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=-7.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 ABA02C433E0 for ; Fri, 29 Jan 2021 13:57:49 +0000 (UTC) Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 2DB1964DEB for ; Fri, 29 Jan 2021 13:57:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2DB1964DEB Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=tempfail smtp.mailfrom=dm-devel-bounces@redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611928668; h=from:from:sender:sender: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:list-id:list-help: list-unsubscribe:list-subscribe:list-post; bh=qpbbDXHSRAnoU9Q9Tf0lg3wh6pt+RrdJKEx7TqKQYWU=; b=GDkKkg2W2Ts4teCjhutfd8fkbXrnggmdlL7CciJ0RmYaPesJKquodrHamDSnxoE4SK5/Zw tlkF877ht6rIbAEf7ixy+QETpL0KIFzA6RdqGYH8ApqbG/jGTsD4dl8ueV69NwRvDHPNx3 9e4IzGhNK1hATpxymKpOYU48zEX9nyM= 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-161-m09wdAXnOx6tZlb-W8o_NA-1; Fri, 29 Jan 2021 08:57:45 -0500 X-MC-Unique: m09wdAXnOx6tZlb-W8o_NA-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 2AE8A802B40; Fri, 29 Jan 2021 13:57:39 +0000 (UTC) Received: from colo-mx.corp.redhat.com (colo-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 985655D9C0; Fri, 29 Jan 2021 13:57:37 +0000 (UTC) Received: from lists01.pubmisc.prod.ext.phx2.redhat.com (lists01.pubmisc.prod.ext.phx2.redhat.com [10.5.19.33]) by colo-mx.corp.redhat.com (Postfix) with ESMTP id AE51F50037; Fri, 29 Jan 2021 13:57:34 +0000 (UTC) Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) by lists01.pubmisc.prod.ext.phx2.redhat.com (8.13.8/8.13.8) with ESMTP id 10TDvWvV026099 for ; Fri, 29 Jan 2021 08:57:32 -0500 Received: by smtp.corp.redhat.com (Postfix) id A51345D9C9; Fri, 29 Jan 2021 13:57:32 +0000 (UTC) Received: from agk.fab.redhat.com (agk-dp.fab.redhat.com [10.33.15.10]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B42155D9C0; Fri, 29 Jan 2021 13:57:26 +0000 (UTC) Received: from agk by agk.fab.redhat.com with local (Exim 4.34) id 1l5UH7-00074g-BI; Fri, 29 Jan 2021 13:57:25 +0000 Date: Fri, 29 Jan 2021 13:57:25 +0000 From: Alasdair G Kergon To: Coly Li Message-ID: <20210129135725.GA27059@agk.fab.redhat.com> Mail-Followup-To: Coly Li , "dm-devel@redhat.com" References: <41f1923b-8f45-ff49-e0d9-06bc5a4a6fad@suse.de> Mime-Version: 1.0 In-Reply-To: <41f1923b-8f45-ff49-e0d9-06bc5a4a6fad@suse.de> User-Agent: Mutt/1.4.1i Organization: Red Hat UK Ltd. Registered in England and Wales, number 03798903. Registered Office: Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE. X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-loop: dm-devel@redhat.com Cc: "dm-devel@redhat.com" Subject: Re: [dm-devel] dm thin-volume hung as swap: bug or as-design ? X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Disposition: inline Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit On Fri, Jan 29, 2021 at 06:40:06PM +0800, Coly Li wrote: > Recently I receive a report that whole system hung and no response after > a while with I/O load. The special configuration is the dm thin-pool > volume is used as the swap partition of the system. > My questions are, > - Can a thin-pool volume be used as swap device? Yes in principle, but it won't get much testing as it's not necessarily a particularly sensible configuration. - You'd normally prefer fully-pre-allocated disk space for swap and turn off the zeroing. Is there some use-case where it does make more sense? > - The above description is a bug, or an already know issue which should > be avoided ? Bug. Alasdair -- dm-devel mailing list dm-devel@redhat.com https://www.redhat.com/mailman/listinfo/dm-devel