From patchwork Tue Dec 5 06:52:42 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Xu X-Patchwork-Id: 844592 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3yrXXn2Cc1z9sBZ for ; Tue, 5 Dec 2017 17:54:17 +1100 (AEDT) Received: from localhost ([::1]:46818 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eM77P-0007xi-Cx for incoming@patchwork.ozlabs.org; Tue, 05 Dec 2017 01:54:15 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50912) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eM76c-0007rx-2m for qemu-devel@nongnu.org; Tue, 05 Dec 2017 01:53:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eM76b-0003Lr-48 for qemu-devel@nongnu.org; Tue, 05 Dec 2017 01:53:26 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57420) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eM76a-0003Ld-Rz for qemu-devel@nongnu.org; Tue, 05 Dec 2017 01:53:25 -0500 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 EEB06356EE; Tue, 5 Dec 2017 06:53:23 +0000 (UTC) Received: from xz-mi.nay.redhat.com (dhcp-14-111.nay.redhat.com [10.66.14.111]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8CA9662668; Tue, 5 Dec 2017 06:53:21 +0000 (UTC) From: Peter Xu To: qemu-devel@nongnu.org Date: Tue, 5 Dec 2017 14:52:42 +0800 Message-Id: <20171205065307.21853-4-peterx@redhat.com> In-Reply-To: <20171205065307.21853-1-peterx@redhat.com> References: <20171205065307.21853-1-peterx@redhat.com> 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 [10.5.110.30]); Tue, 05 Dec 2017 06:53:23 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v5 03/28] migration: provide postcopy_fault_thread_notify() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andrea Arcangeli , Juan Quintela , Alexey Perevalov , peterx@redhat.com, "Dr . David Alan Gilbert" Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" A general helper to notify the fault thread. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu --- migration/postcopy-ram.c | 35 ++++++++++++++++++++--------------- migration/postcopy-ram.h | 2 ++ 2 files changed, 22 insertions(+), 15 deletions(-) diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index 9ad4f20f82..032abfbf1a 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -377,25 +377,15 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingState *mis) trace_postcopy_ram_incoming_cleanup_entry(); if (mis->have_fault_thread) { - uint64_t tmp64; - if (qemu_ram_foreach_block(cleanup_range, mis)) { return -1; } - /* - * Tell the fault_thread to exit, it's an eventfd that should - * currently be at 0, we're going to increment it to 1 - */ - tmp64 = 1; + /* Let the fault thread quit */ atomic_set(&mis->fault_thread_quit, 1); - if (write(mis->userfault_event_fd, &tmp64, 8) == 8) { - trace_postcopy_ram_incoming_cleanup_join(); - qemu_thread_join(&mis->fault_thread); - } else { - /* Not much we can do here, but may as well report it */ - error_report("%s: incrementing userfault_event_fd: %s", __func__, - strerror(errno)); - } + postcopy_fault_thread_notify(mis); + trace_postcopy_ram_incoming_cleanup_join(); + qemu_thread_join(&mis->fault_thread); + trace_postcopy_ram_incoming_cleanup_closeuf(); close(mis->userfault_fd); close(mis->userfault_event_fd); @@ -824,6 +814,21 @@ void *postcopy_get_tmp_page(MigrationIncomingState *mis) /* ------------------------------------------------------------------------- */ +void postcopy_fault_thread_notify(MigrationIncomingState *mis) +{ + uint64_t tmp64 = 1; + + /* + * Wakeup the fault_thread. It's an eventfd that should currently + * be at 0, we're going to increment it to 1 + */ + if (write(mis->userfault_event_fd, &tmp64, 8) != 8) { + /* Not much we can do here, but may as well report it */ + error_report("%s: incrementing failed: %s", __func__, + strerror(errno)); + } +} + /** * postcopy_discard_send_init: Called at the start of each RAMBlock before * asking to discard individual ranges. diff --git a/migration/postcopy-ram.h b/migration/postcopy-ram.h index 77ea0fd264..14f6cadcbd 100644 --- a/migration/postcopy-ram.h +++ b/migration/postcopy-ram.h @@ -114,4 +114,6 @@ PostcopyState postcopy_state_get(void); /* Set the state and return the old state */ PostcopyState postcopy_state_set(PostcopyState new_state); +void postcopy_fault_thread_notify(MigrationIncomingState *mis); + #endif