true; +} + +static void test_anon_mmap(size_t length, int shift) +{ + const char *test_name = "hugetlb anonymous mmap"; + int mmap_flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB; + bool passed; + + if (shift) + mmap_flags |= (shift & MAP_HUGE_MASK) << MAP_HUGE_SHIFT; + + passed = test_mmap(length, mmap_flags, -1, test_name); + ksft_test_result(passed, "%s\n", test_name); +} + +static void test_file_mmap(size_t length, int shift) +{ + const char *test_name = "hugetlb file mmap"; + int mmap_flags = MAP_SHARED; + bool passed; + int fd; + + if (shift) + mmap_flags |= (shift & MAP_HUGE_MASK) << MAP_HUGE_SHIFT; - fd = memfd_create("hugepage-mmap", MFD_HUGETLB); + fd = memfd_create("hugetlb-mmap", MFD_HUGETLB); if (fd < 0) - ksft_exit_fail_msg("memfd_create() failed: %s\n", strerror(errno)); + ksft_exit_fail_perror("memfd_create"); + + passed = test_mmap(length, mmap_flags, fd, test_name); + + close(fd); + ksft_test_result(passed, "%s\n", test_name); +} + +int main(int argc, char **argv) +{ + size_t hugepage_size; + size_t length = LENGTH; + int shift = 0; + + ksft_print_header(); + ksft_set_plan(2); + + if (argc > 1) + length = atol(argv[1]) << 20; + if (argc > 2) + shift = atoi(argv[2]); - addr = mmap(NULL, LENGTH, PROTECTION, MAP_SHARED, fd, 0); - if (addr == MAP_FAILED) { - close(fd); - ksft_exit_fail_msg("mmap(): %s\n", strerror(errno)); + if (shift) { + hugepage_size = (1 << shift); + ksft_print_msg("%u kB hugepages\n", 1 << (shift - 10)); + } else { + hugepage_size = default_huge_page_size(); + ksft_print_msg("Default size hugepages (%lu Kb)\n", hugepage_size >> 10); } - ksft_print_msg("Returned address is %p\n", addr); - check_bytes(addr); - write_bytes(addr); - ret = read_bytes(addr); + /* munmap with fail if the length is not page aligned */ + if (hugepage_size > length) + length = hugepage_size; - munmap(addr, LENGTH); - close(fd); + ksft_print_msg("Mapping %lu Mbytes\n", (unsigned long)length >> 20); - ksft_test_result(!ret, "Read same data\n"); + test_anon_mmap(length, shift); + test_file_mmap(length, shift); - ksft_exit(!ret); + ksft_finished(); } diff --git a/tools/testing/selftests/mm/map_hugetlb.c b/tools/testing/selftests/mm/map_hugetlb.c deleted file mode 100644 index aa409107611b..000000000000 --- a/tools/testing/selftests/mm/map_hugetlb.c +++ /dev/null @@ -1,88 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Example of using hugepage memory in a user application using the mmap - * system call with MAP_HUGETLB flag. Before running this program make - * sure the administrator has allocated enough default sized huge pages - * to cover the 256 MB allocation. - */ -#include -#include -#include -#include -#include -#include "vm_util.h" -#include "kselftest.h" - -#define LENGTH (256UL*1024*1024) -#define PROTECTION (PROT_READ | PROT_WRITE) - -static void check_bytes(char *addr) -{ - ksft_print_msg("First hex is %x\n", *((unsigned int *)addr)); -} - -static void write_bytes(char *addr, size_t length) -{ - unsigned long i; - - for (i = 0; i < length; i++) - *(addr + i) = (char)i; -} - -static void read_bytes(char *addr, size_t length) -{ - unsigned long i; - - check_bytes(addr); - for (i = 0; i < length; i++) - if (*(addr + i) != (char)i) - ksft_exit_fail_msg("Mismatch at %lu\n", i); - - ksft_test_result_pass("Read correct data\n"); -} - -int main(int argc, char **argv) -{ - void *addr; - size_t hugepage_size; - size_t length = LENGTH; - int flags = MAP_PRIVATE | MAP_ANONYMOUS | MAP_HUGETLB; - int shift = 0; - - hugepage_size = default_huge_page_size(); - /* munmap with fail if the length is not page aligned */ - if (hugepage_size > length) - length = hugepage_size; - - ksft_print_header(); - ksft_set_plan(1); - - if (argc > 1) - length = atol(argv[1]) << 20; - if (argc > 2) { - shift = atoi(argv[2]); - if (shift) - flags |= (shift & MAP_HUGE_MASK) << MAP_HUGE_SHIFT; - } - - if (shift) - ksft_print_msg("%u kB hugepages\n", 1 << (shift - 10)); - else - ksft_print_msg("Default size hugepages\n"); - ksft_print_msg("Mapping %lu Mbytes\n", (unsigned long)length >> 20); - - addr = mmap(NULL, length, PROTECTION, flags, -1, 0); - if (addr == MAP_FAILED) - ksft_exit_fail_msg("mmap: %s\n", strerror(errno)); - - ksft_print_msg("Returned address is %p\n", addr); - check_bytes(addr); - write_bytes(addr, length); - read_bytes(addr, length); - - /* munmap() length of MAP_HUGETLB memory must be hugepage aligned */ - if (munmap(addr, length)) - ksft_exit_fail_msg("munmap: %s\n", strerror(errno)); - - ksft_finished(); -} diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index e2dc9ac87bfc..61b450032af8 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -292,7 +292,6 @@ CATEGORY="hugetlb" run_test ./hugepage-shm echo "$shmmax" > /proc/sys/kernel/shmmax echo "$shmall" > /proc/sys/kernel/shmall -CATEGORY="hugetlb" run_test ./map_hugetlb CATEGORY="hugetlb" run_test ./hugepage-mremap CATEGORY="hugetlb" run_test ./hugepage-vmemmap CATEGORY="hugetlb" run_test ./hugetlb-madvise -- 2.53.0