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 X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9ABFFC43613 for ; Thu, 20 Jun 2019 01:26:37 +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 7244C2084B for ; Thu, 20 Jun 2019 01:26:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7244C2084B Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:43002 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdlqW-0004wr-NK for qemu-devel@archiver.kernel.org; Wed, 19 Jun 2019 21:26:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:40681) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdle7-0002Dv-8O for qemu-devel@nongnu.org; Wed, 19 Jun 2019 21:13:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hdlUp-0004qK-M3 for qemu-devel@nongnu.org; Wed, 19 Jun 2019 21:04:12 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40280) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hdlUo-0004oJ-Av; Wed, 19 Jun 2019 21:04:10 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id 8FB5930C31B4; Thu, 20 Jun 2019 01:04:09 +0000 (UTC) Received: from probe.bos.redhat.com (dhcp-17-164.bos.redhat.com [10.18.17.164]) by smtp.corp.redhat.com (Postfix) with ESMTP id 75CD21001E67; Thu, 20 Jun 2019 01:04:08 +0000 (UTC) From: John Snow To: qemu-devel@nongnu.org, qemu-block@nongnu.org Date: Wed, 19 Jun 2019 21:03:49 -0400 Message-Id: <20190620010356.19164-6-jsnow@redhat.com> In-Reply-To: <20190620010356.19164-1-jsnow@redhat.com> References: <20190620010356.19164-1-jsnow@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.40]); Thu, 20 Jun 2019 01:04:09 +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 05/12] hbitmap: enable merging across granularities 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: Kevin Wolf , Fam Zheng , vsementsov@virtuozzo.com, Wen Congyang , Xie Changlong , Markus Armbruster , Max Reitz , John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: John Snow --- util/hbitmap.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/util/hbitmap.c b/util/hbitmap.c index 45d1725daf..0d6724b7bc 100644 --- a/util/hbitmap.c +++ b/util/hbitmap.c @@ -777,7 +777,17 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size) =20 bool hbitmap_can_merge(const HBitmap *a, const HBitmap *b) { - return (a->size =3D=3D b->size) && (a->granularity =3D=3D b->granula= rity); + return (a->size =3D=3D b->size); +} + +static void hbitmap_sparse_merge(HBitmap *dst, const HBitmap *src) +{ + uint64_t offset =3D 0; + uint64_t count =3D src->orig_size; + + while (hbitmap_next_dirty_area(src, &offset, &count)) { + hbitmap_set(dst, offset, count); + } } =20 /** @@ -804,6 +814,16 @@ bool hbitmap_merge(const HBitmap *a, const HBitmap *= b, HBitmap *result) return true; } =20 + if (a->size !=3D b->size) { + if (a !=3D result) { + hbitmap_sparse_merge(result, a); + } + if (b !=3D result) { + hbitmap_sparse_merge(result, b); + } + return true; + } + /* This merge is O(size), as BITS_PER_LONG and HBITMAP_LEVELS are co= nstant. * It may be possible to improve running times for sparsely populate= d maps * by using hbitmap_iter_next, but this is suboptimal for dense maps= . --=20 2.21.0