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d=arm.com; s=foss; t=1788768914; bh=xSqHG/VfMLpainxQY/fzbMIjHfnHWNTmd9eRXxCLOUw=; h=From:To:Cc:Subject:Date:From; b=dkKeDEr1gAsm9E7R2VbPErY8w3VSzKhFwhdAYv+zqin/kthkMRZY0+ZiQBlFDq/Vu x6stEXTkBjiojGOKtiBnKqj1VORqU0cGYdb+pcwgRaOPn7oqfTdgrjvgM56ow1ujJX wNTfuAHOY0rNu0+GPcCw09L45AdnScxyh0tzlECM= From: Yeoreum Yun To: linux-mm@kvack.org, linux-kselftest@vger.kernel.org Cc: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, shuah@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, sarthak.sharma@arm.com, Yeoreum Yun Subject: [PATCH v2] kselftest: mm: remove HPAGE_SIZE and HPAGE_SHIFT macro Date: Mon, 7 Sep 2026 09:15:08 +0100 Message-ID: <20260907081509.924979-1-yeoreum.yun@arm.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: tk3cgmzcwr75xgb8w33a84u6uosm6d7b X-Rspamd-Queue-Id: 944BE40007 X-Rspamd-Server: rspam06 X-HE-Tag: 1788768915-873933 X-HE-Meta: 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 l1vbFrBC I/EO0Vtx2cin3qVPLgVBEcLOq6NPTWvvGgHNlNUF3A1Ixlo1hUdpQK6pk483Ij1fsfiG1fy28wm7qmMJuJOZZFXy2+8sgIBeZ8fNGEDXbkV/pOd2ag9upU8oh+IKd1K+MPUfOsR1YvsccoHdg3C78cYvxEzgeKXnW45/u29bukJdp2VemGeGby2tsrIfBpVLGnHaVl1N8FWv3tc89RL+yzRHcOpMiUjAs7OxDzEZM+9Nol6AhgUQdDyEYmN79Y3PeIjDr/xnqU9JZXpXhyqyuW6AMnLngULZhDtDCmuzosdK1/W+6/h0ITh0435dh+SYq66P+ Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: HPAGE_SIZE and HPAGE_SHIFT macro is written based on the 4KB PAGE_SIZE. When this macro is used in some test, test result would be strange in the system where PAGE_SIZE is more then 4KB. Here is the example with transhuge-stress test with 16KB PAGE_SIZE: transhuge-stress: allocate 61073 transhuge pages, using 122146 MiB virtual memory and 1908 MiB of ram 3.292 s/loop, 0.054 ms/page, 37106.002 MiB/s 2566 succeed, 58507 failed, 2566 different pages 0.591 s/loop, 0.010 ms/page, 206850.792 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231895.107 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231839.704 MiB/s 0 succeed, 61073 failed, 0 different pages 0.528 s/loop, 0.009 ms/page, 231544.782 MiB/s 0 succeed, 61073 failed, 0 different pages 0.528 s/loop, 0.009 ms/page, 231462.074 MiB/s 0 succeed, 61073 failed, 0 different pages 0.527 s/loop, 0.009 ms/page, 231770.300 MiB/s 0 succeed, 61073 failed, 0 different pages ... ok 1 Completed Remove the HPAGE_SIZE and HPAGE_SHIFT macros and introduce pmd_page_shift() helper to get the HPAGE_SHIFT properly. For HPAGE_SIZE, use pre-existing helper, read_pmd_pagesize(). Also, run the KSM_MERGE_TIME_HUGE_PAGES test with a size of 512 MiB, which is the least common multiple of the PMD sizes for 4 KiB, 16 KiB, and 64 KiB base pages. Since allocate_transhuge() allocates mappings in PMD-sized units, the test may fail with the previous size of 100 MiB, which is not a multiple of the PMD size when the base page size is 16 KiB or 64 KiB. After this patch, output of transhuge-stress: transhuge-stress: allocate 3817 transhuge pages, using 122146 MiB virtual memory and 119 MiB of ram 2.558 s/loop, 0.670 ms/page, 47755.759 MiB/s 2585 succeed, 1232 failed, 2585 different pages 2.640 s/loop, 0.692 ms/page, 46268.432 MiB/s 2585 succeed, 1232 failed, 2585 different pages 2.635 s/loop, 0.690 ms/page, 46360.298 MiB/s 2585 succeed, 1232 failed, 2585 different pages 2.782 s/loop, 0.729 ms/page, 43899.795 MiB/s 2616 succeed, 1201 failed, 2616 different pages 2.692 s/loop, 0.705 ms/page, 45380.876 MiB/s 2627 succeed, 1190 failed, 2627 different pages 2.612 s/loop, 