From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: ARC-Seal: i=1; a=rsa-sha256; t=1521619818; cv=none; d=google.com; s=arc-20160816; b=A1ouWI4ZnmduthW9KYUVB42owEM3WTiOnaYSlbO3OcjBrFyhBqsfpNT32mp7ZetkAp 4sDVrd2b3FYUKTEZ7/P9BXWRa98qdtD+SEXS9M5bETD7FTBL9mZvg9KP73uKs17TeAqD dWhnSAk8Eg/vNiw5VDscjxXhi/9wWNQxHDa7SGTtBGi0fk1+ZNdBphQAd++tM+jMB5L3 sAZZg2DT9f5gll9+d0/XNqR77+hgr9kRx7StZfxePq4bh2W3JnPkwqtP+iOXhmj1b0ph lRBNV519793FxysjLBJpDybnCC/08i9X4+SdJWIFHPMrO7TnY0zMYqbksu7wje7TouYo 7Zag== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=message-id:date:subject:cc:to:from:dkim-signature :arc-authentication-results; bh=LeSb902Uny9512OLam4SfmuXS39SuUeJ6ihtyTMyU8w=; b=ALN+eJzNoM1SBJU1ePGtRRFC/UNRixYTPh5AEZ+xOk2XWWsiX+D+oB8FEpvSlNNZ61 loQ7lmuKOETjUH5121KKEq9JETY3JDShquJ1gN1/7E+90RmefUvGgmirtVvVVElFk9eX YKusPEf0xdvkDMti3RwuZXQD3kJItrBJHUqnvp9YGg2fLgyE9ZqN9/JQ96wBnMrNdVXu KfaiItxLSkWsFbB0Aj/GRdANK0WA3tEapuEi2P3ZJqgOqA42TD8JZwDCazUhE7r07tmJ kJbXGlUJUhg2IBq6o0QL863lkhze+6dj8wTHdRflKSebhIioFudMDkOHHCLhVN4S1tRM 9QLQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=rbUjllbw; spf=pass (google.com: domain of hejianet@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=hejianet@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=rbUjllbw; spf=pass (google.com: domain of hejianet@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=hejianet@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com X-Google-Smtp-Source: AG47ELtoaOQA5oT0vh5oxWmMkAlDsdYLgeRJ98djQ4bCmpm3R7AzByKPJuLuhuRhzrw0pLMZUMdxOg== From: Jia He To: Andrew Morton , Michal Hocko , Catalin Marinas , Mel Gorman , Will Deacon , Mark Rutland , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: Pavel Tatashin , Daniel Jordan , AKASHI Takahiro , Gioh Kim , Steven Sistare , Daniel Vacek , Eugeniu Rosca , Vlastimil Babka , linux-kernel@vger.kernel.org, linux-mm@kvack.org, James Morse , Ard Biesheuvel , Steve Capper , x86@kernel.org, Greg Kroah-Hartman , Kate Stewart , Philippe Ombredanne , Johannes Weiner , Kemi Wang , Petr Tesarik , YASUAKI ISHIMATSU , Andrey Ryabinin , Nikolay Borisov , Jia He Subject: [PATCH RFC 0/4] optimize memblock_next_valid_pfn() and early_pfn_valid() Date: Wed, 21 Mar 2018 01:09:52 -0700 Message-Id: <1521619796-3846-1-git-send-email-hejianet@gmail.com> X-Mailer: git-send-email 2.7.4 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595534022264429563?= X-GMAIL-MSGID: =?utf-8?q?1595534022264429563?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns where possible") tried to optimize the loop in memmap_init_zone(). But there is still some room for improvement. Patch 1 optimized the memblock_next_valid_pfn() Patch 2~4 optimized the early_pfn_valid(), I have to split it into parts because the changes are located across subsystems. I tested the pfn steping up process in memmap_init(), the same as before. As for the performance improvement, after this set, I can see the time overhead of memmap_init() is reduced from 41313 us to 24345 us in my armv8a server(QDF2400 with 96G memory). Attached the memblock region information in my server. [ 86.956758] Zone ranges: [ 86.959452] DMA [mem 0x0000000000200000-0x00000000ffffffff] [ 86.966041] Normal [mem 0x0000000100000000-0x00000017ffffffff] [ 86.972631] Movable zone start for each node [ 86.977179] Early memory node ranges [ 86.980985] node 0: [mem 0x0000000000200000-0x000000000021ffff] [ 86.987666] node 0: [mem 0x0000000000820000-0x000000000307ffff] [ 