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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 47FB6C433ED for ; Fri, 30 Apr 2021 06:01:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2DEAA61424 for ; Fri, 30 Apr 2021 06:01:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230132AbhD3GC0 (ORCPT ); Fri, 30 Apr 2021 02:02:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:55564 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229712AbhD3GCZ (ORCPT ); Fri, 30 Apr 2021 02:02:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 9BA436101E; Fri, 30 Apr 2021 06:01:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1619762496; bh=SxAenPmzgIuLs1Xwdu6ZrPb/u1jo+xodz3oDSPVpytc=; h=Date:From:To:Subject:In-Reply-To:From; b=LeMBcy6g6Ho3YC+XGucxR+5os6Xh5spEuFP8arV0IRuXbCLbd/Xuji8iyzpNjUAGm Cd62PCuzBxIjz84ZdbQ2vCXTDAq4RqqDqWuq+ELtQ18kLl/Hrn+sXvzCKlWLQE7sDF VLGdvfloCLeTKTuRnyWC3WztrFKBfO2PsATk4liM= Date: Thu, 29 Apr 2021 23:01:36 -0700 From: Andrew Morton To: akpm@linux-foundation.org, linux-mm@kvack.org, liushixin2@huawei.com, mhocko@suse.com, mm-commits@vger.kernel.org, sfr@canb.auug.org.au, torvalds@linux-foundation.org, vbabka@suse.cz, wangkefeng.wang@huawei.com, willy@infradead.org Subject: [patch 164/178] mm, page_alloc: avoid page_to_pfn() in move_freepages() Message-ID: <20210430060136.XMB-uAadL%akpm@linux-foundation.org> In-Reply-To: <20210429225251.02b6386d21b69255b4f6c163@linux-foundation.org> User-Agent: s-nail v14.8.16 Precedence: bulk Reply-To: linux-kernel@vger.kernel.org List-ID: X-Mailing-List: mm-commits@vger.kernel.org From: Kefeng Wang Subject: mm, page_alloc: avoid page_to_pfn() in move_freepages() The start_pfn and end_pfn are already available in move_freepages_block(), there is no need to go back and forth between page and pfn in move_freepages and move_freepages_block, and pfn_valid_within() should validate pfn first before touching the page. Link: https://lkml.kernel.org/r/20210323131215.934472-1-liushixin2@huawei.com Signed-off-by: Kefeng Wang Signed-off-by: Liu Shixin Reviewed-by: Matthew Wilcox (Oracle) Acked-by: Vlastimil Babka Cc: Stephen Rothwell Cc: Michal Hocko Signed-off-by: Andrew Morton --- mm/page_alloc.c | 28 +++++++++++++--------------- 1 file changed, 13 insertions(+), 15 deletions(-) --- a/mm/page_alloc.c~mm-page_alloc-avoid-page_to_pfn-in-move_freepages +++ a/mm/page_alloc.c @@ -2431,19 +2431,21 @@ static inline struct page *__rmqueue_cma * boundary. If alignment is required, use move_freepages_block() */ static int move_freepages(struct zone *zone, - struct page *start_page, struct page *end_page, + unsigned long start_pfn, unsigned long end_pfn, int migratetype, int *num_movable) { struct page *page; + unsigned long pfn; unsigned int order; int pages_moved = 0; - for (page = start_page; page <= end_page;) { - if (!pfn_valid_within(page_to_pfn(page))) { - page++; + for (pfn = start_pfn; pfn <= end_pfn;) { + if (!pfn_valid_within(pfn)) { + pfn++; continue; } + page = pfn_to_page(pfn); if (!PageBuddy(page)) { /* * We assume that pages that could be isolated for @@ -2453,8 +2455,7 @@ static int move_freepages(struct zone *z if (num_movable && (PageLRU(page) || __PageMovable(page))) (*num_movable)++; - - page++; + pfn++; continue; } @@ -2464,7 +2465,7 @@ static int move_freepages(struct zone *z order = buddy_order(page); move_to_free_list(page, zone, order, migratetype); - page += 1 << order; + pfn += 1 << order; pages_moved += 1 << order; } @@ -2474,25 +2475,22 @@ static int move_freepages(struct zone *z int move_freepages_block(struct zone *zone, struct page *page, int migratetype, int *num_movable) { - unsigned long start_pfn, end_pfn; - struct page *start_page, *end_page; + unsigned long start_pfn, end_pfn, pfn; if (num_movable) *num_movable = 0; - start_pfn = page_to_pfn(page); - start_pfn = start_pfn & ~(pageblock_nr_pages-1); - start_page = pfn_to_page(start_pfn); - end_page = start_page + pageblock_nr_pages - 1; + pfn = page_to_pfn(page); + start_pfn = pfn & ~(pageblock_nr_pages - 1); end_pfn = start_pfn + pageblock_nr_pages - 1; /* Do not cross zone boundaries */ if (!zone_spans_pfn(zone, start_pfn)) - start_page = page; + start_pfn = pfn; if (!zone_spans_pfn(zone, end_pfn)) return 0; - return move_freepages(zone, start_page, end_page, migratetype, + return move_freepages(zone, start_pfn, end_pfn, migratetype, num_movable); } _