From nobody Mon Feb 9 17:37:48 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1565748380; cv=none; d=zoho.com; s=zohoarc; b=XNLi+5+GCd/rdh92kh0bn2/o1VvcncP8Vg3IzA39u6bOyWvC/RHvamuz7j/O3R9X9hCFqDL+kbEd0V69AV7geGfYCwSmJOSxL7/2aTKCKwcqVXyuXFUWfHeSJscKRYEXdTbTzdf+5HsUikoHRdlqFoxS3f70vwdkDJyxY1WERU8= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1565748380; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=UHFusiui40fRizOzMd03hkkLn5NLXLywM7aGg7nAPds=; b=Mcp1eZxN+lLd9qxltAnLpmZ6XCK+JHNK9IWnyV0/LbSLLAog/joazRl54ZNH9AlwatS+kUWOmlo1x/33RaaVVKXcSQQwx4ENFFSWBGZLNxbxZydYL4KQf7ls4AO98GFtquc9isQ9GhJ/v6cVQMbbBvQ1Yx2bGDqPGoKFLNBgCeU= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1565748380210246.7083342538184; Tue, 13 Aug 2019 19:06:20 -0700 (PDT) Received: from localhost ([::1]:56612 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hxig6-0005YK-Mn for importer@patchew.org; Tue, 13 Aug 2019 22:06:18 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:50966) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1hxicS-0001FD-N5 for qemu-devel@nongnu.org; Tue, 13 Aug 2019 22:02:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hxicR-0005IK-MH for qemu-devel@nongnu.org; Tue, 13 Aug 2019 22:02:32 -0400 Received: from mx1.redhat.com ([209.132.183.28]:37240) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hxicR-0005I5-Dh for qemu-devel@nongnu.org; Tue, 13 Aug 2019 22:02:31 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id BB0378E589 for ; Wed, 14 Aug 2019 02:02:30 +0000 (UTC) Received: from localhost.localdomain (ovpn-117-78.ams2.redhat.com [10.36.117.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id B309E7AB44; Wed, 14 Aug 2019 02:02:26 +0000 (UTC) From: Juan Quintela To: qemu-devel@nongnu.org Date: Wed, 14 Aug 2019 04:02:15 +0200 Message-Id: <20190814020218.1868-4-quintela@redhat.com> In-Reply-To: <20190814020218.1868-1-quintela@redhat.com> References: <20190814020218.1868-1-quintela@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Wed, 14 Aug 2019 02:02:30 +0000 (UTC) Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH 3/6] migration: Make sure that all multifd channels have been created 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: "Dr. David Alan Gilbert" , Juan Quintela Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Type: text/plain; charset="utf-8" If we start the migration before all have been created, we have to handle the case that one channel still don't exist. This way it is easier. Signed-off-by: Juan Quintela --- migration/ram.c | 14 ++++++++++++++ migration/trace-events | 1 + 2 files changed, 15 insertions(+) diff --git a/migration/ram.c b/migration/ram.c index 4bdd201a4e..4a6ae677a9 100644 --- a/migration/ram.c +++ b/migration/ram.c @@ -663,6 +663,8 @@ typedef struct { uint64_t num_pages; /* syncs main thread and channels */ QemuSemaphore sem_sync; + /* thread has started and setup is done */ + QemuSemaphore started; } MultiFDSendParams; =20 typedef struct { @@ -1039,6 +1041,7 @@ void multifd_save_cleanup(void) qemu_mutex_destroy(&p->mutex); qemu_sem_destroy(&p->sem); qemu_sem_destroy(&p->sem_sync); + qemu_sem_destroy(&p->started); g_free(p->name); p->name =3D NULL; multifd_pages_clear(p->pages); @@ -1113,6 +1116,8 @@ static void *multifd_send_thread(void *opaque) /* initial packet */ p->num_packets =3D 1; =20 + qemu_sem_post(&p->started); + while (true) { qemu_sem_wait(&p->sem); qemu_mutex_lock(&p->mutex); @@ -1229,6 +1234,7 @@ int multifd_save_setup(void) qemu_mutex_init(&p->mutex); qemu_sem_init(&p->sem, 0); qemu_sem_init(&p->sem_sync, 0); + qemu_sem_init(&p->started, 0); p->quit =3D false; p->pending_job =3D 0; p->id =3D i; @@ -3486,6 +3492,14 @@ static int ram_save_setup(QEMUFile *f, void *opaque) ram_control_before_iterate(f, RAM_CONTROL_SETUP); ram_control_after_iterate(f, RAM_CONTROL_SETUP); =20 + /* We want to wait for all threads to have started before doing + * anything else */ + for (int i =3D 0; i < migrate_multifd_channels(); i++) { + MultiFDSendParams *p =3D &multifd_send_state->params[i]; + + qemu_sem_wait(&p->started); + trace_multifd_send_thread_started(p->id); + } multifd_send_sync_main(); qemu_put_be64(f, RAM_SAVE_FLAG_EOS); qemu_fflush(f); diff --git a/migration/trace-events b/migration/trace-events index 886ce70ca0..dd13a5c4b1 100644 --- a/migration/trace-events +++ b/migration/trace-events @@ -95,6 +95,7 @@ multifd_send_sync_main_wait(uint8_t id) "channel %d" multifd_send_terminate_threads(bool error) "error %d" multifd_send_thread_end(uint8_t id, uint64_t packets, uint64_t pages) "cha= nnel %d packets %" PRIu64 " pages %" PRIu64 multifd_send_thread_start(uint8_t id) "%d" +multifd_send_thread_started(uint8_t id) "channel %d" ram_discard_range(const char *rbname, uint64_t start, size_t len) "%s: sta= rt: %" PRIx64 " %zx" ram_load_loop(const char *rbname, uint64_t addr, int flags, void *host) "%= s: addr: 0x%" PRIx64 " flags: 0x%x host: %p" ram_load_postcopy_loop(uint64_t addr, int flags) "@%" PRIx64 " %x" --=20 2.21.0