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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 61A43C433FE for ; Wed, 16 Feb 2022 07:38:46 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EE8026B007E; Wed, 16 Feb 2022 02:38:45 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E97876B0080; Wed, 16 Feb 2022 02:38:45 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D600A6B0081; Wed, 16 Feb 2022 02:38:45 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0229.hostedemail.com [216.40.44.229]) by kanga.kvack.org (Postfix) with ESMTP id C88556B007E for ; Wed, 16 Feb 2022 02:38:45 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 88413894AC for ; Wed, 16 Feb 2022 07:38:45 +0000 (UTC) X-FDA: 79147841010.12.6B96FA8 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by imf26.hostedemail.com (Postfix) with ESMTP id C7C6D140008 for ; Wed, 16 Feb 2022 07:38:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1644997124; x=1676533124; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=OLTZxnf5xPbZj+LRRw58ZjFOWu8ol/cmc7XhSDxSJvs=; b=BbJQORvS4whxKotbyXnGxgjeEgK8JSKs0r3wYYGtP1USCA+cUnU/ReNC dNRN7sV2Yps6hq9Q6u5mSiqG/JPSXoD8nuJK01nfO7e0Etos0pJDJZUVE 7U3q2GgO08YhDcDs/ssRym7A6nMFogy56Uq2jQ4tEHn3w+MqPtKV5n4h4 cydzEGcieDwtRYSv5RsPi4gMN0f0bS7VGOuwdybF+dghS8RI9H8MjfYX4 /lnBxKSdcS+IucVoiQnPWYopqglY1MOKXA/S7wsNmCnuEMZRAPhb8efMY l9sZaz5fA/JmkkNjgRje7MFxhbFyJ+6pjnPR+nwsj9noVlItkEJ9zva5s g==; X-IronPort-AV: E=McAfee;i="6200,9189,10259"; a="250281968" X-IronPort-AV: E=Sophos;i="5.88,373,1635231600"; d="scan'208";a="250281968" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2022 23:38:44 -0800 X-IronPort-AV: E=Sophos;i="5.88,373,1635231600"; d="scan'208";a="498414981" Received: from yhuang6-desk2.sh.intel.com ([10.239.13.11]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2022 23:38:40 -0800 From: Huang Ying To: Peter Zijlstra , Mel Gorman , Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Feng Tang , Huang Ying , Dave Hansen , Baolin Wang , Johannes Weiner , Michal Hocko , Rik van Riel , Yang Shi , Zi Yan , Wei Xu , osalvador , Shakeel Butt , zhongjiang-ali Subject: [PATCH -V12 3/3] memory tiering: skip to scan fast memory Date: Wed, 16 Feb 2022 15:38:15 +0800 Message-Id: <20220216073815.2505536-4-ying.huang@intel.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220216073815.2505536-1-ying.huang@intel.com> References: <20220216073815.2505536-1-ying.huang@intel.com> MIME-Version: 1.0 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: C7C6D140008 X-Rspam-User: Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=BbJQORvS; spf=none (imf26.hostedemail.com: domain of ying.huang@intel.com has no SPF policy when checking 134.134.136.24) smtp.mailfrom=ying.huang@intel.com; dmarc=pass (policy=none) header.from=intel.com X-Stat-Signature: zoqc6m7t93mpaqph9ao7tu8ubrabmx1f X-HE-Tag: 1644997124-605082 Content-Transfer-Encoding: quoted-printable 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: If the NUMA balancing isn't used to optimize the page placement among sockets but only among memory types, the hot pages in the fast memory node couldn't be migrated (promoted) to anywhere. So it's unnecessary to scan the pages in the fast memory node via changing their PTE/PMD mapping to be PROT_NONE. So that the page faults could be avoided too. In the test, if only the memory tiering NUMA balancing mode is enabled, t= he number of the NUMA balancing hint faults for the DRAM node is reduced to almost 0 with the patch. While the benchmark score doesn't change visibly. Signed-off-by: "Huang, Ying" Suggested-by: Dave Hansen Tested-by: Baolin Wang Reviewed-by: Baolin Wang Acked-by: Johannes Weiner Cc: Andrew Morton Cc: Michal Hocko Cc: Rik van Riel Cc: Mel Gorman Cc: Peter Zijlstra Cc: Yang Shi Cc: Zi Yan Cc: Wei Xu Cc: osalvador Cc: Shakeel Butt Cc: zhongjiang-ali Cc: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org --- mm/huge_memory.c | 30 +++++++++++++++++++++--------- mm/mprotect.c | 13 ++++++++++++- 2 files changed, 33 insertions(+), 10 deletions(-) diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 406a3c28c026..9ce126cb0cfd 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -34,6 +34,7 @@ #include #include #include +#include =20 #include #include @@ -1766,17 +1767,28 @@ int change_huge_pmd(struct vm_area_struct *vma, p= md_t *pmd, } #endif =20 - /* - * Avoid trapping faults against the zero page. The read-only - * data is likely to be read-cached on the local CPU and - * local/remote hits to the zero page are not interesting. - */ - if (prot_numa && is_huge_zero_pmd(*pmd)) - goto unlock; + if (prot_numa) { + struct page *page; + /* + * Avoid trapping faults against the zero page. The read-only + * data is likely to be read-cached on the local CPU and + * local/remote hits to the zero page are not interesting. + */ + if (is_huge_zero_pmd(*pmd)) + goto unlock; =20 - if (prot_numa && pmd_protnone(*pmd)) - goto unlock; + if (pmd_protnone(*pmd)) + goto unlock; =20 + page =3D pmd_page(*pmd); + /* + * Skip scanning top tier node if normal numa + * balancing is disabled + */ + if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_NORMAL) && + node_is_toptier(page_to_nid(page))) + goto unlock; + } /* * In case prot_numa, we are under mmap_read_lock(mm). It's critical * to not clear pmd intermittently to avoid race with MADV_DONTNEED diff --git a/mm/mprotect.c b/mm/mprotect.c index 0138dfcdb1d8..2fe03e695c81 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include #include @@ -83,6 +84,7 @@ static unsigned long change_pte_range(struct vm_area_st= ruct *vma, pmd_t *pmd, */ if (prot_numa) { struct page *page; + int nid; =20 /* Avoid TLB flush if possible */ if (pte_protnone(oldpte)) @@ -109,7 +111,16 @@ static unsigned long change_pte_range(struct vm_area= _struct *vma, pmd_t *pmd, * Don't mess with PTEs if page is already on the node * a single-threaded process is running on. */ - if (target_node =3D=3D page_to_nid(page)) + nid =3D page_to_nid(page); + if (target_node =3D=3D nid) + continue; + + /* + * Skip scanning top tier node if normal numa + * balancing is disabled + */ + if (!(sysctl_numa_balancing_mode & NUMA_BALANCING_NORMAL) && + node_is_toptier(nid)) continue; } =20 --=20 2.30.2