From nobody Sat Sep 26 23:51:52 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id ADCEE3E1CE4; Fri, 28 Aug 2026 08:11:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787904710; cv=none; b=FlsjnlxsDn7wKZSbYM7/KP10f3G1IiSDCKdygd7QAHwSKy8SZvjpxhU2iwhjHv0ggF24RVPnvxsHWhtHn/FqFxf/cSrTt2+WWdkrNodB9XlxH2jTpY7ZeONZ5213PCT6FZXf0TTg+ss7XSnT9sY8M+BcqVxqyQCj94MqfWTX+lY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787904710; c=relaxed/simple; bh=0I8+Oez4/Fvep0PwEfY0VNcmLGz/KZXfSGanwudrUEc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=jvTBomnavGQnR2orAT2yalpZOodQ31inQ8pA5FCFxEVXGbGbg65056DuICbPHfpepDe88qPLJ7PyL7Eb2PuUER9zK1RJpDS/hN5mFIaz61UyiX461D6QiVVBrPs0Jgd8eBrHVWayOmB313IQxctQUudDt3IIKo9aprW1lpE2DuY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b=uzaOz1/o; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=arm.com header.i=@arm.com header.b="uzaOz1/o" Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2A3D31688; Fri, 28 Aug 2026 01:11:42 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 794223F85F; Fri, 28 Aug 2026 01:11:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1787904705; bh=0I8+Oez4/Fvep0PwEfY0VNcmLGz/KZXfSGanwudrUEc=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=uzaOz1/oJlW6bR6EV5BEwzUO3ZWDtOkiX8kQqTvtQIU+8Gstt90P/EfK0V5xpWkNj 68OSVH/YFW5zcfNWR7SNP8y2tmqKwNcLcLslb9UHvON4/PDR4Qmh3g6BKvZDU9lIay TSFu6UJYE3d/Bf8dt+2bNttsDZ8Ly2mXLvKiGusM= From: Yeoreum Yun Date: Fri, 28 Aug 2026 09:11:33 +0100 Subject: [PATCH v3 1/2] kselftest: mm: prevent random failure of huge page split for khugepaged Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260828-fix_split-v3-1-374022586a4b@arm.com> References: <20260828-fix_split-v3-0-374022586a4b@arm.com> In-Reply-To: <20260828-fix_split-v3-0-374022586a4b@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2554; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=0I8+Oez4/Fvep0PwEfY0VNcmLGz/KZXfSGanwudrUEc=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqkUK7V9mWLeZ9zL0R9lDWbj29vfP3HZbcACkU8 XLC7wYRzBeJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCapFCuwAKCRBt1cPRWsUx MzDVDACIL2ZyqeIY0AqiOfUb3ahEZz0Rfrp9OTdH2HaozEJu//mWMJfgISeHLcX1mIMhRKl1CGl YN1+8V4wMX3xvPj1HCQPgBmLNlyLnNm5+I8ELib45qcNWBhqxgzDiK9McBcHwkmhFZ6j+PqMvUY 60h8P9i7i5Am6skrXngCeQN5hpLtBGyJwRoVy3RJ5eloa8epQpkhri6oqRNaPzXgWhzkTrrswHp PhBjE83yLQQXvHWXx78YOkBQAHHRNdp/PdQ7NPdX3e1kb5QlDWKXlB78I8pokt5viPN6R/iurR6 U70GwNWPOz0yo0l+6xjpVCw5pS/xE6tsD2usTl3/WOPbdJssbinGjAT6AHq1Nv/dscvq+SHTJre CzFNwIc8ToSlZ1p8+lU3fOjsBUz2xRNKM4S2yIkLtNHJGhW7fYEMgnu9cPzX2u8IxR9kCVa9Xjb eHgKorOz6kpR+tC+1PpeU8FdefGOWSzKZlIyJMTw5FgBrZUKP8r4bqrvxl+KZ6GUtucnc= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 There're some random failure for split_huge_page_test when khugepaged collapses pages into pmd again which had split by the test. Prevent the khugepaged's collapses for split page by setting the mapped pmd-huge-page with MADV_NOHUGEPAGE before split. Reported-by: Kevin Brodsky Reviewed-by: Zi Yan Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/split_huge_page_test.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/test= ing/selftests/mm/split_huge_page_test.c index 86a603692826..c718269a291f 100644 --- a/tools/testing/selftests/mm/split_huge_page_test.c +++ b/tools/testing/selftests/mm/split_huge_page_test.c @@ -180,6 +180,10 @@ static void verify_rss_anon_split_huge_page_all_zeroes= (char *one_page, int nr_hp if (!rss_anon_before) ksft_exit_fail_msg("No RssAnon is allocated before split\n"); =20 + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(one_page, len, MADV_NOHUGEPAGE)) + ksft_print_msg("madvise(MADV_NOHUGEPAGE) failed\n"); + /* split