0.684 ms/page, 46765.812 MiB/s 2628 succeed, 1189 failed, 2628 different pages 2.683 s/loop, 0.703 ms/page, 45520.990 MiB/s 2630 succeed, 1187 failed, 2630 different pages 2.727 s/loop, 0.714 ms/page, 44789.321 MiB/s 2631 succeed, 1186 failed, 2631 different pages ... ok 1 Completed Suggested-by: Lorenzo Stoakes (ARM) Signed-off-by: Yeoreum Yun --- Chnage in v2: - rename hpage_* to pmd_page_* - Link to v1: https://lore.kernel.org/all/20260902175611.1241118-1-yeoreum.yun@arm.com/#t --- tools/testing/selftests/mm/guard-regions.c | 11 ++++-- tools/testing/selftests/mm/ksm_tests.c | 16 +++++---- tools/testing/selftests/mm/run_vmtests.sh | 4 +-- tools/testing/selftests/mm/transhuge-stress.c | 25 +++++++------ tools/testing/selftests/mm/vm_util.c | 36 ++++++++++++++++--- tools/testing/selftests/mm/vm_util.h | 9 ++--- 6 files changed, 71 insertions(+), 30 deletions(-) diff --git a/tools/testing/selftests/mm/guard-regions.c b/tools/testing/selftests/mm/guard-regions.c index 5c8ec3ca75d7..e57cc7e39e41 100644 --- a/tools/testing/selftests/mm/guard-regions.c +++ b/tools/testing/selftests/mm/guard-regions.c @@ -2195,14 +2195,21 @@ TEST_F(guard_regions, pagemap_scan) TEST_F(guard_regions, collapse) { const unsigned long page_size = self->page_size; - const unsigned long size = 2 * HPAGE_SIZE; - const unsigned long num_pages = size / page_size; + const uint64_t hpage_size = read_pmd_pagesize(); + unsigned long size; + unsigned long num_pages; char *ptr; int i; if (!thp_available()) SKIP(return, "Transparent Hugepages not available\n"); + if (!hpage_size) + ksft_exit_fail_msg("reading hpage_size failed\n"); + + size = 2 * hpage_size; + num_pages = size / page_size; + /* Need file to be correct size for tests for non-anon. */ if (variant->backing != ANON_BACKED) ASSERT_EQ(ftruncate(self->fd, size), 0); diff --git a/tools/testing/selftests/mm/ksm_tests.c b/tools/testing/selftests/mm/ksm_tests.c index 5fd7792a0d47..ef27ce467b8c 100644 --- a/tools/testing/selftests/mm/ksm_tests.c +++ b/tools/testing/selftests/mm/ksm_tests.c @@ -521,19 +521,23 @@ static int ksm_merge_hugepages_time(int merge_type, int mapping, int prot, struct timespec start_time, end_time; unsigned long scan_time_ns; int pagemap_fd, n_normal_pages, n_huge_pages; + const uint64_t hpage_size = read_pmd_pagesize(); if (!thp_is_enabled()) { ksft_print_msg("Transparent Hugepages not available\n"); return KSFT_SKIP; } + if (!hpage_size) + ksft_exit_fail_msg("reading hpage_size failed\n"); + map_size *= MB; size_t len = map_size; - len -= len % HPAGE_SIZE; - map_ptr_orig = mmap(NULL, len + HPAGE_SIZE, PROT_READ | PROT_WRITE, + len -= len % hpage_size; + map_ptr_orig = mmap(NULL, len + hpage_size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE, -1, 0); - map_ptr = map_ptr_orig + HPAGE_SIZE - (uintptr_t)map_ptr_orig % HPAGE_SIZE; + map_ptr = map_ptr_orig + hpage_size - (uintptr_t)map_ptr_orig % hpage_size; if (map_ptr_orig == MAP_FAILED) err(2, "initial mmap"); @@ -547,7 +551,7 @@ static int ksm_merge_hugepages_time(int merge_type, int mapping, int prot, n_normal_pages = 0; n_huge_pages = 0; - for (void *p = map_ptr; p < map_ptr + len; p += HPAGE_SIZE) { + for (void *p = map_ptr; p < map_ptr + len; p += hpage_size) { if (allocate_transhuge(p, pagemap_fd) < 0) n_normal_pages++; else @@ -578,11 +582,11 @@ static int ksm_merge_hugepages_time(int merge_type, int mapping, int prot, ksft_print_msg("Average speed: %.3f MiB/s\n", (map_size / MB) / ((double)scan_time_ns / NSEC_PER_SEC)); - munmap(map_ptr_orig, len + HPAGE_SIZE); + munmap(map_ptr_orig, len + hpage_size); return KSFT_PASS; err_out: - munmap(map_ptr_orig, len + HPAGE_SIZE); + munmap(map_ptr_orig, len + hpage_size); return KSFT_FAIL; } diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index d09f9f6a384e..24aa1de27c25 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -360,8 +360,8 @@ fi CATEGORY="memfd_secret" run_test ./memfd_secret fi -# KSM KSM_MERGE_TIME_HUGE_PAGES test with size of 100 -CATEGORY="ksm" run_test ./ksm_tests -H -s 100 +# KSM KSM_MERGE_TIME_HUGE_PAGES test with size of 512 +CATEGORY="ksm" run_test ./ksm_tests -H -s 512 # KSM KSM_MERGE_TIME test with size of 100 CATEGORY="ksm" run_test ./ksm_tests -P -s 100 # KSM MADV_MERGEABLE test with 10 identical pages diff --git a/tools/testing/selftests/mm/transhuge-stress.c b/tools/testing/selftests/mm/transhuge-stress.c index 8eb0c5630e7e..9cd9790224db 100644 --- a/tools/testing/selftests/mm/transhuge-stress.c +++ b/tools/testing/selftests/mm/transhuge-stress.c @@ -35,12 +35,17 @@ int main(int argc, char **argv) size_t map_len; int pagemap_fd; int duration = 0; + const uint64_t hpage_size = read_pmd_pagesize(); + const uint64_t hpage_shift = pmd_page_shift(); ksft_print_header(); if (!thp_is_enabled()) ksft_exit_skip("Transparent Hugepages not available\n"); + if (!hpage_size || !hpage_shift) + ksft_exit_fail_msg("reading hpage_size failed\n"); + ram = sysconf(_SC_PHYS_PAGES); if (ram > SIZE_MAX / psize() / 4) ram = SIZE_MAX / 4; @@ -70,23 +75,23 @@ int main(int argc, char **argv) } warnx("allocate %zd transhuge pages, using %zd MiB virtual memory" - " and %zd MiB of ram", len >> HPAGE_SHIFT, len >> 20, - ram >> (20 + HPAGE_SHIFT - pshift() - 1)); + " and %zd MiB of ram", len >> hpage_shift, len >> 20, + ram >> (20 + hpage_shift - pshift() - 1)); pagemap_fd = open("/proc/self/pagemap", O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_msg("open pagemap\n"); - len -= len % HPAGE_SIZE; - ptr = mmap(NULL, len + HPAGE_SIZE, PROT_RW, mmap_flags, backing_fd, 0); + len -= len % hpage_size; + ptr = mmap(NULL, len + hpage_size, PROT_RW, mmap_flags, backing_fd, 0); if (ptr == MAP_FAILED) ksft_exit_fail_msg("initial mmap"); - ptr += HPAGE_SIZE - (uintptr_t)ptr % HPAGE_SIZE; + ptr += hpage_size - (uintptr_t)ptr % hpage_size; if (madvise(ptr, len, MADV_HUGEPAGE)) ksft_exit_fail_msg("MADV_HUGEPAGE"); - map_len = ram >> (HPAGE_SHIFT - 1); + map_len = ram >> (hpage_shift - 1); map = malloc(map_len); if (!map) ksft_exit_fail_msg("map malloc\n"); @@ -99,7 +104,7 @@ int main(int argc, char **argv) memset(map, 0, map_len); clock_gettime(CLOCK_MONOTONIC, &a); - for (p = ptr; p < ptr + len; p += HPAGE_SIZE) { + for (p = ptr; p < ptr + len; p += hpage_size) { int64_t pfn; pfn = allocate_transhuge(p, pagemap_fd); @@ -107,7 +112,7 @@ int main(int argc, char **argv) if (pfn < 0) { nr_failed++; } else { - size_t idx = pfn >> (HPAGE_SHIFT - pshift()); + size_t idx = pfn >> (hpage_shift - pshift()); nr_succeed++; if (idx >= map_len) { @@ -123,7 +128,7 @@ int main(int argc, char **argv) } /* split transhuge page, keep last page */ - if (madvise(p, HPAGE_SIZE - psize(), MADV_DONTNEED)) + if (madvise(p, hpage_size - psize(), MADV_DONTNEED)) ksft_exit_fail_msg("MADV_DONTNEED"); } clock_gettime(CLOCK_MONOTONIC, &b); @@ -131,7 +136,7 @@ int main(int argc, char **argv) ksft_print_msg("%.3f s/loop, %.3f ms/page, %10.3f MiB/s\t" "%4d succeed, %4d failed, %4d different pages\n", - s, s * 1000 / (len >> HPAGE_SHIFT), len / s / (1 << 20), + s, s * 1000 / (len >> hpage_shift), len / s / (1 << 20), nr_succeed, nr_failed, nr_pages); if (duration > 0 && b.tv_sec - start.tv_sec >= duration) { diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 4821a3563036..f75bf0bacd18 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -21,6 +21,8 @@ unsigned int __page_size; unsigned int __page_shift; +uint64_t __pmd_page_size; +uint64_t __pmd_page_shift; uint64_t pagemap_get_entry(int fd, char *start) { @@ -161,6 +163,9 @@ uint64_t read_pmd_pagesize(void) char buf[20]; ssize_t num_read; + if (__pmd_page_size) + return __pmd_page_size; + fd = open(PMD_SIZE_FILE_PATH, O_RDONLY); if (fd == -1) return 0; @@ -173,7 +178,25 @@ uint64_t read_pmd_pagesize(void) buf[num_read] = '\0'; close(fd); - return strtoul(buf, NULL, 10); + __pmd_page_size = strtoul(buf, NULL, 10); + + return __pmd_page_size; +} + +uint64_t pmd_page_shift(void) +{ + if (__pmd_page_shift) + return __pmd_page_shift; + + if (!__pmd_page_size) + __pmd_page_size = read_pmd_pagesize(); + + if (!__pmd_page_size) + return 0; + + __pmd_page_shift = (ffsl(__pmd_page_size) - 1); + + return __pmd_page_shift; } unsigned long rss_anon(void) @@ -452,14 +475,19 @@ bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpage_size int64_t allocate_transhuge(void *ptr, int pagemap_fd) { uint64_t ent[2]; + const uint64_t hpage_size = read_pmd_pagesize(); + const uint64_t hpage_shift = pmd_page_shift(); + + if (!hpage_size || !hpage_shift) + return -1; /* drop pmd */ - if (mmap(ptr, HPAGE_SIZE, PROT_READ | PROT_WRITE, + if (mmap(ptr, hpage_size, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_ANONYMOUS | MAP_NORESERVE | MAP_PRIVATE, -1, 0) != ptr) ksft_exit_fail_msg("mmap transhuge\n"); - if (madvise(ptr, HPAGE_SIZE, MADV_HUGEPAGE)) + if (madvise(ptr, hpage_size, MADV_HUGEPAGE)) ksft_exit_fail_msg("MADV_HUGEPAGE\n"); /* allocate transparent huge page */ @@ -471,7 +499,7 @@ int64_t allocate_transhuge(void *ptr, int pagemap_fd) if (PAGEMAP_PRESENT(ent[0]) && PAGEMAP_PRESENT(ent[1]) && PAGEMAP_PFN(ent[0]) + 1 == PAGEMAP_PFN(ent[1]) && - !(PAGEMAP_PFN(ent[0]) & ((1 << (HPAGE_SHIFT - pshift())) - 1))) + !(PAGEMAP_PFN(ent[0]) & ((1 << (hpage_shift - pshift())) - 1))) return PAGEMAP_PFN(ent[0]); return -1; diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests/mm/vm_util.h index 9a49af88702e..1d2608c1ad08 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -31,6 +31,8 @@ extern unsigned int __page_size; extern unsigned int __page_shift; +extern uint64_t __pmd_page_size; +extern uint64_t __pmd_page_shift; /* * Represents an open fd and PROCMAP_QUERY state for binary (via ioctl) @@ -89,6 +91,7 @@ unsigned long pagemap_get_pfn(int fd, char *start); void clear_softdirty(void); bool check_for_pattern(FILE *fp, const char *pattern, char *buf, size_t len); uint64_t read_pmd_pagesize(void); +uint64_t pmd_page_shift(void); unsigned long rss_anon(void); bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage_size); bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage_size); @@ -157,12 +160,6 @@ int ksm_stop(void); int get_hardware_corrupted_size(unsigned long *val); int unpoison_memory(unsigned long pfn); -/* - * On ppc64 this will only work with radix 2M hugepage size - */ -#define HPAGE_SHIFT 21 -#define HPAGE_SIZE (1 << HPAGE_SHIFT) - #define PAGEMAP_PRESENT(ent) (((ent) & (1ull << 63)) != 0) #define PAGEMAP_PFN(ent) ((ent) & ((1ull << 55) - 1)) -- LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}