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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1702003983; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=RgAHVYTr05aBZP5gwX6wkJhQrJFR+7p9J4OyUiik14Q=; b=bM5YHNJMsiPP7Mwk8RRfz94bVPAFboFI53wRgX2BsAdbKgW/QsNQlTUt8k8fNDZRsBmagI +Huu65FRujg6hfv9bGexcmytUc+4DIrTnxbh1XSDJIHUlWDQSvcquLsNdxCXVbj17nguso bjukddYUuSdpiVcRcTB602XbO10Khpc= From: Gang Li To: David Hildenbrand , David Rientjes , Mike Kravetz , Muchun Song , Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, ligang.bdlg@bytedance.com, Gang Li Subject: [RFC PATCH v2 0/5] hugetlb: parallelize hugetlb page init on boot Date: Fri, 8 Dec 2023 10:52:35 +0800 Message-Id: <20231208025240.4744-1-gang.li@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 8B84716001B X-Rspam-User: X-Stat-Signature: z73cihfoic4t3apsrtjttykxtww4143h X-Rspamd-Server: rspam03 X-HE-Tag: 1702003986-160172 X-HE-Meta: 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 jzh9rH65 le7785GZWjCSECQ4fAt3MOTSlpShoHARTnrwu7ISQ1oMCNQA6K44eUSkKJI0VKO7faNUC6qz/PdTMhwDGDDTeoTDnrG/YPCuCmaWkXUhMcJBhwCXYomkoWhkYUZX3Hn7wX+7hB0ft1Z56Y8xYmobUSaWu5IehximlNszyKwkKt67UD7D5d7zjqtVeONHZvVxyesQ+ghSZHT64ps1TrPgbqxKTw2uSMvJOwVf7OxMv/W5cR8S0ysZtB3K/cA== 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: Hi all, hugetlb init parallelization has now been updated to v2. To David Hildenbrand: padata multithread utilities has been used to reduce code complexity. To David Rientjes: The patch for measuring time will be separately included in the reply. Please test during your free time, thanks. # Introduction Hugetlb initialization during boot takes up a considerable amount of time. For instance, on a 2TB system, initializing 1,800 1GB huge pages takes 1-2 seconds out of 10 seconds. Initializing 11,776 1GB pages on a 12TB Intel host takes 65.2 seconds [1], which is 17.4% of the total 373.78 seconds boot time. This is a noteworthy figure. Inspired by [2] and [3], hugetlb initialization can also be accelerated through parallelization. Kernel already has infrastructure like padata_do_multithreaded, this patch uses it to achieve effective results by minimal modifications. [1] https://lore.kernel.org/all/783f8bac-55b8-5b95-eb6a-11a583675000@google.com/ [2] https://lore.kernel.org/all/20200527173608.2885243-1-daniel.m.jordan@oracle.com/ [3] https://lore.kernel.org/all/20230906112605.2286994-1-usama.arif@bytedance.com/ # Test result test no patch(ms) patched(ms) saved ------------------- -------------- ------------- -------- 256c2t(4 node) 2M 2624 956 63.57% 256c2t(4 node) 1G 2679 1582 40.95% 128c1t(2 node) 2M 1788 684 61.74% 128c1t(2 node) 1G 3160 1618 48.80% # Change log Changes in v2: - Reduce complexity with `padata_do_multithreaded` - Support 1G hugetlb v1: - https://lore.kernel.org/all/20231123133036.68540-1-gang.li@linux.dev/ - parallelize 2M hugetlb initialization with workqueue Gang Li (5): hugetlb: code clean for hugetlb_hstate_alloc_pages hugetlb: split hugetlb_hstate_alloc_pages padata: dispatch works on different nodes hugetlb: parallelize 2M hugetlb allocation and initialization hugetlb: parallelize 1G hugetlb initialization include/linux/hugetlb.h | 2 +- include/linux/padata.h | 2 + kernel/padata.c | 8 +- mm/hugetlb.c | 201 +++++++++++++++++++++++++++------------- mm/mm_init.c | 1 + 5 files changed, 148 insertions(+), 66 deletions(-) -- 2.30.2