From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9349F359A8C; Sat, 18 Apr 2026 10:58:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776509896; cv=none; b=SIhUBmARHMUMXBy5DrALVRE8UfGVnVOO5MIgk2Tf+1EGw9tYf2lMZfCYJBfSs/P7g++qhiRhKqnDyluHAqAWcATrYepgohwQAhdpbGXlsbYc+ZoaXIaEOcO2q+2wTv8Wc0jAukvlZ9bCevdLQc/pVrNE/J1tTSGv4jbjgzTH+GU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776509896; c=relaxed/simple; bh=6tmwrYqrWIbuMw5GfhGQhH/MUUQ+JMHsDHml8bmka3I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fRGT362nKS6vUEpBoD6d91MUPJDRlbOevdFu24hS7KsGK8Aq125NYX1lieSC1yTr+WfWiJAEirwNizk99T2TF4Pxmrejz+zNhZl+b37aBcZiu0XfIEA0cVSoc1LGaFFzNAO82u5kzSQMnDSqF1QYZufi9E56bvH5hFi/JdKur3c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=IGeA0rJG; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="IGeA0rJG" 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> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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