all THPs */ write_debugfs(PID_FMT, getpid(), (uint64_t)one_page, (uint64_t)one_page + len, 0); @@ -227,6 +231,10 @@ static void split_pmd_thp_to_order(int order) if (!check_huge_anon(one_page, 4 * pmd_pagesize, 4, pmd_pagesize)) ksft_exit_fail_msg("No THP is allocated\n"); =20 + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(one_page, len, MADV_NOHUGEPAGE)) + ksft_print_msg("madvise(MADV_NOHUGEPAGE) failed\n"); + /* split all THPs */ write_debugfs(PID_FMT, getpid(), (uint64_t)one_page, (uint64_t)one_page + len, order); @@ -313,6 +321,10 @@ static void split_pte_mapped_thp(void) goto out; } =20 + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(thp_area, thp_area_size, MADV_NOHUGEPAGE)) + ksft_print_msg("madvise(MADV_NOHUGEPAGE) failed\n"); + /* Split all THPs through the remapped pages. */ write_debugfs(PID_FMT, getpid(), (uint64_t)page_area, (uint64_t)page_area + page_area_size, 0); @@ -542,6 +554,9 @@ static int create_pagecache_thp_and_fd(const char *test= file, size_t fd_size, ksft_test_result_skip("Pagecache folio split skipped\n"); return -2; } + /* Prevent khugepaged from collapsing the pages. */ + if (madvise(*addr, fd_size, MADV_NOHUGEPAGE)) + ksft_print_msg("madvise(MADV_NOHUGEPAGE) failed\n"); return 0; err_out_close: close(*fd); --=20 2.43.0 From nobody Sat Sep 26 23:51:52 2026 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 611523E2740; Fri, 28 Aug 2026 08:11:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787904714; cv=none; b=DQoeOr7n4p8hePSM2voguGl/YnvwLRrqirXVKQAwwXSEvn4qriNyRJmg0lzwuJS/Nc/mqybOERTLJ/6hQOlxbkrIxRrHoWb+u7xkCfQGk/AssRA9scau3+Ph4iPoW6Ww8+yriAjO7+Vf8d8DZWPjFmuV+9qSJb9MyiBJqge1ZlI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787904714; c=relaxed/simple; bh=SSZ/dke2eJqfQi3JNnjQcCUtyxBe9Q8ye26urwOBivc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=BHEGUm88fwkqKOUtX2xIgWTGiwcXCCqhr0qgn9w65/0rXwEQ3B1wuAljmAvHwJQBfCjbfvnOVjjrxcLHZjb2TpJR+kG8ymZYsMvIUAMD68EMmVujti0t9pf9lcq/h0BA0Xw4X3+9aiD6LCQeupCel/rfXfk9G+7M+mN/exKpJX8= ARC-Authentication-Results: i=1; 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h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=QKNXE3rSlEJLWjgVn9jXYmfrGtwqgbLV9BDcA38DBoUbf4O/mWaAWUCxX8Aj0SdGc DXNSLE0tQ0U77BshnvGgRqhXQnqABJeBkhul4ouBkDyz3L66aZOqlKt2/YNESj1QwZ qED/p6Lk1GR+nwmJ01dMPLopS5m02kWBqlcwBiHM= From: Yeoreum Yun Date: Fri, 28 Aug 2026 09:11:34 +0100 Subject: [PATCH v3 2/2] kselftest: mm: replace usage of /proc/self/smaps for check_huge_xxx() helper Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20260828-fix_split-v3-2-374022586a4b@arm.com> References: <20260828-fix_split-v3-0-374022586a4b@arm.com> In-Reply-To: <20260828-fix_split-v3-0-374022586a4b@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=7740; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=SSZ/dke2eJqfQi3JNnjQcCUtyxBe9Q8ye26urwOBivc=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqkUK8H67Y8gy30FCcQx8m4fmdEselt1VQNJGTO oZ2eswZCdCJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCapFCvAAKCRBt1cPRWsUx Mz2zDACjGmQpaW0+V1pmvHkE8DRj8W2cZg83EQgDjxm+EJXc+uB0as+VUb2fzEOpNYWVUymB787 jgOkNW72mFoEBfc670zw/yXmdpXZ9HHnQyrcUyKNPqA04jYiFeBk5yBUzVTRzfAwcxhhQfsq1dK Gy0WLQ2RRR5S/xHBjGAwg2tnA/D3k41ZWXntMxUdOybOFC4ytG9HmZyzI+CxhZXbkP+QHmI/P6l AF2ef7WUuLGtNSY9dVjR4I6te/pHue0++BPWlyG8vf1tR/cEsTUS26ZP3isl2nM8yHROzWMVREk zPH2RzxL+O0x8N1miL9R5LehjLvWBRHqV3Fd7LpT+CDH8iuOzR7YEqkKCop+3ZP0CfTyEwvj/I4 R1P0g6yPXUrRvJX3G9mWzdhn9PQEfLpkqyPSewBk0Li+W/mcpEhhs/GvzrM6qaD7dCYQGJcrOg7 f6cZZmcDZTHi+dRODhfBPgpxverQQ8BOP3AIcw5CYX34NQvXUbRoC5/6ZQIdRXGg/adRk= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 