86.994348] node 0: [mem 0x0000000003080000-0x000000000308ffff] [ 87.001029] node 0: [mem 0x0000000003090000-0x00000000031fffff] [ 87.007710] node 0: [mem 0x0000000003200000-0x00000000033fffff] [ 87.014392] node 0: [mem 0x0000000003410000-0x000000000563ffff] [ 87.021073] node 0: [mem 0x0000000005640000-0x000000000567ffff] [ 87.027754] node 0: [mem 0x0000000005680000-0x00000000056dffff] [ 87.034435] node 0: [mem 0x00000000056e0000-0x00000000086fffff] [ 87.041117] node 0: [mem 0x0000000008700000-0x000000000871ffff] [ 87.047798] node 0: [mem 0x0000000008720000-0x000000000894ffff] [ 87.054479] node 0: [mem 0x0000000008950000-0x0000000008baffff] [ 87.061161] node 0: [mem 0x0000000008bb0000-0x0000000008bcffff] [ 87.067842] node 0: [mem 0x0000000008bd0000-0x0000000008c4ffff] [ 87.074524] node 0: [mem 0x0000000008c50000-0x0000000008e2ffff] [ 87.081205] node 0: [mem 0x0000000008e30000-0x0000000008e4ffff] [ 87.087886] node 0: [mem 0x0000000008e50000-0x0000000008fcffff] [ 87.094568] node 0: [mem 0x0000000008fd0000-0x000000000910ffff] [ 87.101249] node 0: [mem 0x0000000009110000-0x00000000092effff] [ 87.107930] node 0: [mem 0x00000000092f0000-0x000000000930ffff] [ 87.114612] node 0: [mem 0x0000000009310000-0x000000000963ffff] [ 87.121293] node 0: [mem 0x0000000009640000-0x000000000e61ffff] [ 87.127975] node 0: [mem 0x000000000e620000-0x000000000e64ffff] [ 87.134657] node 0: [mem 0x000000000e650000-0x000000000fffffff] [ 87.141338] node 0: [mem 0x0000000010800000-0x0000000017feffff] [ 87.148019] node 0: [mem 0x000000001c000000-0x000000001c00ffff] [ 87.154701] node 0: [mem 0x000000001c010000-0x000000001c7fffff] [ 87.161383] node 0: [mem 0x000000001c810000-0x000000007efbffff] [ 87.168064] node 0: [mem 0x000000007efc0000-0x000000007efdffff] [ 87.174746] node 0: [mem 0x000000007efe0000-0x000000007efeffff] [ 87.181427] node 0: [mem 0x000000007eff0000-0x000000007effffff] [ 87.188108] node 0: [mem 0x000000007f000000-0x00000017ffffffff] [ 87.194791] Initmem setup node 0 [mem 0x0000000000200000-0x00000017ffffffff] Without this patchset: [ 117.106153] Initmem setup node 0 [mem 0x0000000000200000-0x00000017ffffffff] [ 117.113677] before memmap_init [ 117.118195] after memmap_init >>> memmap_init takes 4518 us [ 117.121446] before memmap_init [ 117.154992] after memmap_init >>> memmap_init takes 33546 us [ 117.158241] before memmap_init [ 117.161490] after memmap_init >>> memmap_init takes 3249 us >>> totally takes 41313 us With this patchset: [ 87.194791] Initmem setup node 0 [mem 0x0000000000200000-0x00000017ffffffff] [ 87.202314] before memmap_init [ 87.206164] after memmap_init >>> memmap_init takes 3850 us [ 87.209416] before memmap_init [ 87.226662] after memmap_init >>> memmap_init takes 17246 us [ 87.229911] before memmap_init [ 87.233160] after memmap_init >>> memmap_init takes 3249 us >>> totally takes 24345 us Jia He (4): mm: page_alloc: reduce unnecessary binary search in memblock_next_valid_pfn() mm/memblock: introduce memblock_search_pfn_regions() arm64: introduce pfn_valid_region() mm: page_alloc: reduce unnecessary binary search in early_pfn_valid() arch/arm64/include/asm/page.h | 3 ++- arch/arm64/mm/init.c | 19 ++++++++++++++++++- arch/x86/include/asm/mmzone_32.h | 2 +- include/linux/memblock.h | 3 ++- include/linux/mmzone.h | 12 +++++++++--- mm/memblock.c | 35 +++++++++++++++++++++++++++++++---- mm/page_alloc.c | 5 +++-- 7 files changed, 66 insertions(+), 13 deletions(-) -- 2.7.4