From nobody Tue Feb 10 05:44:11 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 151665981142417.061989800709057; Mon, 22 Jan 2018 14:23:31 -0800 (PST) Received: from localhost ([::1]:42021 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1edkUy-0000rm-Ns for importer@patchew.org; Mon, 22 Jan 2018 17:23:28 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:55890) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1edkHz-0006zn-7B for qemu-devel@nongnu.org; Mon, 22 Jan 2018 17:10:04 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1edkHx-0003zE-Pk for qemu-devel@nongnu.org; Mon, 22 Jan 2018 17:10:03 -0500 Received: from mx1.redhat.com ([209.132.183.28]:42330) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1edkHs-0003ux-Ko; Mon, 22 Jan 2018 17:09:56 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DD41DC04AC60; Mon, 22 Jan 2018 22:09:55 +0000 (UTC) Received: from localhost (ovpn-204-78.brq.redhat.com [10.40.204.78]) by smtp.corp.redhat.com (Postfix) with ESMTPS id B405C619F6; Mon, 22 Jan 2018 22:09:38 +0000 (UTC) From: Max Reitz To: qemu-block@nongnu.org Date: Mon, 22 Jan 2018 23:08:00 +0100 Message-Id: <20180122220806.22154-11-mreitz@redhat.com> In-Reply-To: <20180122220806.22154-1-mreitz@redhat.com> References: <20180122220806.22154-1-mreitz@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Mon, 22 Jan 2018 22:09:55 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v2 10/16] hbitmap: Add @advance param to hbitmap_iter_next() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Fam Zheng , qemu-devel@nongnu.org, Max Reitz , Stefan Hajnoczi , John Snow Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This new parameter allows the caller to just query the next dirty position without moving the iterator. Signed-off-by: Max Reitz --- include/qemu/hbitmap.h | 5 ++++- block/backup.c | 2 +- block/dirty-bitmap.c | 2 +- tests/test-hbitmap.c | 26 +++++++++++++------------- util/hbitmap.c | 10 +++++++--- 5 files changed, 26 insertions(+), 19 deletions(-) diff --git a/include/qemu/hbitmap.h b/include/qemu/hbitmap.h index 6b6490ecad..ddca52c48e 100644 --- a/include/qemu/hbitmap.h +++ b/include/qemu/hbitmap.h @@ -324,11 +324,14 @@ void hbitmap_free_meta(HBitmap *hb); /** * hbitmap_iter_next: * @hbi: HBitmapIter to operate on. + * @advance: If true, advance the iterator. Otherwise, the next call + * of this function will return the same result (if that + * position is still dirty). * * Return the next bit that is set in @hbi's associated HBitmap, * or -1 if all remaining bits are zero. */ -int64_t hbitmap_iter_next(HBitmapIter *hbi); +int64_t hbitmap_iter_next(HBitmapIter *hbi, bool advance); =20 /** * hbitmap_iter_next_word: diff --git a/block/backup.c b/block/backup.c index 4a16a37229..c083ce0deb 100644 --- a/block/backup.c +++ b/block/backup.c @@ -368,7 +368,7 @@ static int coroutine_fn backup_run_incremental(BackupBl= ockJob *job) HBitmapIter hbi; =20 hbitmap_iter_init(&hbi, job->copy_bitmap, 0); - while ((cluster =3D hbitmap_iter_next(&hbi)) !=3D -1) { + while ((cluster =3D hbitmap_iter_next(&hbi, true)) !=3D -1) { do { if (yield_and_check(job)) { return 0; diff --git a/block/dirty-bitmap.c b/block/dirty-bitmap.c index 7879d13ddb..50564fa1e2 100644 --- a/block/dirty-bitmap.c +++ b/block/dirty-bitmap.c @@ -498,7 +498,7 @@ void bdrv_dirty_iter_free(BdrvDirtyBitmapIter *iter) =20 int64_t bdrv_dirty_iter_next(BdrvDirtyBitmapIter *iter) { - return hbitmap_iter_next(&iter->hbi); + return hbitmap_iter_next(&iter->hbi, true); } =20 /* Called within bdrv_dirty_bitmap_lock..unlock */ diff --git a/tests/test-hbitmap.c b/tests/test-hbitmap.c index 9091c639b3..2a2aa5bd43 100644 --- a/tests/test-hbitmap.c +++ b/tests/test-hbitmap.c @@ -46,7 +46,7 @@ static void hbitmap_test_check(TestHBitmapData *data, =20 i =3D first; for (;;) { - next =3D hbitmap_iter_next(&hbi); + next =3D hbitmap_iter_next(&hbi, true); if (next < 0) { next =3D data->size; } @@ -435,25 +435,25 @@ static void test_hbitmap_iter_granularity(TestHBitmap= Data *data, /* Note that hbitmap_test_check has to be invoked manually in this tes= t. */ hbitmap_test_init(data, 131072 << 7, 7); hbitmap_iter_init(&hbi, data->hb, 0); - g_assert_cmpint(hbitmap_iter_next(&hbi), <, 0); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), <, 0); =20 hbitmap_test_set(data, ((L2 + L1 + 1) << 7) + 8, 8); hbitmap_iter_init(&hbi, data->hb, 0); - g_assert_cmpint(hbitmap_iter_next(&hbi), =3D=3D, (L2 + L1 + 1) << 7); - g_assert_cmpint(hbitmap_iter_next(&hbi), <, 0); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), =3D=3D, (L2 + L1 + 1) <= < 7); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), <, 0); =20 hbitmap_iter_init(&hbi, data->hb, (L2 + L1 + 2) << 7); - g_assert_cmpint(hbitmap_iter_next(&hbi), <, 0); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), <, 0); =20 hbitmap_test_set(data, (131072 << 7) - 8, 8); hbitmap_iter_init(&hbi, data->hb, 0); - g_assert_cmpint(hbitmap_iter_next(&hbi), =3D=3D, (L2 + L1 + 1) << 7); - g_assert_cmpint(hbitmap_iter_next(&hbi), =3D=3D, 131071 << 7); - g_assert_cmpint(hbitmap_iter_next(&hbi), <, 0); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), =3D=3D, (L2 + L1 + 1) <= < 7); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), =3D=3D, 131071 << 7); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), <, 0); =20 hbitmap_iter_init(&hbi, data->hb, (L2 + L1 + 2) << 7); - g_assert_cmpint(hbitmap_iter_next(&hbi), =3D=3D, 131071 << 7); - g_assert_cmpint(hbitmap_iter_next(&hbi), <, 0); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), =3D=3D, 131071 << 7); + g_assert_cmpint(hbitmap_iter_next(&hbi, true), <, 0); } =20 static void hbitmap_test_set_boundary_bits(TestHBitmapData *data, ssize_t = diff) @@ -893,7 +893,7 @@ static void test_hbitmap_serialize_zeroes(TestHBitmapDa= ta *data, for (i =3D 0; i < num_positions; i++) { hbitmap_deserialize_zeroes(data->hb, positions[i], min_l1, true); hbitmap_iter_init(&iter, data->hb, 0); - next =3D hbitmap_iter_next(&iter); + next =3D hbitmap_iter_next(&iter, true); if (i =3D=3D num_positions - 1) { g_assert_cmpint(next, =3D=3D, -1); } else { @@ -919,10 +919,10 @@ static void test_hbitmap_iter_and_reset(TestHBitmapDa= ta *data, =20 hbitmap_iter_init(&hbi, data->hb, BITS_PER_LONG - 1); =20 - hbitmap_iter_next(&hbi); + hbitmap_iter_next(&hbi, true); =20 hbitmap_reset_all(data->hb); - hbitmap_iter_next(&hbi); + hbitmap_iter_next(&hbi, true); } =20 static void test_hbitmap_next_zero_check(TestHBitmapData *data, int64_t st= art) diff --git a/util/hbitmap.c b/util/hbitmap.c index 289778a55c..ceb7b75bc6 100644 --- a/util/hbitmap.c +++ b/util/hbitmap.c @@ -141,7 +141,7 @@ unsigned long hbitmap_iter_skip_words(HBitmapIter *hbi) return cur; } =20 -int64_t hbitmap_iter_next(HBitmapIter *hbi) +int64_t hbitmap_iter_next(HBitmapIter *hbi, bool advance) { unsigned long cur =3D hbi->cur[HBITMAP_LEVELS - 1] & hbi->hb->levels[HBITMAP_LEVELS - 1][hbi->pos]; @@ -154,8 +154,12 @@ int64_t hbitmap_iter_next(HBitmapIter *hbi) } } =20 - /* The next call will resume work from the next bit. */ - hbi->cur[HBITMAP_LEVELS - 1] =3D cur & (cur - 1); + if (advance) { + /* The next call will resume work from the next bit. */ + hbi->cur[HBITMAP_LEVELS - 1] =3D cur & (cur - 1); + } else { + hbi->cur[HBITMAP_LEVELS - 1] =3D cur; + } item =3D ((uint64_t)hbi->pos << BITS_PER_LEVEL) + ctzl(cur); =20 return item << hbi->granularity; --=20 2.14.3