From mboxrd@z Thu Jan 1 00:00:00 1970 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=-16.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 9D4ECC49361 for ; Mon, 21 Jun 2021 03:11:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7C22E611C0 for ; Mon, 21 Jun 2021 03:11:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230263AbhFUDNm (ORCPT ); Sun, 20 Jun 2021 23:13:42 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:52105 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229877AbhFUDNl (ORCPT ); Sun, 20 Jun 2021 23:13:41 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1624245087; 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=bbiv+cFTXBFp5gF7k53CNJkWgbULAtjtz+qRUfUDDUY=; b=I6llYlEyrLLVW3f27Ji20IptQuTVzyBxE5aWiRIl4AqSOZClrvAaKM3kt7sCUM9xvbC7oM H7E9yyLgmAZu811TN0gAyc8ktjqJABCVaNoqXz7NBYOyh1WeMqYmXNItWRGzBNUKC5DK6E mRN30u/DKU1MLiTVmUiBIFlAN3nroNw= 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-367-GNIjilfyM_mW_SDaATr7RQ-1; Sun, 20 Jun 2021 23:11:26 -0400 X-MC-Unique: GNIjilfyM_mW_SDaATr7RQ-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 6F9FE1835AC2; Mon, 21 Jun 2021 03:11:24 +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 ED79460C9D; Mon, 21 Jun 2021 03:11:21 +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 1/3] mm/page_reporting: Allow to set reporting order Date: Mon, 21 Jun 2021 13:11:50 +0800 Message-Id: <20210621051152.305224-2-gshan@redhat.com> In-Reply-To: <20210621051152.305224-1-gshan@redhat.com> References: <20210621051152.305224-1-gshan@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The macro PAGE_REPORTING_MIN_ORDER is defined as the page reporting threshold. Without a variable, it's impossible to be changed at runtime. This introduces variable (@page_reporting_order) so that the threshold can be changed at runtime. Suggested-by: David Hildenbrand Signed-off-by: Gavin Shan --- Documentation/admin-guide/kernel-parameters.txt | 6 ++++++ mm/page_reporting.c | 8 ++++++-- mm/page_reporting.h | 3 ++- 3 files changed, 14 insertions(+), 3 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index cb89dbdedc46..566c4b9af3cd 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3566,6 +3566,12 @@ off: turn off poisoning (default) on: turn on poisoning + page_reporting.page_reporting_order= + [KNL] Minimal page reporting order + Format: + Adjust the minimal page reporting order. The page + reporting is disabled when it exceeds (MAX_ORDER-1). + panic= [KNL] Kernel behaviour on panic: delay timeout > 0: seconds before rebooting timeout = 0: wait forever diff --git a/mm/page_reporting.c b/mm/page_reporting.c index c50d93ffa252..759b29f6e845 100644 --- a/mm/page_reporting.c +++ b/mm/page_reporting.c @@ -10,6 +10,10 @@ #include "page_reporting.h" #include "internal.h" +unsigned int page_reporting_order = PAGE_REPORTING_MIN_ORDER; +module_param(page_reporting_order, uint, 0644); +MODULE_PARM_DESC(page_reporting_order, "Set page reporting order"); + #define PAGE_REPORTING_DELAY (2 * HZ) static struct page_reporting_dev_info __rcu *pr_dev_info __read_mostly; @@ -229,7 +233,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev, /* Generate minimum watermark to be able to guarantee progress */ watermark = low_wmark_pages(zone) + - (PAGE_REPORTING_CAPACITY << PAGE_REPORTING_MIN_ORDER); + (PAGE_REPORTING_CAPACITY << page_reporting_order); /* * Cancel request if insufficient free memory or if we failed @@ -239,7 +243,7 @@ page_reporting_process_zone(struct page_reporting_dev_info *prdev, return err; /* Process each free list starting from lowest order/mt */ - for (order = PAGE_REPORTING_MIN_ORDER; order < MAX_ORDER; order++) { + for (order = page_reporting_order; order < MAX_ORDER; order++) { for (mt = 0; mt < MIGRATE_TYPES; mt++) { /* We do not pull pages from the isolate free list */ if (is_migrate_isolate(mt)) diff --git a/mm/page_reporting.h b/mm/page_reporting.h index 2c385dd4ddbd..19d58a590cc2 100644 --- a/mm/page_reporting.h +++ b/mm/page_reporting.h @@ -14,6 +14,7 @@ #ifdef CONFIG_PAGE_REPORTING DECLARE_STATIC_KEY_FALSE(page_reporting_enabled); +extern unsigned int page_reporting_order; void __page_reporting_notify(void); static inline bool page_reported(struct page *page) @@ -38,7 +39,7 @@ static inline void page_reporting_notify_free(unsigned int order) return; /* Determine if we have crossed reporting threshold */ - if (order < PAGE_REPORTING_MIN_ORDER) + if (order < page_reporting_order) return; /* This will add a few cycles, but should be called infrequently */ -- 2.23.0