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,URIBL_BLOCKED,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 7436BC49EA3 for ; Fri, 18 Jun 2021 03:45:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4E4C461245 for ; Fri, 18 Jun 2021 03:45:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231239AbhFRDrH (ORCPT ); Thu, 17 Jun 2021 23:47:07 -0400 Received: from mga06.intel.com ([134.134.136.31]:1056 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230329AbhFRDrG (ORCPT ); Thu, 17 Jun 2021 23:47:06 -0400 IronPort-SDR: Ltv0Y9oLvGAREHZi4ZJjP1sC0p4LUL0EqDrTaOdi0PwQpgWNxhi4xudVVDky6aO80TdGMjqpSa XoKoxM4hbb7w== X-IronPort-AV: E=McAfee;i="6200,9189,10018"; a="267636023" X-IronPort-AV: E=Sophos;i="5.83,281,1616482800"; d="scan'208";a="267636023" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jun 2021 20:44:57 -0700 IronPort-SDR: qre1y2t9vg8YJgpkUnAjXB2PyDD2TieBtFaqjrZwNpX7uwE4Asp0FAL2iItFqRdEwdrcEAWOyc vVNaUyf4WDHQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.83,281,1616482800"; d="scan'208";a="485539825" Received: from shbuild999.sh.intel.com ([10.239.147.94]) by orsmga001.jf.intel.com with ESMTP; 17 Jun 2021 20:44:54 -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 v5 -mm 2/6] mm/memplicy: add page allocation function for MPOL_PREFERRED_MANY policy Date: Fri, 18 Jun 2021 11:44:40 +0800 Message-Id: <1623987884-43576-3-git-send-email-feng.tang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1623987884-43576-1-git-send-email-feng.tang@intel.com> References: <1623987884-43576-1-git-send-email-feng.tang@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org 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 for it just like 'interleave' policy. Link: https://lore.kernel.org/r/20200630212517.308045-9-ben.widawsky@intel.com Suggested-by: Michal Hocko Co-developed-by: Ben Widawsky Signed-off-by: Ben Widawsky Signed-off-by: Feng Tang --- mm/mempolicy.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 17b5800b7dcc..d17bf018efcc 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -2153,6 +2153,25 @@ static struct page *alloc_page_interleave(gfp_t gfp, unsigned order, return page; } +static struct page *alloc_page_preferred_many(gfp_t gfp, unsigned int order, + struct mempolicy *pol) +{ + struct page *page; + + /* + * 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. + */ + page = __alloc_pages(((gfp | __GFP_NOWARN) & ~__GFP_DIRECT_RECLAIM), + order, first_node(pol->nodes), &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. -- 2.7.4