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Tue, 18 Mar 2025 10:43:54 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , Shuah Khan , Peter Xu Cc: Ryan Roberts , linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [PATCH v1 1/3] selftests/mm: Fix half_ufd_size_MB calculation Date: Tue, 18 Mar 2025 17:43:39 +0000 Message-ID: <20250318174343.243631-1-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 9A1EF100011 X-Rspamd-Server: rspam05 X-Stat-Signature: hx8wd9ygnk67oyszfxpwxpekhpd1t1ue X-HE-Tag: 1742319836-39931 X-HE-Meta: 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 lj/FEDuN nsUmmh3qIl3+ItBjzB8hodUlr9ViRGAKJHV9bPiGssTTs8V4jbVfb5A4cwNehq2Vc92Ufw4nBfy55fMSMJ+Sle33dQ43llXhCwAiiYPsDiIkM7GLxTgVSuFh/xe+0nIT6ivoptlAz36+UzjzGIXwfvmQuxTv0raw+eatzUaBt4cV/Y7+b1as4M4ADcTxB4vqyVbxsmkkr3xbX/7s= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: $half_ufd_size_MB is supposed to be half of the available hugetlb memory expressed in MB. But previously it was calculated in pages since $freepgs is the number of free pages. When huge pages are 2M it doesn't make a whole lot of difference; the number of pages that get used is just halved. But on arm64 with 16K or 64K base pages, the PMD size (and default hugetlb size) is 32M and 512M respectively. So in this case we end up passing a number of MB that is smaller than a single hugetlb page and the test raises an error. Fixes: 2e47a445d7b3 ("selftests/mm: run_vmtests.sh: fix hugetlb mem size calculation") Signed-off-by: Ryan Roberts --- tools/testing/selftests/mm/run_vmtests.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) -- 2.43.0 diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index da7e26668103..14fa9d40d574 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -304,7 +304,7 @@ uffd_stress_bin=./uffd-stress CATEGORY="userfaultfd" run_test ${uffd_stress_bin} anon 20 16 # Hugetlb tests require source and destination huge pages. Pass in half # the size of the free pages we have, which is used for *each*. -half_ufd_size_MB=$((freepgs / 2)) +half_ufd_size_MB=$(((freepgs * hpgsize_KB / 2) / 1024)) CATEGORY="userfaultfd" run_test ${uffd_stress_bin} hugetlb "$half_ufd_size_MB" 32 CATEGORY="userfaultfd" run_test ${uffd_stress_bin} hugetlb-private "$half_ufd_size_MB" 32 CATEGORY="userfaultfd" run_test ${uffd_stress_bin} shmem 20 16 From patchwork Tue Mar 18 17:43:40 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 14021375 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id C35BCC282EC for ; Tue, 18 Mar 2025 17:43:59 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 070F0280006; Tue, 18 Mar 2025 13:43:58 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 01D01280002; 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Tue, 18 Mar 2025 10:44:05 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id DAC283F673; Tue, 18 Mar 2025 10:43:55 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , Shuah Khan , Peter Xu Cc: Ryan Roberts , linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [PATCH v1 2/3] selftests/mm: uffd-unit-tests support for hugepages > 2M Date: Tue, 18 Mar 2025 17:43:40 +0000 Message-ID: <20250318174343.243631-2-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250318174343.243631-1-ryan.roberts@arm.com> References: <20250318174343.243631-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-Stat-Signature: 1rweydsxmd55ywtnrcbumapt9sao5skx X-Rspamd-Queue-Id: 54B8840011 X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1742319837-557169 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: uffd-unit-tests uses a memory area with a fixed 32M size. Then it calculates the number of pages by dividing by page_size, which itself is either the base page size or the PMD huge page size depending on the test config. For the latter, we end up with nr_pages=1 for arm64 16K base pages, and nr_pages=0 for 64K base pages. This doesn't end well. So let's make the 32M size a floor and also ensure that we have at least 2 pages given the PMD size. With this change, the tests pass on arm64 64K base page size configuration. Signed-off-by: Ryan Roberts Acked-by: Peter Xu Acked-by: Rafael Aquini --- tools/testing/selftests/mm/uffd-unit-tests.