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=-8.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 C6919C433FF for ; Wed, 7 Aug 2019 18:36:04 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9C9E722296 for ; Wed, 7 Aug 2019 18:36:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9C9E722296 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44380 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hvQn5-0006Bm-PD for qemu-devel@archiver.kernel.org; Wed, 07 Aug 2019 14:36:03 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41315) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hvQmi-0005dS-Ap for qemu-devel@nongnu.org; Wed, 07 Aug 2019 14:35:41 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hvQmh-0007dj-Bl for qemu-devel@nongnu.org; Wed, 07 Aug 2019 14:35:40 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56808) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hvQmh-0007aq-6I for qemu-devel@nongnu.org; Wed, 07 Aug 2019 14:35:39 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1C8BFC065119; Wed, 7 Aug 2019 18:35:38 +0000 (UTC) Received: from work-vm (ovpn-117-204.ams2.redhat.com [10.36.117.204]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3F3355D70D; Wed, 7 Aug 2019 18:35:37 +0000 (UTC) Date: Wed, 7 Aug 2019 19:35:34 +0100 From: "Dr. David Alan Gilbert" To: Wei Yang Message-ID: <20190807183534.GN27871@work-vm> References: <20190805053146.32326-1-richardw.yang@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190805053146.32326-1-richardw.yang@linux.intel.com> User-Agent: Mutt/1.12.1 (2019-06-15) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Wed, 07 Aug 2019 18:35:38 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH v3] migration/postcopy: use mis->bh instead of allocating a QEMUBH X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-devel@nongnu.org, quintela@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" * Wei Yang (richardw.yang@linux.intel.com) wrote: > For migration incoming side, it either quit in precopy or postcopy. It > is safe to use the mis->bh for both instead of allocating a dedicated > QEMUBH for postcopy. > > Signed-off-by: Wei Yang > Reviewed-by: Dr. David Alan Gilbert Hi Wei, Can you check this, the patchew tests came back with a failure which seems bh related; I've not tried it, but can you just see if you can reproduce it? Dave > --- > v3: rebase on latest upstream > v2: fix a typo in change log > --- > migration/savevm.c | 17 ++++------------- > 1 file changed, 4 insertions(+), 13 deletions(-) > > diff --git a/migration/savevm.c b/migration/savevm.c > index 621b6c0465..9bf9d2e5fe 100644 > --- a/migration/savevm.c > +++ b/migration/savevm.c > @@ -1867,16 +1867,10 @@ static int loadvm_postcopy_handle_listen(MigrationIncomingState *mis) > return 0; > } > > - > -typedef struct { > - QEMUBH *bh; > -} HandleRunBhData; > - > static void loadvm_postcopy_handle_run_bh(void *opaque) > { > Error *local_err = NULL; > - HandleRunBhData *data = opaque; > - MigrationIncomingState *mis = migration_incoming_get_current(); > + MigrationIncomingState *mis = opaque; > > /* TODO we should move all of this lot into postcopy_ram.c or a shared code > * in migration.c > @@ -1908,15 +1902,13 @@ static void loadvm_postcopy_handle_run_bh(void *opaque) > runstate_set(RUN_STATE_PAUSED); > } > > - qemu_bh_delete(data->bh); > - g_free(data); > + qemu_bh_delete(mis->bh); > } > > /* After all discards we can start running and asking for pages */ > static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) > { > PostcopyState ps = postcopy_state_set(POSTCOPY_INCOMING_RUNNING); > - HandleRunBhData *data; > > trace_loadvm_postcopy_handle_run(); > if (ps != POSTCOPY_INCOMING_LISTENING) { > @@ -1924,9 +1916,8 @@ static int loadvm_postcopy_handle_run(MigrationIncomingState *mis) > return -1; > } > > - data = g_new(HandleRunBhData, 1); > - data->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, data); > - qemu_bh_schedule(data->bh); > + mis->bh = qemu_bh_new(loadvm_postcopy_handle_run_bh, mis); > + qemu_bh_schedule(mis->bh); > > /* We need to finish reading the stream from the package > * and also stop reading anything more from the stream that loaded the > -- > 2.17.1 > > -- Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK