From nobody Mon Feb 9 02:28:46 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 151012103875441.812832575397806; Tue, 7 Nov 2017 22:03:58 -0800 (PST) Received: from localhost ([::1]:57430 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eCJSa-0000N2-Kz for importer@patchew.org; Wed, 08 Nov 2017 01:03:36 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35687) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1eCJQp-0007s6-HY for qemu-devel@nongnu.org; Wed, 08 Nov 2017 01:01:48 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1eCJQm-0006Oh-GW for qemu-devel@nongnu.org; Wed, 08 Nov 2017 01:01:47 -0500 Received: from mx1.redhat.com ([209.132.183.28]:46330) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1eCJQm-0006OV-8M for qemu-devel@nongnu.org; Wed, 08 Nov 2017 01:01:44 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 41E1D6A7C3; Wed, 8 Nov 2017 06:01:43 +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 1503E649A8; Wed, 8 Nov 2017 06:01:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 41E1D6A7C3 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=peterx@redhat.com From: Peter Xu To: qemu-devel@nongnu.org Date: Wed, 8 Nov 2017 14:01:00 +0800 Message-Id: <20171108060130.3772-3-peterx@redhat.com> In-Reply-To: <20171108060130.3772-1-peterx@redhat.com> References: <20171108060130.3772-1-peterx@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 08 Nov 2017 06:01:43 +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 v4 02/32] migration: reuse mis->userfault_quit_fd 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+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" It was only used for quitting the page fault thread before. Let it be something more useful - now we can use it to notify a "wake" for the page fault thread (for any reason), and it only means "quit" if the fault_thread_quit is set. Since we changed what it does, renaming it to userfault_event_fd. Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Peter Xu --- migration/migration.h | 6 ++++-- migration/postcopy-ram.c | 29 ++++++++++++++++++++--------- 2 files changed, 24 insertions(+), 11 deletions(-) diff --git a/migration/migration.h b/migration/migration.h index 663415fe48..6d36400975 100644 --- a/migration/migration.h +++ b/migration/migration.h @@ -36,6 +36,8 @@ struct MigrationIncomingState { bool have_fault_thread; QemuThread fault_thread; QemuSemaphore fault_thread_sem; + /* Set this when we want the fault thread to quit */ + bool fault_thread_quit; =20 bool have_listen_thread; QemuThread listen_thread; @@ -43,8 +45,8 @@ struct MigrationIncomingState { =20 /* For the kernel to send us notifications */ int userfault_fd; - /* To tell the fault_thread to quit */ - int userfault_quit_fd; + /* To notify the fault_thread to wake, e.g., when need to quit */ + int userfault_event_fd; QEMUFile *to_src_file; QemuMutex rp_mutex; /* We send replies from multiple threads */ void *postcopy_tmp_page; diff --git a/migration/postcopy-ram.c b/migration/postcopy-ram.c index bec6c2c66b..9ad4f20f82 100644 --- a/migration/postcopy-ram.c +++ b/migration/postcopy-ram.c @@ -387,17 +387,18 @@ int postcopy_ram_incoming_cleanup(MigrationIncomingSt= ate *mis) * currently be at 0, we're going to increment it to 1 */ tmp64 =3D 1; - if (write(mis->userfault_quit_fd, &tmp64, 8) =3D=3D 8) { + atomic_set(&mis->fault_thread_quit, 1); + if (write(mis->userfault_event_fd, &tmp64, 8) =3D=3D 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_quit_fd: %s", __func_= _, + error_report("%s: incrementing userfault_event_fd: %s", __func= __, strerror(errno)); } trace_postcopy_ram_incoming_cleanup_closeuf(); close(mis->userfault_fd); - close(mis->userfault_quit_fd); + close(mis->userfault_event_fd); mis->have_fault_thread =3D false; } =20 @@ -520,7 +521,7 @@ static void *postcopy_ram_fault_thread(void *opaque) pfd[0].fd =3D mis->userfault_fd; pfd[0].events =3D POLLIN; pfd[0].revents =3D 0; - pfd[1].fd =3D mis->userfault_quit_fd; + pfd[1].fd =3D mis->userfault_event_fd; pfd[1].events =3D POLLIN; /* Waiting for eventfd to go positive */ pfd[1].revents =3D 0; =20 @@ -530,8 +531,18 @@ static void *postcopy_ram_fault_thread(void *opaque) } =20 if (pfd[1].revents) { - trace_postcopy_ram_fault_thread_quit(); - break; + uint64_t tmp64 =3D 0; + + /* Consume the signal */ + if (read(mis->userfault_event_fd, &tmp64, 8) !=3D 8) { + /* Nothing obviously nicer than posting this error. */ + error_report("%s: read() failed", __func__); + } + + if (atomic_read(&mis->fault_thread_quit)) { + trace_postcopy_ram_fault_thread_quit(); + break; + } } =20 ret =3D read(mis->userfault_fd, &msg, sizeof(msg)); @@ -610,9 +621,9 @@ int postcopy_ram_enable_notify(MigrationIncomingState *= mis) } =20 /* Now an eventfd we use to tell the fault-thread to quit */ - mis->userfault_quit_fd =3D eventfd(0, EFD_CLOEXEC); - if (mis->userfault_quit_fd =3D=3D -1) { - error_report("%s: Opening userfault_quit_fd: %s", __func__, + mis->userfault_event_fd =3D eventfd(0, EFD_CLOEXEC); + if (mis->userfault_event_fd =3D=3D -1) { + error_report("%s: Opening userfault_event_fd: %s", __func__, strerror(errno)); close(mis->userfault_fd); return -1; --=20 2.13.6