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Howlett" , Lance Yang , Leon Romanovsky , Lorenzo Stoakes , Mark Brown , Michal Hocko , Mike Rapoport , Nico Pache , Peter Xu , Ryan Roberts , Shuah Khan , Suren Baghdasaryan , Vlastimil Babka , Zi Yan , linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 24/53] selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages Date: Mon, 6 Apr 2026 17:17:06 +0300 Message-ID: <20260406141735.2179309-25-rppt@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260406141735.2179309-1-rppt@kernel.org> References: <20260406141735.2179309-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: ocqh1cdnjua3mehd9sqan5tsy3oe8wcf X-Rspamd-Queue-Id: 4C2264000D X-Rspamd-Server: rspam09 X-HE-Tag: 1775485206-510379 X-HE-Meta: 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 T5J/Wz+u T78MsFYvlMj+Q3Xh4+7Q2Dmw2wEq6WytHeNITDK/YcoPa7UGE9F/CICo0FEfaHKmm5bE4/RTR9uH2J3h45SzMBuCUGtP8BBXnt8yuLFWqOamW1HfEPscJLIZYndzfwVrucf/PrB9sMLV9YAtDv92/insh1O1hv/UTxdSGybj18JeziL/kPKRnvTp4n+UWA4pNlvkmarTN2D//iirIK1DxOwDmkioTA5zJAj9QuADfqrRBchk5m2+peLIfzOU8kHdRnLMRbUcsCCltzmiZmU11r+yUYWCy7UT7fHwX 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