From patchwork Fri Jun 25 01:47:06 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12343375 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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,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 2BC95C49EAB for ; Thu, 24 Jun 2021 23:46:43 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C5AED613AD for ; Thu, 24 Jun 2021 23:46:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C5AED613AD 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 8D36D6B0036; Thu, 24 Jun 2021 19:46:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 8836D6B005D; Thu, 24 Jun 2021 19:46:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7242E6B006C; Thu, 24 Jun 2021 19:46:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0081.hostedemail.com [216.40.44.81]) by kanga.kvack.org (Postfix) with ESMTP id 3D5E46B0036 for ; Thu, 24 Jun 2021 19:46:40 -0400 (EDT) Received: from smtpin32.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 4FB0421965 for ; Thu, 24 Jun 2021 23:46:40 +0000 (UTC) X-FDA: 78290254560.32.1E8A82A Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf09.hostedemail.com (Postfix) with ESMTP id CC7DB600014E for ; Thu, 24 Jun 2021 23:46:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624578399; 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; bh=bl9881E5iqPq37Z6X5bKMAB1SU1ciCHAnLiuEXiOTY4=; b=cyMobv22D6f5rzXl+kYU+BpNrvdLUEKB6gWldEr3mgIG/4inz9T/R9/9Vj30K6c+zE4Wxd jPOlNSph/2OfCo/OzLO1NuSrbGnZzfOK8OKjXZ2ErDmxNkyDuThie05+yK4OL7+0N1Qn/N oc5yMyVRvlSs4/D0+5qdVGII8CDluIM= 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-376-fABV1JA3OOqePA-Z2swUcA-1; Thu, 24 Jun 2021 19:46:35 -0400 X-MC-Unique: fABV1JA3OOqePA-Z2swUcA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 3D0A3804141; Thu, 24 Jun 2021 23:46:34 +0000 (UTC) Received: from gshan.redhat.com (vpn2-54-70.bne.redhat.com [10.64.54.70]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2788960871; Thu, 24 Jun 2021 23:46:23 +0000 (UTC) From: Gavin Shan To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, alexander.duyck@gmail.com, david@redhat.com, mst@redhat.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, catalin.marinas@arm.com, will@kernel.org, shan.gavin@gmail.com Subject: [PATCH v4 0/4] mm/page_reporting: Make page reporting work on arm64 with 64KB page size Date: Fri, 25 Jun 2021 09:47:06 +0800 Message-Id: <20210625014710.42954-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=cyMobv22; spf=none (imf09.hostedemail.com: domain of gshan@redhat.com has no SPF policy when checking 170.10.133.124) smtp.mailfrom=gshan@redhat.com; dmarc=pass (policy=none) header.from=redhat.com X-Stat-Signature: e7thquswjrejaj9t3ngw4zbcs3xz4bkk X-Rspamd-Queue-Id: CC7DB600014E X-Rspamd-Server: rspam06 X-HE-Tag: 1624578399-214600 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 threshold is currently equal to @pageblock_order, which is 13 and 512MB on arm64 with 64KB base page size selected. The page reporting won't be triggered if the freeing page can't come up with a free area like that huge. The condition is hard to be met, especially when the system memory becomes fragmented. This series intends to solve the issue by having page reporting threshold as 5 (2MB) on arm64 with 64KB base page size. The patches are organized as: PATCH[1/4] Fix some coding style in __page_reporting_request(). PATCH[2/4] Represents page reporting order with variable so that it can be exported as module parameter. PATCH[3/4] Allows the device driver (e.g. virtio_balloon) to specify the page reporting order when the device info is registered. PATCH[4/4] Specifies the page reporting order to 5, corresponding to 2MB in size on ARM64 when 64KB base page size is used. Changelog ========= v4: * Set @page_reporting_order to MAX_ORDER. Its value is specified by the driver or falls back to @pageblock_order when page reporting device is registered. (Alex) * Include "module.h" in page_reporting.c (Andrew) v3: * Avoid overhead introduced by function all (Alex) * Export page reporting order as module parameter (Gavin) v2: * Rewrite the patches as Alex suggested (Alex) Gavin Shan (4): mm/page_reporting: Fix code style in __page_reporting_request() mm/page_reporting: Export reporting order as module parameter mm/page_reporting: Allow driver to specify reporting order virtio_balloon: Specify page reporting order if needed .../admin-guide/kernel-parameters.txt | 6 ++++++ drivers/virtio/virtio_balloon.c | 17 +++++++++++++++++ include/linux/page_reporting.h | 3 +++ mm/page_reporting.c | 19 +++++++++++++++---- mm/page_reporting.h | 5 ++--- 5 files changed, 43 insertions(+), 7 deletions(-)