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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A4ADC433EF for ; Mon, 4 Oct 2021 12:14:01 +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 BDB2B6113A for ; Mon, 4 Oct 2021 12:14:00 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org BDB2B6113A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=nongnu.org Received: from localhost ([::1]:46386 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1mXMr1-0001G9-TH for qemu-devel@archiver.kernel.org; Mon, 04 Oct 2021 08:13:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44650) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mXMia-0005Ly-Av for qemu-devel@nongnu.org; Mon, 04 Oct 2021 08:05:18 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:32382) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1mXMiU-0003eo-Ek for qemu-devel@nongnu.org; Mon, 04 Oct 2021 08:05:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1633349109; 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=YTlclzjMVa8FxCR8m/ZrTtMkPjbXRulQaZ6o5roo8ywid2pVpornY+5EMaMQCBCqaJZbRr FwBFK/b8+pOgUXCXhanRweRgJQgITwZ4aw9ygM9A/JO2ROYyFG0sVJcQj1Xv6mIcrLKPuL oXGxsQYvpuLwXFtSdcqICBvIhqMYiqM= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-162-r2EoFnMbMnaShP0FJpMUPQ-1; Mon, 04 Oct 2021 08:02:55 -0400 X-MC-Unique: r2EoFnMbMnaShP0FJpMUPQ-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A53101B18BCB; Mon, 4 Oct 2021 12:02:54 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.159]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0A2A819C59; Mon, 4 Oct 2021 12:02:51 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v4 5/7] util/oslib-posix: Avoid creating a single thread with MADV_POPULATE_WRITE Date: Mon, 4 Oct 2021 14:02:06 +0200 Message-Id: <20211004120208.7409-6-david@redhat.com> In-Reply-To: <20211004120208.7409-1-david@redhat.com> References: <20211004120208.7409-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 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: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=david@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -9 X-Spam_score: -1.0 X-Spam_bar: - X-Spam_report: (-1.0 / 5.0 requ) DKIMWL_WL_HIGH=-0.066, 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_H2=-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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pankaj Gupta , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= , Eduardo Habkost , "Michael S. Tsirkin" , David Hildenbrand , "Dr . David Alan Gilbert" , Pankaj Gupta , Igor Mammedov , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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. Berrangé 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 hpagesize, size_t numpages, } if (use_madv_populate_write) { + /* Avoid creating a single thread for MADV_POPULATE_WRITE */ + if (context.num_threads == 1) { + if (qemu_madvise(area, hpagesize * numpages, + QEMU_MADV_POPULATE_WRITE)) { + return -errno; + } + return 0; + } touch_fn = do_madv_populate_write_pages; } else { touch_fn = do_touch_pages; -- 2.31.1