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=-9.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 DAFCFC433DF for ; Sun, 16 Aug 2020 12:54:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BB72F20826 for ; Sun, 16 Aug 2020 12:54:34 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="YXanpaO2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728877AbgHPMyK (ORCPT ); Sun, 16 Aug 2020 08:54:10 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:58576 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728440AbgHPMx5 (ORCPT ); Sun, 16 Aug 2020 08:53:57 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1597582436; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5/ZhqaemaIZJrodfmnF3I3t2/SfX8dozv9khOOWmeJY=; b=YXanpaO2QUItGuRi+bqy4bEZ94Kwr70GOVQ/uePBHzrYXdryC+rv2S49jVB+p7K0RB5NWf IIfDuisLtXNuEQB745Mgl4nlJj9YkTXmn+LXrGlb/0JMZ5txMmGzlY5w1YeyJn2MVdCp8E M3zvzul/Lm9w0YJksMEPUFG3TiFvhUQ= 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-417-k7p1B1TFNRW7MXrOOuTcsw-1; Sun, 16 Aug 2020 08:53:54 -0400 X-MC-Unique: k7p1B1TFNRW7MXrOOuTcsw-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 0800F1855199; Sun, 16 Aug 2020 12:53:53 +0000 (UTC) Received: from t480s.redhat.com (ovpn-112-43.ams2.redhat.com [10.36.112.43]) by smtp.corp.redhat.com (Postfix) with ESMTP id 804746E717; Sun, 16 Aug 2020 12:53:48 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: virtualization@lists.linux-foundation.org, linux-mm@kvack.org, David Hildenbrand , Baoquan He , Andrew Morton , Michal Hocko , "Michael S . Tsirkin" , Mike Kravetz , Pankaj Gupta Subject: [PATCH v5 3/6] mm/page_isolation: drop WARN_ON_ONCE() in set_migratetype_isolate() Date: Sun, 16 Aug 2020 14:53:30 +0200 Message-Id: <20200816125333.7434-4-david@redhat.com> In-Reply-To: <20200816125333.7434-1-david@redhat.com> References: <20200816125333.7434-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Inside has_unmovable_pages(), we have a comment describing how unmovable data could end up in ZONE_MOVABLE - via "movablecore". Also, besides checking if the first page in the pageblock is reserved, we don't perform any further checks in case of ZONE_MOVABLE. In case of memory offlining, we set REPORT_FAILURE, properly dump_page() the page and handle the error gracefully. alloc_contig_pages() users currently never allocate from ZONE_MOVABLE. E.g., hugetlb uses alloc_contig_pages() for the allocation of gigantic pages only, which will never end up on the MOVABLE zone (see htlb_alloc_mask()). Reviewed-by: Baoquan He Cc: Andrew Morton Cc: Michal Hocko Cc: Michael S. Tsirkin Cc: Mike Kravetz Cc: Pankaj Gupta Signed-off-by: David Hildenbrand --- mm/page_isolation.c | 15 ++++++--------- 1 file changed, 6 insertions(+), 9 deletions(-) diff --git a/mm/page_isolation.c b/mm/page_isolation.c index 7d7d263ce7f4b..d099aac479601 100644 --- a/mm/page_isolation.c +++ b/mm/page_isolation.c @@ -57,15 +57,12 @@ static int set_migratetype_isolate(struct page *page, int migratetype, int isol_ spin_unlock_irqrestore(&zone->lock, flags); if (!ret) { drain_all_pages(zone); - } else { - WARN_ON_ONCE(zone_idx(zone) == ZONE_MOVABLE); - - if ((isol_flags & REPORT_FAILURE) && unmovable) - /* - * printk() with zone->lock held will likely trigger a - * lockdep splat, so defer it here. - */ - dump_page(unmovable, "unmovable page"); + } else if ((isol_flags & REPORT_FAILURE) && unmovable) { + /* + * printk() with zone->lock held will likely trigger a + * lockdep splat, so defer it here. + */ + dump_page(unmovable, "unmovable page"); } return ret; -- 2.26.2