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c index 74c8bc02b506..6973e57b227a 100644 --- a/tools/testing/selftests/mm/uffd-unit-tests.c +++ b/tools/testing/selftests/mm/uffd-unit-tests.c @@ -26,6 +26,8 @@ #define ALIGN_UP(x, align_to) \ ((__typeof__(x))((((unsigned long)(x)) + ((align_to)-1)) & ~((align_to)-1))) +#define MAX(a, b) (((a) > (b)) ? (a) : (b)) + struct mem_type { const char *name; unsigned int mem_flag; @@ -196,7 +198,8 @@ uffd_setup_environment(uffd_test_args_t *args, uffd_test_case_t *test, else page_size = psize(); - nr_pages = UFFD_TEST_MEM_SIZE / page_size; + /* Ensure we have at least 2 pages */ + nr_pages = MAX(UFFD_TEST_MEM_SIZE, page_size * 2) / page_size; /* TODO: remove this global var.. it's so ugly */ nr_cpus = 1; From patchwork Tue Mar 18 17:43:41 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ryan Roberts X-Patchwork-Id: 14021377 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26830C28B2F for ; Tue, 18 Mar 2025 17:44:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6AFEB280007; Tue, 18 Mar 2025 13:43:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 67DC7280005; 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Tue, 18 Mar 2025 10:44:06 -0700 (PDT) Received: from e125769.cambridge.arm.com (e125769.cambridge.arm.com [10.1.196.27]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id E8B433F673; Tue, 18 Mar 2025 10:43:56 -0700 (PDT) From: Ryan Roberts To: Andrew Morton , Shuah Khan , Peter Xu Cc: Ryan Roberts , linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: [PATCH v1 3/3] selftests/mm: Speed up split_huge_page_test Date: Tue, 18 Mar 2025 17:43:41 +0000 Message-ID: <20250318174343.243631-3-ryan.roberts@arm.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250318174343.243631-1-ryan.roberts@arm.com> References: <20250318174343.243631-1-ryan.roberts@arm.com> MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: BC813C000D X-Rspamd-Server: rspam05 X-Stat-Signature: sac4ndyzix9ebuie6m953swre3u95eop X-HE-Tag: 1742319838-3632 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: create_pagecache_thp_and_fd() was previously writing a file sized at twice the PMD size by making a per-byte write syscall. This was quite slow when the PMD size is 4M, but completely intolerable for 32M (PMD size for arm64's 16K page size), and 512M (PMD size for arm64's 64K page size). The byte pattern has a 256 byte period, so let's create a 1K buffer and fill it with exactly 4 periods. Then we can write the buffer as many times as is required to fill the file. This makes things much more tolerable. The test now passes for 16K page size. It still fails for 64K page size because MAX_PAGECACHE_ORDER is too small for 512M folio size (I think). Signed-off-by: Ryan Roberts Acked-by: Peter Xu Acked-by: Rafael Aquini --- tools/testing/selftests/mm/split_huge_page_test.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/mm/split_huge_page_test.c b/tools/testing/selftests/mm/split_huge_page_test.c index 3f353f3d070f..499333d75fff 100644 --- a/tools/testing/selftests/mm/split_huge_page_test.c +++ b/tools/testing/selftests/mm/split_huge_page_test.c @@ -5,6 +5,7 @@ */ #define _GNU_SOURCE +#include #include #include #include @@ -361,6 +362,7 @@ int create_pagecache_thp_and_fd(const char *testfile, size_t fd_size, int *fd, { size_t i; int dummy = 0; + unsigned char buf[1024]; srand(time(NULL)); @@ -368,11 +370,12 @@ int create_pagecache_thp_and_fd(const char *testfile, size_t fd_size, int *fd, if (*fd == -1) ksft_exit_fail_msg("Failed to create a file at %s\n", testfile); - for (i = 0; i < fd_size; i++) { - unsigned char byte = (unsigned char)i; + assert(fd_size % sizeof(buf) == 0); + for (i = 0; i < sizeof(buf); i++) + buf[i] = (unsigned char)i; + for (i = 0; i < fd_size; i += sizeof(buf)) + write(*fd, buf, sizeof(buf)); - write(*fd, &byte, sizeof(byte)); - } close(*fd); sync(); *fd = open("/proc/sys/vm/drop_caches", O_WRONLY);