From patchwork Fri Oct 16 02:44:53 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrew Morton X-Patchwork-Id: 11840631 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 18AB714B4 for ; Fri, 16 Oct 2020 02:44:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id BB99C20878 for ; Fri, 16 Oct 2020 02:44:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="JMglZidr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BB99C20878 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id DA1CB940025; 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Fri, 16 Oct 2020 02:44:55 +0000 (UTC) Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C99F220E65; Fri, 16 Oct 2020 02:44:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1602816294; bh=23D3iXQprOrK9mjmKnujiotZehKcWfPT/m6Xy2QIwB4=; h=Date:From:To:Subject:In-Reply-To:From; b=JMglZidrrgRDKYHkRc+AfCMs5Km++VMIOuL4DUE5u70hX5dcw1/F85liBc1yj2d/i XAdXRBR22dOb6PTY2my7OB/q/Vv9T4sBpmpN9RxgrwkInFCEMnIXZmAhqMbibkinRd /MA4AZVYIyV4xqJLUjZrnNUwYl3Cr8WQGofTLBxo= Date: Thu, 15 Oct 2020 19:44:53 -0700 From: Andrew Morton To: akpm@linux-foundation.org, bhe@redhat.com, charante@codeaurora.org, dan.j.williams@intel.com, david@redhat.com, fenghua.yu@intel.com, linux-mm@kvack.org, logang@deltatee.com, mgorman@suse.de, mgorman@techsingularity.net, mhocko@suse.com, mm-commits@vger.kernel.org, osalvador@suse.de, pankaj.gupta.linux@gmail.com, richard.weiyang@linux.alibaba.com, rppt@kernel.org, tony.luck@intel.com, torvalds@linux-foundation.org, walken@google.com, willy@infradead.org Subject: [patch 063/156] mm/memory_hotplug: drop nr_isolate_pageblock in offline_pages() Message-ID: <20201016024453.UOTCP0gPH%akpm@linux-foundation.org> In-Reply-To: <20201015192732.f448da14e9854c7cb7299956@linux-foundation.org> User-Agent: s-nail v14.8.16 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: From: David Hildenbrand Subject: mm/memory_hotplug: drop nr_isolate_pageblock in offline_pages() We make sure that we cannot have any memory holes right at the beginning of offline_pages() and we only support to online/offline full sections. Both, sections and pageblocks are a power of two in size, and sections always span full pageblocks. We can directly calculate the number of isolated pageblocks from nr_pages. Link: https://lkml.kernel.org/r/20200819175957.28465-6-david@redhat.com Signed-off-by: David Hildenbrand Acked-by: Michal Hocko Reviewed-by: Oscar Salvador Cc: Wei Yang Cc: Baoquan He Cc: Pankaj Gupta Cc: Charan Teja Reddy Cc: Dan Williams Cc: Fenghua Yu Cc: Logan Gunthorpe Cc: "Matthew Wilcox (Oracle)" Cc: Mel Gorman Cc: Mel Gorman Cc: Michel Lespinasse Cc: Mike Rapoport Cc: Tony Luck Signed-off-by: Andrew Morton --- mm/memory_hotplug.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) --- a/mm/memory_hotplug.c~mm-memory_hotplug-drop-nr_isolate_pageblock-in-offline_pages +++ a/mm/memory_hotplug.c @@ -1471,10 +1471,10 @@ int __ref offline_pages(unsigned long st { const unsigned long end_pfn = start_pfn + nr_pages; unsigned long pfn, system_ram_pages = 0; - int ret, node, nr_isolate_pageblock; unsigned long flags; struct zone *zone; struct memory_notify arg; + int ret, node; char *reason; /* We can only offline full sections (e.g., SECTION_IS_ONLINE) */ @@ -1518,7 +1518,6 @@ int __ref offline_pages(unsigned long st reason = "failure to isolate range"; goto failed_removal; } - nr_isolate_pageblock = ret; arg.start_pfn = start_pfn; arg.nr_pages = nr_pages; @@ -1596,7 +1595,7 @@ int __ref offline_pages(unsigned long st * pageblocks zone counter here. */ spin_lock_irqsave(&zone->lock, flags); - zone->nr_isolate_pageblock -= nr_isolate_pageblock; + zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; spin_unlock_irqrestore(&zone->lock, flags); /* removal success */