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 X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E40D6C4320A for ; Tue, 3 Aug 2021 05:59:37 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 90F8960F94 for ; Tue, 3 Aug 2021 05:59:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 90F8960F94 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 36A446B005D; Tue, 3 Aug 2021 01:59:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 31BF16B006C; Tue, 3 Aug 2021 01:59:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 230198D0001; Tue, 3 Aug 2021 01:59:37 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0161.hostedemail.com [216.40.44.161]) by kanga.kvack.org (Postfix) with ESMTP id 081496B005D for ; Tue, 3 Aug 2021 01:59:37 -0400 (EDT) Received: from smtpin31.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A1D72181AC9CB for ; Tue, 3 Aug 2021 05:59:36 +0000 (UTC) X-FDA: 78432717552.31.26E3DC2 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by imf18.hostedemail.com (Postfix) with ESMTP id AEEAD4005FDE for ; Tue, 3 Aug 2021 05:59:35 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10064"; a="213579875" X-IronPort-AV: E=Sophos;i="5.84,291,1620716400"; d="scan'208";a="213579875" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Aug 2021 22:59:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,291,1620716400"; d="scan'208";a="479233337" Received: from shbuild999.sh.intel.com ([10.239.146.151]) by fmsmga008.fm.intel.com with ESMTP; 02 Aug 2021 22:59:31 -0700 From: Feng Tang To: linux-mm@kvack.org, Andrew Morton , Michal Hocko , David Rientjes , Dave Hansen , Ben Widawsky Cc: linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Andrea Arcangeli , Mel Gorman , Mike Kravetz , Randy Dunlap , Vlastimil Babka , Andi Kleen , Dan Williams , ying.huang@intel.com, Feng Tang Subject: [PATCH v7 2/5] mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy Date: Tue, 3 Aug 2021 13:59:19 +0800 Message-Id: <1627970362-61305-3-git-send-email-feng.tang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1627970362-61305-1-git-send-email-feng.tang@intel.com> References: <1627970362-61305-1-git-send-email-feng.tang@intel.com> Authentication-Results: imf18.hostedemail.com; dkim=none; spf=none (imf18.hostedemail.com: domain of feng.tang@intel.com has no SPF policy when checking 134.134.136.24) smtp.mailfrom=feng.tang@intel.com; dmarc=fail reason="No valid SPF, No valid DKIM" header.from=intel.com (policy=none) X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: AEEAD4005FDE X-Stat-Signature: d7ga5cga4pd5t16yy58bnqab7a3qqwpt X-HE-Tag: 1627970375-796336 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: The semantics of MPOL_PREFERRED_MANY is similar to MPOL_PREFERRED, that it will first try to allocate memory from the preferred node(s), and fallback to all nodes in system when first try fails. Add a dedicated function alloc_pages_preferred_many() for it just like for 'interleave' policy, which will be used by 2 general memoory allocation APIs: alloc_pages() and alloc_pages_vma() Link: https://lore.kernel.org/r/20200630212517.308045-9-ben.widawsky@intel.com Suggested-by: Michal Hocko Originally-by: Ben Widawsky Co-developed-by: Ben Widawsky Signed-off-by: Ben Widawsky Signed-off-by: Feng Tang --- mm/mempolicy.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 72f7ff760989..a00bb1c48a15 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2166,6 +2166,27 @@ static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, return page; } +static struct page *alloc_pages_preferred_many(gfp_t gfp, unsigned int order, + int nid, struct mempolicy *pol) +{ + struct page *page; + gfp_t preferred_gfp; + + /* + * This is a two pass approach. The first pass will only try the + * preferred nodes but skip the direct reclaim and allow the + * allocation to fail, while the second pass will try all the + * nodes in system. + */ + preferred_gfp = gfp | __GFP_NOWARN; + preferred_gfp &= ~(__GFP_DIRECT_RECLAIM | __GFP_NOFAIL); + page = __alloc_pages(preferred_gfp, order, nid, &pol->nodes); + if (!page) + page = __alloc_pages(gfp, order, numa_node_id(), NULL); + + return page; +} + /** * alloc_pages_vma - Allocate a page for a VMA. * @gfp: GFP flags. @@ -2201,6 +2222,12 @@ struct page *alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma, goto out; } + if (pol->mode == MPOL_PREFERRED_MANY) { + page = alloc_pages_preferred_many(gfp, order, node, pol); + mpol_cond_put(pol); + goto out; + } + if (unlikely(IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && hugepage)) { int hpage_node = node; @@ -2278,6 +2305,9 @@ struct page *alloc_pages(gfp_t gfp, unsigned order) */ if (pol->mode == MPOL_INTERLEAVE) page = alloc_page_interleave(gfp, order, interleave_nodes(pol)); + else if (pol->mode == MPOL_PREFERRED_MANY) + page = alloc_pages_preferred_many(gfp, order, + numa_node_id(), pol); else page = __alloc_pages(gfp, order, policy_node(gfp, pol, numa_node_id()), -- 2.14.1