From patchwork Mon Jun 21 05:11:52 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12333771 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 3D1E7C49EA2 for ; Mon, 21 Jun 2021 03:11:48 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id CD61B611C0 for ; Mon, 21 Jun 2021 03:11:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CD61B611C0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 6FEB66B007D; Sun, 20 Jun 2021 23:11:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6E1906B007E; Sun, 20 Jun 2021 23:11:47 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 54FB76B0080; Sun, 20 Jun 2021 23:11:47 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0097.hostedemail.com [216.40.44.97]) by kanga.kvack.org (Postfix) with ESMTP id 22C3C6B007D for ; Sun, 20 Jun 2021 23:11:47 -0400 (EDT) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id B51AD180AD804 for ; Mon, 21 Jun 2021 03:11:46 +0000 (UTC) X-FDA: 78276256212.08.70DE667 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by imf09.hostedemail.com (Postfix) with ESMTP id 65017600056F for ; Mon, 21 Jun 2021 03:11:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624245105; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=E6hTJAwE1ThQJZthX/koVPnKeQXaG7vgSbRZcgpc+Oo=; b=TheNogqCKCKnDJzVKCrMTNvo7GCKkOX/gkmUrBy5h4lYpaAb414P0HPSJpeAqzSwjhZYLT BrAp1q39IdP/RJA5QOZF6cCe+Seu/mttuJJkohRW1FV6phhA6KsB8sHxY/E8ODVmI4Llsp 5ZxCzYR645oKWiTEl5j7YUzxbowSrD8= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-513-vUu3RFF5PXaJKh8IqliPfg-1; Sun, 20 Jun 2021 23:11:42 -0400 X-MC-Unique: vUu3RFF5PXaJKh8IqliPfg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DF467100B3AC; Mon, 21 Jun 2021 03:11:40 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-84.bne.redhat.com [10.64.54.84]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7258460C9D; Mon, 21 Jun 2021 03:11:31 +0000 (UTC) From: Gavin Shan To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, alexander.duyck@gmail.com, akpm@linux-foundation.org, david@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, will@kernel.org, shan.gavin@gmail.com Subject: [PATCH 3/3] arm64: mm: Specify smaller page reporting order Date: Mon, 21 Jun 2021 13:11:52 +0800 Message-Id: <20210621051152.305224-4-gshan@redhat.com> In-Reply-To: <20210621051152.305224-1-gshan@redhat.com> References: <20210621051152.305224-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=TheNogqC; spf=none (imf09.hostedemail.com: domain of gshan@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=gshan@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: y55rtk8atxtxdigwc1u59zhz94ho5r7q X-Rspamd-Queue-Id: 65017600056F X-Rspamd-Server: rspam06 X-HE-Tag: 1624245106-792759 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 page reporting order is stick to @pageblock_order and its size is 512MB when 64KB base page size is chosen. It also means the page reporting won't be started if current freeing page can't come up with a 512MB free area. It's hard when the system memory becomes fragmented. This specifies the page reporting order to 5 when the 64KB base page size is chosen, corresponding to huge page size with 4KB base page size, so that page reporting has more chance to work. Cc: Anshuman Khandual Cc: Will Deacon Cc: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Gavin Shan --- arch/arm64/include/asm/page.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h index 012cffc574e8..b8386e7d7d47 100644 --- a/arch/arm64/include/asm/page.h +++ b/arch/arm64/include/asm/page.h @@ -18,6 +18,19 @@ struct page; struct vm_area_struct; +/* + * The page reporting won't be started if the freeing page can't come up + * with a huge page, which is 512MB with 64KB base page size. It's hard + * to have 512MB free area when the memory becomes fragmented, stop page + * reporting from working properly. So we choose smaller page reporting + * order, which is same to the huge page size (2MB) with 4KB base page + * size. However, more overheads will be introduced because page reporting + * will be running more frequently. + */ +#if defined(CONFIG_PAGE_REPORTING) && defined(CONFIG_ARM64_64K_PAGES) +#define PAGE_REPORTING_ORDER 5 +#endif + extern void copy_page(void *to, const void *from); extern void clear_page(void *to);