From patchwork Wed Jun 23 02:34:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Gavin Shan X-Patchwork-Id: 12338781 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 30DFEC2B9F4 for ; Wed, 23 Jun 2021 00:34:13 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 95EF361358 for ; Wed, 23 Jun 2021 00:34:12 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 95EF361358 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 5EF2D6B0071; Tue, 22 Jun 2021 20:34:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5C6986B0072; Tue, 22 Jun 2021 20:34:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 48E896B0073; Tue, 22 Jun 2021 20:34:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0057.hostedemail.com [216.40.44.57]) by kanga.kvack.org (Postfix) with ESMTP id 17F136B0071 for ; Tue, 22 Jun 2021 20:34:11 -0400 (EDT) Received: from smtpin40.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 584FA20BD0 for ; Wed, 23 Jun 2021 00:34:11 +0000 (UTC) X-FDA: 78283116702.40.4D64CDA Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by imf10.hostedemail.com (Postfix) with ESMTP id DF341400038A for ; Wed, 23 Jun 2021 00:34:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624408450; 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=MFAUZb3tcPA6bpe3TEBAPaNE4+HIYJRQM7hRe5cQv/s=; b=CNVOkgHop6a5dTEfXVLRzU32n1SxwtpKXnT3I3LqLXs1REn5triNuLc0eHFj0qF1aMtFt4 3vyk93XuiGbskUUZ5J9U/kiT2j7Qa6k/ahndtUIf0B6h1cm0Tlba+U7szYOJprfUEeon4I VIqGevS4uEJWtjAoayQbsNn7qVo7SCg= 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-295-VStrH9LSOj--h_d0X7GH3A-1; Tue, 22 Jun 2021 20:34:09 -0400 X-MC-Unique: VStrH9LSOj--h_d0X7GH3A-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ABBCFBBEE3; Wed, 23 Jun 2021 00:34:07 +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 BA6C310023AB; Wed, 23 Jun 2021 00:33:57 +0000 (UTC) From: Gavin Shan To: linux-mm@kvack.org Cc: 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 v3 0/4] mm/page_reporting: Make page reporting work on arm64 with 64KB page size Date: Wed, 23 Jun 2021 10:34:14 +0800 Message-Id: <20210623023418.350616-1-gshan@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: DF341400038A X-Stat-Signature: rfwq4s4abfsw97sn7fai6f4otb9dotaw Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=CNVOkgHo; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf10.hostedemail.com: domain of gshan@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=gshan@redhat.com X-HE-Tag: 1624408450-708265 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 ========= 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 Documentation/admin-guide/kernel-parameters.txt | 6 ++++++ drivers/virtio/virtio_balloon.c | 17 +++++++++++++++++ include/linux/page_reporting.h | 3 +++ mm/page_reporting.c | 16 ++++++++++++---- mm/page_reporting.h | 5 ++--- 5 files changed, 40 insertions(+), 7 deletions(-) Reviewed-by: Alexander Duyck