Since glibc commit 321e1fc73f (=E2=80=9Cmalloc: Enable 2MB THP by default o= n AArch64=E2=80=9D), glibc may call madvise(MADV_HUGEPAGE) for sufficiently large allocations made by memalign(). The underlying VMA may start at a different address from the aligned address returned by memalign(). Furthermore, a subsequent madvise(MADV_HUGEPAGE) call does not split the VMA because the flag is already set. This causes split_huge_page_test to fail because the check_huge_xxx() helpers incorrectly require the address returned by memalign() to match the VMA start address reported in /proc/self/smaps. Fix this by using /proc/self/pagemap and /proc/kpageflags instead of /proc/self/smaps to detect huge pages. Reported-by: David Hildenbrand (Arm) Suggested-by: Zi Yan Signed-off-by: Yeoreum Yun Acked-by: Lorenzo Stoakes (ARM) Reviewed-by: Baolin Wang Reviewed-by: Zi Yan Tested-by: Baolin Wang --- tools/testing/selftests/mm/vm_util.c | 145 ++++++++++++++++++++++---------= ---- tools/testing/selftests/mm/vm_util.h | 1 + 2 files changed, 92 insertions(+), 54 deletions(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests= /mm/vm_util.c index 4821a3563036..083b72d92b14 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -351,31 +351,13 @@ char *__get_smap_entry(void *addr, const char *patter= n, char *buf, size_t len) return entry; } =20 -static bool __check_pmd_huge(void *addr, char *pattern, int nr_hpages, - uint64_t hpage_size) -{ - char buffer[MAX_LINE_LENGTH]; - uint64_t thp =3D -1; - char *entry; - - entry =3D __get_smap_entry(addr, pattern, buffer, sizeof(buffer)); - if (!entry) - goto err_out; - - if (sscanf(entry, "%9" SCNu64 " kB", &thp) !=3D 1) - ksft_exit_fail_msg("Reading smap error\n"); - -err_out: - return thp =3D=3D (nr_hpages * (hpage_size >> 10)); -} - -static bool check_large_folios(void *addr, size_t len, int nr_hpages, - uint64_t hpage_size) +static bool check_large_folios(int pagemap_fd, int kpageflags_fd, + void *addr, size_t len, int nr_hpages, + uint64_t hpage_size) { int order =3D 0, pagesize =3D getpagesize(); unsigned int nr_pages =3D hpage_size / pagesize; int orders[MAX_NR_ORDERS], status; - int pagemap_fd, kpageflags_fd; bool ret =3D false; =20 if (!nr_pages) @@ -386,15 +368,6 @@ static bool check_large_folios(void *addr, size_t len,= int nr_hpages, ksft_exit_fail_msg("invalid order\n"); =20 memset(orders, 0, sizeof(int) * MAX_NR_ORDERS); - pagemap_fd =3D open(PAGEMAP_PATH, O_RDONLY); - if (pagemap_fd =3D=3D -1) - ksft_exit_fail_msg("read pagemap fail\n"); - - kpageflags_fd =3D open(KPAGEFLAGS_PATH, O_RDONLY); - if (kpageflags_fd =3D=3D -1) { - close(pagemap_fd); - ksft_exit_fail_msg("read kpageflags fail\n"); - } =20 status =3D gather_folio_orders(addr, len, pagemap_fd, kpageflags_fd, orders, MAX_NR_ORDERS); @@ -405,48 +378,112 @@ static bool check_large_folios(void *addr, size_t le= n, int nr_hpages, ret =3D true; =20 out: - close(pagemap_fd); - close(kpageflags_fd); return ret; } =20 -bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) -{ - uint64_t pmd_pagesize =3D read_pmd_pagesize(); - - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); +enum check_huge_type { + CHECK_HUGE_ANON, + CHECK_HUGE_FILE, + CHECK_HUGE_SHMEM, +}; =20 - if (hpage_size =3D=3D pmd_pagesize) - return __check_pmd_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); +static bool check_huge_type(uint64_t categories, uint64_t kpageflags, + enum check_huge_type type) +{ + bool file =3D categories & PAGE_IS_FILE; + bool swapbacked =3D kpageflags & KPF_SWAPBACKED; + + switch (type) { + case CHECK_HUGE_ANON: + return !file; + case CHECK_HUGE_FILE: + return file && !swapbacked; + case CHECK_HUGE_SHMEM: + return file & swapbacked; + } =20 - return check_large_folios(addr, len, nr_hpages, hpage_size); + return false; } =20 -bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) +static bool __check_huge(void *addr, size_t len, int nr_hpages, + uint64_t hpage_size, enum check_huge_type type) { - uint64_t pmd_pagesize =3D read_pmd_pagesize(); + bool ret =3D false; + int pagemap_fd, kpageflags_fd; + int nr_pmd_mappings =3D 0; + uint64_t pmd_pagesize, scan_mapping_size; + uint64_t categories, kpf; + unsigned long pfn; + bool check_pmd_mapping, allow_nonpresent; + char *start =3D addr; + char *end =3D start + len; =20 + pmd_pagesize =3D read_pmd_pagesize(); if (!pmd_pagesize) ksft_exit_fail_msg("reading PMD pagesize failed\n"); =20 - if (hpage_size =3D=3D pmd_pagesize) - return __check_pmd_huge(addr, "FilePmdMapped:", nr_hpages, hpage_size); + check_pmd_mapping =3D (hpage_size =3D=3D pmd_pagesize); + scan_mapping_size =3D (nr_hpages > 0) ? hpage_size : psize(); + /* Some mTHP tests check a partially populated PMD-sized range. */ + allow_nonpresent =3D (uint64_t)nr_hpages * hpage_size < len; =20 - return check_large_folios(addr, len, nr_hpages, hpage_size); + pagemap_fd =3D open(PAGEMAP_PATH, O_RDONLY); + if (pagemap_fd < 0) + ksft_exit_fail_msg("open pagemap fail\n"); + + kpageflags_fd =3D open(KPAGEFLAGS_PATH, O_RDONLY); + if (kpageflags_fd < 0) { + close(pagemap_fd); + ksft_exit_fail_msg("open kpageflags fail\n"); + } + + if (!check_pmd_mapping && + !check_large_folios(pagemap_fd, kpageflags_fd, + addr, len, nr_hpages, hpage_size)) + goto out; + + for (; start < end; start +=3D scan_mapping_size) { + categories =3D pagemap_scan_get_categories(pagemap_fd, start); + pfn =3D pagemap_get_pfn(pagemap_fd, start); + if (pfn =3D=3D -1UL) { + if (!allow_nonpresent) + goto out; + else + continue; + } + if (pageflags_get(pfn, kpageflags_fd, &kpf)) + ksft_exit_fail_msg("read kpageflags: %s\n", strerror(errno)); + if (check_pmd_mapping && (categories & PAGE_IS_HUGE)) + nr_pmd_mappings++; + if (kpf & KPF_COMPOUND_TAIL) + continue; + if (!check_huge_type(categories, kpf, type)) + goto out; + } +=09 + if (check_pmd_mapping && (nr_pmd_mappings !=3D nr_hpages)) + goto out; + ret =3D true; + +out: + close(pagemap_fd); + close(kpageflags_fd); + return ret; } =20 -bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpag= e_size) +bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) { - uint64_t pmd_pagesize =3D read_pmd_pagesize(); - - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); + return __check_huge(addr, len, nr_hpages, hpage_size, CHECK_HUGE_ANON); +} =20 - if (hpage_size =3D=3D pmd_pagesize) - return __check_pmd_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size); +bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage= _size) +{ + return __check_huge(addr, len, nr_hpages, hpage_size, CHECK_HUGE_FILE); +} =20 - return check_large_folios(addr, len, nr_hpages, hpage_size); +bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpag= e_size) +{ + return __check_huge(addr, len, nr_hpages, hpage_size, CHECK_HUGE_SHMEM); } =20 int64_t allocate_transhuge(void *ptr, int pagemap_fd) diff --git a/tools/testing/selftests/mm/vm_util.h b/tools/testing/selftests= /mm/vm_util.h index 9a49af88702e..f19bd17817e5 100644 --- a/tools/testing/selftests/mm/vm_util.h +++ b/tools/testing/selftests/mm/vm_util.h @@ -18,6 +18,7 @@ #define PM_SWAP BIT_ULL(62) #define PM_PRESENT BIT_ULL(63) =20 +#define KPF_SWAPBACKED BIT_ULL(14) #define KPF_COMPOUND_HEAD BIT_ULL(15) #define KPF_COMPOUND_TAIL BIT_ULL(16) #define KPF_HWPOISON BIT_ULL(19) --=20 2.43.0