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Tue, 02 Jul 2024 17:52:00 -0700 (PDT) Received: from localhost ([185.92.221.13]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-586132502ecsm6351257a12.40.2024.07.02.17.52.00 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Tue, 02 Jul 2024 17:52:00 -0700 (PDT) From: Wei Yang To: rppt@kernel.org, akpm@linux-foundation.org, brauner@kernel.org, oleg@redhat.com, mjguzik@gmail.com, tandersen@netflix.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, david@redhat.com, Wei Yang Subject: [PATCH v3 1/3] mm/memblock: introduce a new helper memblock_estimated_nr_pages() Date: Wed, 3 Jul 2024 00:51:49 +0000 Message-Id: <20240703005151.28712-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: BDB7A2000E X-Stat-Signature: nwrhtu8o1dbcahabon51kmxb46hb3xoy X-HE-Tag: 1719967922-497621 X-HE-Meta: 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 venwjmbh 2qoyeeHHYUdu6/2O9e05JJ+viXEn4MlNMAGVVVzAFp/+zBqrWGsfRs5M3X1Y/UQw2+au9+4tfjK195KVFCI10Ma644BwQuNxUCnjg7PtzU7iTFUQtiGodL7wOjOmKPKdqUyCVuJD2k8W49LmvTn/54GvrV9Vd7PidRm3TyJJraPGcUSwoCz79nTjH1yIvX/6YJ/TQyPDCJ/4KJV/MtEZAz+ZP47ubBRDd/chbDzNtjL1h7xr850tltRnUc9ODICWLGiSYuTz/rglaMc7vpxfunIbaxQnpshIRmbrH9HMLo21sP0XlkCbg2Z3Q+TFM93mV+5j2W9BFtjNVkiCDalBv+rMT1ZlKRJwmqhfMMWaRQSIaVjZBwF1LEnzvNkFyZj4HYeJWe7euTTQKh1yTFI14G1OZlf+HljOEAphZHF/RTQqVgnyBAZMFVjwIpO/UmKygul0kqpUYQEhULpmFCTni5zJnaA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Instead of using raw memblock api, we wrap a new helper for user. Signed-off-by: Wei Yang Signed-off-by: Wei Yang Reviewed-by: David Hildenbrand --- include/linux/memblock.h | 1 + mm/memblock.c | 19 +++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 40c62aca36ec..7d1c32b3dc12 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -486,6 +486,7 @@ static inline __init_memblock bool memblock_bottom_up(void) phys_addr_t memblock_phys_mem_size(void); phys_addr_t memblock_reserved_size(void); +unsigned long memblock_estimated_nr_pages(void); phys_addr_t memblock_start_of_DRAM(void); phys_addr_t memblock_end_of_DRAM(void); void memblock_enforce_memory_limit(phys_addr_t memory_limit); diff --git a/mm/memblock.c b/mm/memblock.c index e81fb68f7f88..c1f1aac0459f 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1729,6 +1729,25 @@ phys_addr_t __init_memblock memblock_reserved_size(void) return memblock.reserved.total_size; } +/** + * memblock_estimated_nr_pages - return number of pages from memblock point of + * view + * + * During bootup, system may need number of pages in the whole system to do + * some calculation before all pages are freed to buddy system, especially + * when CONFIG_DEFERRED_STRUCT_PAGE_INIT is enabled. + * + * At this point, we can get this information from memblock. Since the system + * state is not settle down and address alignment, the value is an estimation. + * + * Return: + * An estimated number of pages from memblock point of view. + */ +unsigned long __init memblock_estimated_nr_pages(void) +{ + return PHYS_PFN(memblock_phys_mem_size() - memblock_reserved_size()); +} + /* lowest address */ phys_addr_t __init_memblock memblock_start_of_DRAM(void) {