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 CCFD9F99C79 for ; Sat, 18 Apr 2026 10:58:19 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 438236B025E; Sat, 18 Apr 2026 06:58:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3C1E16B0260; Sat, 18 Apr 2026 06:58:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 289FC6B0261; Sat, 18 Apr 2026 06:58:19 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id 133366B025E for ; Sat, 18 Apr 2026 06:58:19 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id D97EF1B7EDD for ; Sat, 18 Apr 2026 10:58:18 +0000 (UTC) X-FDA: 84671377476.20.13BA7D2 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf09.hostedemail.com (Postfix) with ESMTP id 33E19140006 for ; Sat, 18 Apr 2026 10:58:17 +0000 (UTC) Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=IGeA0rJG; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf09.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=rppt@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1776509897; a=rsa-sha256; cv=none; b=i80jjy2m5oAFrMWiXoXousgIEx3QrgK7hDg2FEzQ7PKZ2RrS42d4LDBS7nzv3PWvFZEK6y x6KOZ2/El+AuBD7JeUTYoa4xUmtw/q/ZeU1Pyn/Qi7DF2D3X0/T18ugiOrRW/qcZ1I/eSb flwbBPbodtLPxOxB+wqoTClpePUK83g= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=IGeA0rJG; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf09.hostedemail.com: domain of rppt@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=rppt@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1776509897; 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=JT31e6v41HB960b0C3q9SW7zBQrY88WWgTBcHfkoW3LaVZ0tc8gNvLoTo9jymBgxsSOoqC 0LfPdhQuYI3mc7fphvjU+jsaYUBpNYBiodSZgYbWQSmtbO/JM/Qv7a37xFCTuRQDdJ0IM1 nHB/XaSO4483gSWvAcg+kGUXPvCi9p0= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 6629040890; Sat, 18 Apr 2026 10:58:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E7C7C2BCB3; Sat, 18 Apr 2026 10:58:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776509896; bh=6tmwrYqrWIbuMw5GfhGQhH/MUUQ+JMHsDHml8bmka3I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IGeA0rJGx3EWp9zaN0FaHGeJ9lm88kv7Bj7KXhkxuDxTaqqIzTlQsYOEk+jLaeFt8 FTyfJkn+83E5IkPSZyF/k1gHsjGb1COu3oaE0i7mUUxIauWfNI8s9ws0BaaB5ZKYq/ 732rTBshW5d65zXNh87oPwri3SVXrEdZ60BlDqmB95Mn18DB1m+EAxoSAN8CY8bv3/ RbyenMAz6F7hQsyOCLvghFYFLYTiaFul8Bw1D4DWM7A7STNWFvg8i586c7KMh4w70l A3J7RNJrd9Kxtd3kG4BFO3d+LvT8zaZIrQt4Fn4S93PGQ8/2UBxJMao4UlR8pkVfxm AuR81iyjr58Kw== 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 , 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 v2 24/53] selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages Date: Sat, 18 Apr 2026 13:55:09 +0300 Message-ID: <20260418105539.1261536-25-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260418105539.1261536-1-rppt@kernel.org> References: <20260418105539.1261536-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 33E19140006 X-Rspamd-Server: rspam12 X-Stat-Signature: gz95xrh6yckfhxnzwtaz6dsxgzb9btua X-Rspam-User: X-HE-Tag: 1776509897-190288 X-HE-Meta: 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 MFpWiPtv 7HAdCV3o6hiwODpuRHwyBa1EmeTGIUdqMwDLr+VELrLOaSxzLizEJRAeZ0bnjash4mf0UFe0bF2+uf8QkrveooPBkBpE9fXUbQJLcaELejxZe/BwDSRQT7l7EB93/ZrTUX89dTZ5NzElXaDbKdO+YbYhFhmT6+HS1t8UWcjggFhuuoI3jqfb9pSuVqdqWcoxATnrs+fkz0J5/FwSB6meJoRtiAYB0Pch+HkU9DdOAWI+MXoyoCHtoVeVaW9M6rkh+uyKi41nwjCa5OvmahR4NuwatE2jFtFTnAgnO 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