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[70.53.202.134]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-5103d1c657bsm812311cf.3.2026.04.30.10.33.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Apr 2026 10:33:39 -0700 (PDT) Message-ID: <1ad27a46-543b-4799-924a-c13147bf68ca@redhat.com> Date: Thu, 30 Apr 2026 13:33:37 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 25/54] selftests/mm: hugepage_settings: add APIs to get and set nr_hugepages To: Mike Rapoport , 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 , 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 References: <20260428204240.1924129-1-rppt@kernel.org> <20260428204240.1924129-26-rppt@kernel.org> From: Luiz Capitulino In-Reply-To: <20260428204240.1924129-26-rppt@kernel.org> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: JgJzVEsypoZWpbasKFqz-vnCcVQTN-JYYfUAr5BcEIk_1777570420 X-Mimecast-Originator: redhat.com Content-Language: en-US, en-CA Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: 3egj3nsd5sgcpt4it4rxzcwxnqwmot5q X-Rspamd-Queue-Id: 99C41140003 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1777570423-914706 X-HE-Meta: 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 bwgMrfyd 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-04-28 16:42, Mike Rapoport wrote: > 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) Reviewed-by: Luiz Capitulino > --- > .../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__ */