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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id BD88DC433EF for ; Thu, 9 Jun 2022 19:27:11 +0000 (UTC) Received: from localhost ([::1]:43014 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nzNoE-0006S8-Pc for qemu-devel@archiver.kernel.org; Thu, 09 Jun 2022 15:27:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:56316) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nzLro-0007t2-QL for qemu-devel@nongnu.org; Thu, 09 Jun 2022 13:22:44 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:49539) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nzLrd-0003fO-Vg for qemu-devel@nongnu.org; Thu, 09 Jun 2022 13:22:39 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1654795337; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qKURiMB5mXsc/snLL+3hfk33KA6vKCmW/7tv4A9nLyQ=; b=IB1Al5I4Bisp/JMFjy7siJZ21tKt3SRxORBjcQlXym5HYX/zlbpdshgxgOrb2DkjZZspTg pIBDRY6pPnn1kqLyArtW7QquPshF1BpzFGMZLZkVtiDROMbRPsXv5Na+czs/YAnAIWv7kQ wGNoFYAb/41/phOwsT1bCSWsbl8I0MM= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-645-4cbieJziO-6qrUMaibPWaw-1; Thu, 09 Jun 2022 13:22:16 -0400 X-MC-Unique: 4cbieJziO-6qrUMaibPWaw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 29C1A80A0AD; Thu, 9 Jun 2022 17:22:16 +0000 (UTC) Received: from merkur.redhat.com (unknown [10.39.195.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8A3A840D2827; Thu, 9 Jun 2022 17:22:15 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 04/18] block: improve block_dirty_bitmap_merge(): don't allocate extra bitmap Date: Thu, 9 Jun 2022 19:21:35 +0200 Message-Id: <20220609172149.293877-5-kwolf@redhat.com> In-Reply-To: <20220609172149.293877-1-kwolf@redhat.com> References: <20220609172149.293877-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.082, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Vladimir Sementsov-Ogievskiy We don't need extra bitmap. All we need is to backup the original bitmap when we do first merge. So, drop extra temporary bitmap and work directly with target and backup. Still to keep old semantics, that on failure target is unchanged and user don't need to restore, we need a local_backup variable and do restore ourselves on failure path. Signed-off-by: Vladimir Sementsov-Ogievskiy Message-Id: <20220517111206.23585-3-v.sementsov-og@mail.ru> Reviewed-by: Eric Blake Signed-off-by: Kevin Wolf --- block/monitor/bitmap-qmp-cmds.c | 41 +++++++++++++++++---------------- 1 file changed, 21 insertions(+), 20 deletions(-) diff --git a/block/monitor/bitmap-qmp-cmds.c b/block/monitor/bitmap-qmp-cmds.c index bd10468596..282363606f 100644 --- a/block/monitor/bitmap-qmp-cmds.c +++ b/block/monitor/bitmap-qmp-cmds.c @@ -261,8 +261,9 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, HBitmap **backup, Error **errp) { BlockDriverState *bs; - BdrvDirtyBitmap *dst, *src, *anon; + BdrvDirtyBitmap *dst, *src; BlockDirtyBitmapOrStrList *lst; + HBitmap *local_backup = NULL; GLOBAL_STATE_CODE(); @@ -271,12 +272,6 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, return NULL; } - anon = bdrv_create_dirty_bitmap(bs, bdrv_dirty_bitmap_granularity(dst), - NULL, errp); - if (!anon) { - return NULL; - } - for (lst = bms; lst; lst = lst->next) { switch (lst->value->type) { const char *name, *node; @@ -285,8 +280,7 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, src = bdrv_find_dirty_bitmap(bs, name); if (!src) { error_setg(errp, "Dirty bitmap '%s' not found", name); - dst = NULL; - goto out; + goto fail; } break; case QTYPE_QDICT: @@ -294,29 +288,36 @@ BdrvDirtyBitmap *block_dirty_bitmap_merge(const char *node, const char *target, name = lst->value->u.external.name; src = block_dirty_bitmap_lookup(node, name, NULL, errp); if (!src) { - dst = NULL; - goto out; + goto fail; } break; default: abort(); } - if (!bdrv_merge_dirty_bitmap(anon, src, NULL, errp)) { - dst = NULL; - goto out; + /* We do backup only for first merge operation */ + if (!bdrv_merge_dirty_bitmap(dst, src, + local_backup ? NULL : &local_backup, + errp)) + { + goto fail; } } - /* Merge into dst; dst is unchanged on failure. */ - if (!bdrv_merge_dirty_bitmap(dst, anon, backup, errp)) { - dst = NULL; - goto out; + if (backup) { + *backup = local_backup; + } else { + hbitmap_free(local_backup); } - out: - bdrv_release_dirty_bitmap(anon); return dst; + +fail: + if (local_backup) { + bdrv_restore_dirty_bitmap(dst, local_backup); + } + + return NULL; } void qmp_block_dirty_bitmap_merge(const char *node, const char *target, -- 2.35.3