From patchwork Fri Jun 25 04:21:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12343501 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 DDA01C49EA6 for ; Fri, 25 Jun 2021 02:20:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 5DB54613C0 for ; Fri, 25 Jun 2021 02:20:58 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5DB54613C0 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 404FC6B0036; Thu, 24 Jun 2021 22:20:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3E8466B005D; Thu, 24 Jun 2021 22:20:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 27DFB6B006C; Thu, 24 Jun 2021 22:20:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0134.hostedemail.com [216.40.44.134]) by kanga.kvack.org (Postfix) with ESMTP id EE3426B0036 for ; Thu, 24 Jun 2021 22:20:56 -0400 (EDT) Received: from smtpin33.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 19C50810C45C for ; Fri, 25 Jun 2021 02:20:57 +0000 (UTC) X-FDA: 78290643354.33.3AAE3DB Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf05.hostedemail.com (Postfix) with ESMTP id B12D8E000244 for ; Fri, 25 Jun 2021 02:20:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624587656; 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=FUVevOBJKOHME2+koqTYq7Ae8rIdtCaF17FidUos6Rw=; b=i2iAPlKrmQ6lomtJfZCxqCF/I6jDP9fNunW/TEhnxaZKQIRbKYHOXmjsHpIjDMJy7LqjEu MGyLg+D5TgIEfgdoif/fgBWAosxzTNjX18vf9zbcu/17IzMfXWRw7OMpSTMsGGA5nukRiw qWB4jSi7dieOv9+DAdqnc2vJTjoIjg8= 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-142-kWeybz1jPm2YDFcPcGVJpg-1; Thu, 24 Jun 2021 22:20:52 -0400 X-MC-Unique: kWeybz1jPm2YDFcPcGVJpg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id BCA5E18414A4; Fri, 25 Jun 2021 02:20:50 +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 18CB15C1A3; Fri, 25 Jun 2021 02:20:40 +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 v5 0/4] mm/page_reporting: Make page reporting work on arm64 with 64KB page size Date: Fri, 25 Jun 2021 12:21:46 +0800 Message-Id: <20210625042150.46964-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: B12D8E000244 Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=i2iAPlKr; spf=none (imf05.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: 4pkjggj4ee5p84mzsdzsp4byzji3g9i7 X-HE-Tag: 1624587656-699790 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 ========= v5: * Restore @page_reporting_order to @pageblock_order when device is registered in PATCH[2/4] to keep "git bisect" friendly at least. (Alex) 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 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 | 22 +++++++++++++++---- mm/page_reporting.h | 5 ++--- 5 files changed, 46 insertions(+), 7 deletions(-)