From nobody Mon Feb 9 00:43:15 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1638269318458612.8066678982716; Tue, 30 Nov 2021 02:48:38 -0800 (PST) Received: from localhost ([::1]:49712 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ms0gf-0000uF-E8 for importer@patchew.org; Tue, 30 Nov 2021 05:48:37 -0500 Received: from eggs.gnu.org ([209.51.188.92]:43584) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ms0aK-0005gW-DJ for qemu-devel@nongnu.org; Tue, 30 Nov 2021 05:42:04 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:41300) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1ms0aI-000136-V5 for qemu-devel@nongnu.org; Tue, 30 Nov 2021 05:42:04 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-99-MatqU4wDPu-2YxpKyQUcNA-1; Tue, 30 Nov 2021 05:41:59 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id EA7ED192CC4A; Tue, 30 Nov 2021 10:41:57 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.193.9]) by smtp.corp.redhat.com (Postfix) with ESMTP id D4208101E592; Tue, 30 Nov 2021 10:41:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1638268922; h=from:from: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; bh=Wlt40QBQkDU6CaDYw9NJ1KuuNgpytHW2nxi1LfiTHfw=; b=aIRcbzClfHfWFSd+Eqc24sCwT1TkR2SeSVf72nF4Q1PhHWsvbPCC5aHxahTigsXCIcR9/Y GIDrvDAZzEl4BfLqNHoYPLCSGOeZzfoTrGHlToPMWhqg58BwZQ40ij7cUfRhkC1zv3bxdb gbxDO6pX8tHrdSG+hljFQ+EFcC+kn04= X-MC-Unique: MatqU4wDPu-2YxpKyQUcNA-1 From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v1 5/8] util/oslib-posix: Avoid creating a single thread with MADV_POPULATE_WRITE Date: Tue, 30 Nov 2021 11:41:33 +0100 Message-Id: <20211130104136.40927-6-david@redhat.com> In-Reply-To: <20211130104136.40927-1-david@redhat.com> References: <20211130104136.40927-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=david@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.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; Received-SPF: pass client-ip=170.10.129.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.716, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , Gavin Shan , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Eduardo Habkost , "Michael S. Tsirkin" , =?UTF-8?q?Michal=20Pr=C3=ADvozn=C3=ADk?= , David Hildenbrand , "Dr . David Alan Gilbert" , Pankaj Gupta , Sebastien Boeuf , Igor Mammedov , Paolo Bonzini , Hui Zhu Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1638269319922100001 Let's simplify the case when we only want a single thread and don't have to mess with signal handlers. Reviewed-by: Pankaj Gupta Reviewed-by: Daniel P. Berrang=C3=A9 Signed-off-by: David Hildenbrand --- util/oslib-posix.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/util/oslib-posix.c b/util/oslib-posix.c index 67c08a425e..efa4f96d56 100644 --- a/util/oslib-posix.c +++ b/util/oslib-posix.c @@ -564,6 +564,14 @@ static int touch_all_pages(char *area, size_t hpagesiz= e, size_t numpages, } =20 if (use_madv_populate_write) { + /* Avoid creating a single thread for MADV_POPULATE_WRITE */ + if (context.num_threads =3D=3D 1) { + if (qemu_madvise(area, hpagesize * numpages, + QEMU_MADV_POPULATE_WRITE)) { + return -errno; + } + return 0; + } touch_fn =3D do_madv_populate_write_pages; } else { touch_fn =3D do_touch_pages; --=20 2.31.1