From patchwork Thu Jun 20 01:03:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Snow X-Patchwork-Id: 1119083 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com 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 ozlabs.org (Postfix) with ESMTPS id 45TkfN20FCz9s5c for ; Thu, 20 Jun 2019 11:25:43 +1000 (AEST) Received: from localhost ([::1]:42994 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hdlpa-000408-Eb for incoming@patchwork.ozlabs.org; Wed, 19 Jun 2019 21:25:38 -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) 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+incoming=patchwork.ozlabs.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) bool hbitmap_can_merge(const HBitmap *a, const HBitmap *b) { - return (a->size == b->size) && (a->granularity == b->granularity); + return (a->size == b->size); +} + +static void hbitmap_sparse_merge(HBitmap *dst, const HBitmap *src) +{ + uint64_t offset = 0; + uint64_t count = src->orig_size; + + while (hbitmap_next_dirty_area(src, &offset, &count)) { + hbitmap_set(dst, offset, count); + } } /** @@ -804,6 +814,16 @@ bool hbitmap_merge(const HBitmap *a, const HBitmap *b, HBitmap *result) return true; } + if (a->size != b->size) { + if (a != result) { + hbitmap_sparse_merge(result, a); + } + if (b != result) { + hbitmap_sparse_merge(result, b); + } + return true; + } + /* This merge is O(size), as BITS_PER_LONG and HBITMAP_LEVELS are constant. * It may be possible to improve running times for sparsely populated maps * by using hbitmap_iter_next, but this is suboptimal for dense maps.