From mboxrd@z Thu Jan 1 00:00:00 1970 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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8C5B6CD484C for ; Mon, 11 May 2026 16:31:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D4BC96B0102; Mon, 11 May 2026 12:31:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CAE0A6B0103; Mon, 11 May 2026 12:31:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BC45D6B0104; Mon, 11 May 2026 12:31:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id B095F6B0102 for ; Mon, 11 May 2026 12:31:42 -0400 (EDT) Received: from smtpin15.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 5C54C40217 for ; Mon, 11 May 2026 16:31:42 +0000 (UTC) X-FDA: 84755680044.15.274D9C2 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf21.hostedemail.com (Postfix) with ESMTP id C0A311C0007 for ; Mon, 11 May 2026 16:31:40 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=PjYNyoLN; spf=pass (imf21.hostedemail.com: domain of rppt@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1778517100; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=SCu9wuZW707fIn++ZYRdiIXgbEKt5aFCJdlEHSRBAvA=; b=TIoOiTjIfvnK6OA6wIgv9LQQR8vQLISn6qBEk3K5JIvKrCdSjTx+1OQnPyxrH3bzs+td5R mv4ElWTnDmtbVavp93TPWv3uUG3z9ZEcT94zU/qRFj3RquOe7A1c82Vpcx37moGUPxJffs YTwCKk5KJfXa6CinhGv5XbtQ//6eMa0= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=PjYNyoLN; spf=pass (imf21.hostedemail.com: domain of rppt@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1778517100; a=rsa-sha256; cv=none; b=wASV7myifrXiZSHLJFwOtuGm9HuIcWTTGbapEAAb1bCUZCcqG45GduAkkWZ2HrvUJ34CWM JjbqCkk0AWoDo6bbA2u8DMN2JEYS1NNL36TfWgBMkV/BgjVibA8KU1EwrYGu0XD/lX7eVS atQooqT1kfKdK+c3Thq73HxtlwpJb8I= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 4F6E560121; Mon, 11 May 2026 16:31:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 037D9C2BCC9; Mon, 11 May 2026 16:31:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1778517100; bh=pXMsXnfWgM/h8m4iqvonRVvJ3etoKtdEnVR62w9G5c0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PjYNyoLND5Zg6UaBYPSQw5v0x/Vy47GLwb8zx8AoTqLfjseDimzGA4KpTXjS3f2aR eqQQkOAi4IRYToUe/txG4NTBGHFBHnPUfw+YpCedkz3v9DiTnWoqQjGxKxV78vGz/z toWzuQMu11kE2aQIMJlCN2XiathLHZT+WzDbWvVlI8rG8MhGQG+6pR0GG0RJj8Gybm SPavGf8DuhNvqj8mJCE3U6LlWmaOheL6Wfj8FZaMp468PEPt7j82qlI25sxLwX/4qh pg/HyWd+zlqO34m5UrZTg6tHA1s/SS+QLBUDoTGfF2jQWKHHLziIh7laJJzVkad1cn AbEN6ZLFklXnw== From: Mike Rapoport To: Andrew Morton , David Hildenbrand Cc: Baolin Wang , Barry Song , Dev Jain , Donet Tom , Jason Gunthorpe , John Hubbard , "Liam R. Howlett" , Lance Yang , Li Wang , Leon Romanovsky , Lorenzo Stoakes , Luiz Capitulino , Mark Brown , Michal Hocko , Mike Rapoport , Nico Pache , Peter Xu , Ryan Roberts , Sarthak Sharma , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , Zi Yan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v4 26/55] selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages Date: Mon, 11 May 2026 19:28:10 +0300 Message-ID: <20260511162840.375890-27-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260511162840.375890-1-rppt@kernel.org> References: <20260511162840.375890-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: C0A311C0007 X-Stat-Signature: qrpy3gmtm6ghrazgwac7thh5wcbs414g X-HE-Tag: 1778517100-247449 X-HE-Meta: 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 q3unTo5e Mfu3f20quJJvXoAYv0AeV30Cmmn/11+eBZXZSOuhgTa4Jw3GaJmmda1B3sqHHtruvnJUXqqSwKYpeXD56Mk4/4hCv4Q7jHVr90Qrcv3rT1T8LhsMJB1zgkwtd9qClkUKmGaVX2/ZchLi8LhLxYk/tn0NCTC9kxR3almpv/I1/aSk7EKQi81C6wh2P5tR6dum7NphFcXV4ViMoLmESlz0b1jTtLGnR1uOjLDFs35g5QfN+2Twkk4HsxJEndt8wkKBrC2AztnZGxw6SRgHKmqzsrSvssGQS31M6re69x5OD8ObZqMw2KKO/D+yNqg3/tXLj5LWPWiqvd+vSQa6pwh2STFcnkxEmpKXQUYG/NT2bkDaeJ5Y= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: "Mike Rapoport (Microsoft)" Add APIs that allow reading and writing of /sys/kernel/mm/hugepages/hugepages-NkB/nr_hugepages to detect and change the amount of HugeTLB pages of different sizes. Reviewed-by: Luiz Capitulino Tested-by: Luiz Capitulino Tested-by: Sarthak Sharma Signed-off-by: Mike Rapoport (Microsoft) --- .../testing/selftests/mm/hugepage_settings.c | 25 +++++++++++++++++++ .../testing/selftests/mm/hugepage_settings.h | 23 +++++++++++++++++ 2 files changed, 48 insertions(+) diff --git a/tools/testing/selftests/mm/hugepage_settings.c b/tools/testing/selftests/mm/hugepage_settings.c index fa635667aabb..99402cfccb6d 100644 --- a/tools/testing/selftests/mm/hugepage_settings.c +++ b/tools/testing/selftests/mm/hugepage_settings.c @@ -463,3 +463,28 @@ unsigned long get_free_hugepages(void) fclose(f); return fhp; } + +static void hugetlb_sysfs_path(char *buf, size_t buflen, + unsigned long size, const char *attr) +{ + snprintf(buf, buflen, "/sys/kernel/mm/hugepages/hugepages-%lukB/%s", + size / 1024, attr); +} + +unsigned long hugetlb_nr_pages(unsigned long size) +{ + char path[PATH_MAX]; + + hugetlb_sysfs_path(path, sizeof(path), size, "nr_hugepages"); + + return read_num(path); +} + +void hugetlb_set_nr_pages(unsigned long size, unsigned long nr) +{ + char path[PATH_MAX]; + + hugetlb_sysfs_path(path, sizeof(path), size, "nr_hugepages"); + + write_num(path, nr); +} diff --git a/tools/testing/selftests/mm/hugepage_settings.h b/tools/testing/selftests/mm/hugepage_settings.h index f49bd7fba512..e66302926377 100644 --- a/tools/testing/selftests/mm/hugepage_settings.h +++ b/tools/testing/selftests/mm/hugepage_settings.h @@ -94,4 +94,27 @@ int detect_hugetlb_page_sizes(unsigned long sizes[], int max); unsigned long default_huge_page_size(void); unsigned long get_free_hugepages(void); +unsigned long hugetlb_nr_pages(unsigned long size); +void hugetlb_set_nr_pages(unsigned long size, unsigned long nr); + +static inline unsigned long hugetlb_nr_default_pages(void) +{ + unsigned long size = default_huge_page_size(); + + if (!size) + return 0; + + return hugetlb_nr_pages(size); +} + +static inline void hugetlb_set_nr_default_pages(unsigned long nr) +{ + unsigned long size = default_huge_page_size(); + + if (!size) + return; + + hugetlb_set_nr_pages(size, nr); +} + #endif /* __HUGEPAGE_SETTINGS_H__ */ -- 2.53.0