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 B85B4FF886D for ; Tue, 28 Apr 2026 20:45:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2C8D36B00C4; Tue, 28 Apr 2026 16:45:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 29F156B00C6; Tue, 28 Apr 2026 16:45:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 1B52B6B00C7; Tue, 28 Apr 2026 16:45:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 0B30A6B00C4 for ; Tue, 28 Apr 2026 16:45:39 -0400 (EDT) Received: from smtpin24.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id C7B62120237 for ; Tue, 28 Apr 2026 20:45:38 +0000 (UTC) X-FDA: 84709145556.24.98B0347 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf05.hostedemail.com (Postfix) with ESMTP id 24CBA100002 for ; Tue, 28 Apr 2026 20:45:36 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=q2Yk6W1T; spf=pass (imf05.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 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=1777409137; 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=0VUcD001jzpiQXtrj7RFlcVDxuMqwRaPydFSJTdD1Bc=; b=kML8NeEd6WMAkgfjwzzZOt5AOpE4KtPetEvybddOUHeob+e9LOJKeEeC/ccv61xnl7eIsh xGgD6H3oSz/pTWH6sPrSCMaalI3rBjx3JsAHlFaYHdBmJz3HjL97u0pNZEVGIe5Ca2CrsO t0Pxb89B2wkPnFs3s/yvCPe5jDrFoqQ= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=q2Yk6W1T; spf=pass (imf05.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 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=1777409137; a=rsa-sha256; cv=none; b=gDDA3KE3/w6DGGKuEe+eUw/czxfZj8PjjieGLu4qhUD04RcC0rLW+vbjj950IMDTyqyCtD +2dh4AQKvneBPzsc69XlPuJyIr/dJht0OU2gkFQp5ZAPruqz/Ty+gCv+NA5N4ILOjUquPl V0I4HNcpZC9Py00ZUatgZ7FDOHfjj30= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 2B45C40A78; Tue, 28 Apr 2026 20:45:36 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id F1F61C4AF09; Tue, 28 Apr 2026 20:45:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777409136; bh=6tmwrYqrWIbuMw5GfhGQhH/MUUQ+JMHsDHml8bmka3I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=q2Yk6W1Tup/ZKaBNBSStPROW97IQHtgQWyBmaOm5+R37bRMYIQJ7GHA3ktQ/z/LiK nX2UGEfOWlweXBNBx4SnO3CWQq7yqnB1GEu+Ma0CC0m1wGge9NjWH2qT4yfXA/CzHn h0LJFmfeHrO2kO2Myyjdk6ztJ0aLOVm8sHGMovafiXVeX3WRJ3wMRIzt1MnwL+0Cly VFUY/m2GrrJ7HrS6dIz/VAagWeXXOh564Yb4BsQI/270BYsWtReYEjbWt0kQSHngru li09iiog7F9s8PKsg7EzlxiA8ZHCFFieMcwxuTE9l86B1QSECVusLnkoxALJbXFlTZ 137gvmJ8Y35JA== 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 , 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 v3 25/54] selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages Date: Tue, 28 Apr 2026 23:42:11 +0300 Message-ID: <20260428204240.1924129-26-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260428204240.1924129-1-rppt@kernel.org> References: <20260428204240.1924129-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 24CBA100002 X-Stat-Signature: foztm6f999d51q6mi5nm5jdn19mbmz85 X-HE-Tag: 1777409136-115804 X-HE-Meta: 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 j/I78TzX CLdV+X1N/OsZM4Zxi0HYObRAUsWk2VsMx5JwEQsuF7mtzdnsSUqS/KCiOG47uAglKWkZAPwuHV8b/fBZe73VgAEq/3lDZfV3/iEnKvO/dSDPoLvy2WfImZW8W1fRHFIpCozscJAtrMV+Aw7iQ/m/g3Vh4P7quXTfPjnqXhdyftSplGRqVgFV7BABLUcaCtqa8spNG4/FpH+dXdiLTKy0jVx0FRzLbo9xCwsXFcIkUrKE2punDlUThR+uT/x31Bj9xGhcAbIV/PzeZZRkL9YC1Sk9qMNwDXjPxLVLg 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. 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 8f563315b1fc..5961229b9931 100644 --- a/tools/testing/selftests/mm/hugepage_settings.c +++ b/tools/testing/selftests/mm/hugepage_settings.c @@ -464,3 +464,28 @@ 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 9357d07e6c1b..d6f41a45e8ee 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 /* __THP_SETTINGS_H__ */ -- 2.53.0