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Wed, 16 Oct 2024 23:45:16 -0700 (PDT) Received: from suhua-virtual-machine.localdomain ([36.112.24.11]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7ea9c715c17sm4313391a12.84.2024.10.16.23.45.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Oct 2024 23:45:16 -0700 (PDT) From: suhua X-Google-Original-From: suhua To: rppt@kernel.org, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, suhua.tanke@gmail.com, suhua Subject: [PATCH] memblock: Uniform initialization all reserved pages to MIGRATE_MOVABLE Date: Thu, 17 Oct 2024 14:44:49 +0800 Message-Id: <20241017064449.5235-1-suhua1@kingsoft.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Stat-Signature: qgtgq41uctbnmik3wgao4ijohmqgyosx X-Rspamd-Queue-Id: E942D20008 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1729147507-787933 X-HE-Meta: U2FsdGVkX198m+tzfEdv0KzkkDFkuJ6lfUtwO/aZTk0pL5uOc7+5lOTa625L28JptUYpKDgXdlorsGG7Ps2u6aIp7Lmyolu3jrCOLC7RPgjFI0HmTJxV750TICQs4Pgr4LEK5X2AeJRx6xFdbdnLVV1JO1QLWYn1DZjfoBm4dTilz5IFyfwSoJz6WdtmTc0Wb0IpGDvfeidch9CcCJtvzuAxgOibwydFWApkmvae98ocSUx6cMWsfrQHhzR1lmevos3bwSuy+U2N3Vr/uHnnhs3y2M2ksvQYppHjZOabgjYtBDfPeEL0whO5mqeFUUczK073+9ucFToAYebXw45JlQsVeP43ClcI5ck8TlZYHq3OycXDlPa3W+Q/l8b7gvz1Bd8pa5Mvd5SBmvZGyrAWjq2txzj+f4S0tyGCQQep3hYSgfSDXvZCG+xkSACy1SkqUHnnKtkwym90mxX5ImHvYwltP0olIxAwj+lTOd4WMPAEguPGpstgMP3kp6LubohR1fFzyfOYdLy4UQTwX5QiC0ruAqr7+A1gLbGFzp8hsYs3N+hXXfS9tQVhcqQ6Lz3jBMdvoiiqfhlV8BlhL6sWueqDHvuIqr7acz5e4LV2lpsBgyn6peP7gFhMPhd88dgoA+5zWOHU7o9qh70W4LT389l7x5TfRJ9YyXH6kB8YqtezWFoXawxCRDw4H86XFNvDXV3bGzIzybL6Fw2s0T3X5YwXMsLLxDiYwNJN/9RNbHTQe1xqkK5mnocgEV87h9ZzhIuCITNxoS6B5saD2T3CzlTSgBMoSmPvlQvU1FkkJacV8Kdp+8hzH5aaVdIpMXhSZY34elZ/I0eKyAXQYccc78x+9ayN9U8zLezY2hoOIxheLHcufsWetgJQUzk08GpCce9lmzmRANdBnfb+18HKwC2+mI7b6/ndGrm5o4EfUIP0nCgpNx/0sfdO0oD/76Ep1NN7b7D+eFtmKiqy4iq 3EbnYSfn 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000019, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Currently when CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set, the reserved pages are initialized to MIGRATE_MOVABLE by default in memmap_init. Reserved memory mainly stores the metadata of struct page. When HUGETLB_PAGE_OPTIMIZE_VMEMMAP_DEFAULT_ON=Y and hugepages are allocated, the memory occupied by the struct page metadata will be freed. Before this patch: when CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set, the freed memory was placed on the Movable list; When CONFIG_DEFERRED_STRUCT_PAGE_INIT=Y, the freed memory was placed on the Unmovable list. After this patch, the freed memory is placed on the Movable list regardless of whether CONFIG_DEFERRED_STRUCT_PAGE_INIT is set. Eg: echo 500000 > /proc/sys/vm/nr_hugepages cat /proc/pagetypeinfo before： Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 … Node 0, zone Normal, type Unmovable 51 2 1 28 53 35 35 43 40 69 3852 Node 0, zone Normal, type Movable 6485 4610 666 202 200 185 208 87 54 2 240 Node 0, zone Normal, type Reclaimable 2 2 1 23 13 1 2 1 0 1 0 Node 0, zone Normal, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Unmovable ≈ 15GB after： Free pages count per migrate type at order 0 1 2 3 4 5 6 7 8 9 10 … Node 0, zone Normal, type Unmovable 0 1 1 0 0 0 0 1 1 1 0 Node 0, zone Normal, type Movable 1563 4107 1119 189 256 368 286 132 109 4 3841 Node 0, zone Normal, type Reclaimable 2 2 1 23 13 1 2 1 0 1 0 Node 0, zone Normal, type HighAtomic 0 0 0 0 0 0 0 0 0 0 0 Node 0, zone Normal, type Isolate 0 0 0 0 0 0 0 0 0 0 0 Signed-off-by: suhua Reviewed-by: Wei Yang --- mm/mm_init.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/mm_init.c b/mm/mm_init.c index 4ba5607aaf19..6dbf2df23eee 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -722,6 +722,10 @@ static void __meminit init_reserved_page(unsigned long pfn, int nid) if (zone_spans_pfn(zone, pfn)) break; } + + if (pageblock_aligned(pfn)) + set_pageblock_migratetype(pfn_to_page(pfn), MIGRATE_MOVABLE); + __init_single_page(pfn_to_page(pfn), pfn, zid, nid); } #else