From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 67CDAC4167B for ; Fri, 8 Dec 2023 02:53:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1573002AbjLHCxE (ORCPT ); Thu, 7 Dec 2023 21:53:04 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38434 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229671AbjLHCxC (ORCPT ); Thu, 7 Dec 2023 21:53:02 -0500 Received: from out-189.mta0.migadu.com (out-189.mta0.migadu.com [IPv6:2001:41d0:1004:224b::bd]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 038E0171D for ; Thu, 7 Dec 2023 18:53:07 -0800 (PST) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. 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 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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