From patchwork Wed May 23 06:50:22 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Dovgalyuk X-Patchwork-Id: 10420391 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D534D60327 for ; Wed, 23 May 2018 06:57:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C106E28EC5 for ; Wed, 23 May 2018 06:57:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B329028F96; Wed, 23 May 2018 06:57:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 0C04428EC5 for ; Wed, 23 May 2018 06:57:02 +0000 (UTC) Received: from localhost ([::1]:59540 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLNhl-0006VF-UJ for patchwork-qemu-devel@patchwork.kernel.org; Wed, 23 May 2018 02:57:02 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50193) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLNbL-0001Fp-O9 for qemu-devel@nongnu.org; Wed, 23 May 2018 02:50:25 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fLNbK-0000NO-56 for qemu-devel@nongnu.org; Wed, 23 May 2018 02:50:23 -0400 Received: from mail.ispras.ru ([83.149.199.45]:36202) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLNbJ-0000N8-GM for qemu-devel@nongnu.org; Wed, 23 May 2018 02:50:21 -0400 Received: from [127.0.1.1] (unknown [85.142.117.226]) by mail.ispras.ru (Postfix) with ESMTPSA id 7AAD9540394; Wed, 23 May 2018 09:50:20 +0300 (MSK) From: Pavel Dovgalyuk To: qemu-devel@nongnu.org Date: Wed, 23 May 2018 09:50:22 +0300 Message-ID: <20180523065022.26016.90099.stgit@pasha-VirtualBox> In-Reply-To: <20180523064941.26016.74274.stgit@pasha-VirtualBox> References: <20180523064941.26016.74274.stgit@pasha-VirtualBox> User-Agent: StGit/0.17.1-dirty MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [fuzzy] X-Received-From: 83.149.199.45 Subject: [Qemu-devel] [PATCH v3 07/19] migration: introduce icount field for snapshots 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: kwolf@redhat.com, peter.maydell@linaro.org, war2jordan@live.com, pavel.dovgaluk@ispras.ru, pbonzini@redhat.com, quintela@redhat.com, ciro.santilli@gmail.com, jasowang@redhat.com, crosthwaite.peter@gmail.com, zuban32s@gmail.com, armbru@redhat.com, maria.klimushenkova@ispras.ru, mst@redhat.com, kraxel@redhat.com, boost.lists@gmail.com, thomas.dullien@googlemail.com, dovgaluk@ispras.ru, mreitz@redhat.com, alex.bennee@linaro.org, dgilbert@redhat.com, rth@twiddle.net Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Saving icount as a parameters of the snapshot allows navigation between them in the execution replay scenario. This information can be used for finding a specific snapshot for rewinding the recorded execution to the specific moment of the time. E.g., 'reverse step' action needs to load the nearest snapshot which is prior to the current moment of time . Signed-off-by: Pavel Dovgalyuk --- v2: - made icount in SnapshotInfo optional (suggested by Eric Blake) --- block/qapi.c | 17 +++++++++++++---- block/qcow2-snapshot.c | 2 ++ blockdev.c | 10 ++++++++++ include/block/snapshot.h | 1 + migration/savevm.c | 5 +++++ qapi/block-core.json | 5 ++++- qapi/block.json | 3 ++- 7 files changed, 37 insertions(+), 6 deletions(-) diff --git a/block/qapi.c b/block/qapi.c index e12968f..a89e180 100644 --- a/block/qapi.c +++ b/block/qapi.c @@ -210,6 +210,7 @@ int bdrv_query_snapshot_info_list(BlockDriverState *bs, info->date_nsec = sn_tab[i].date_nsec; info->vm_clock_sec = sn_tab[i].vm_clock_nsec / 1000000000; info->vm_clock_nsec = sn_tab[i].vm_clock_nsec % 1000000000; + info->icount = sn_tab[i].icount; info_list = g_new0(SnapshotInfoList, 1); info_list->value = info; @@ -648,14 +649,15 @@ void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f, QEMUSnapshotInfo *sn) { char buf1[128], date_buf[128], clock_buf[128]; + char icount_buf[128] = {0}; struct tm tm; time_t ti; int64_t secs; if (!sn) { func_fprintf(f, - "%-10s%-20s%7s%20s%15s", - "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK"); + "%-10s%-18s%7s%20s%13s%11s", + "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK", "ICOUNT"); } else { ti = sn->date_sec; localtime_r(&ti, &tm); @@ -668,13 +670,18 @@ void bdrv_snapshot_dump(fprintf_function func_fprintf, void *f, (int)((secs / 60) % 60), (int)(secs % 60), (int)((sn->vm_clock_nsec / 1000000) % 1000)); + if (sn->icount != -1ULL) { + snprintf(icount_buf, sizeof(icount_buf), + "%"PRId64, sn->icount); + } func_fprintf(f, - "%-10s%-20s%7s%20s%15s", + "%-10s%-18s%7s%20s%13s%11s", sn->id_str, sn->name, get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size), date_buf, - clock_buf); + clock_buf, + icount_buf); } } @@ -842,6 +849,8 @@ void bdrv_image_info_dump(fprintf_function func_fprintf, void *f, .date_nsec = elem->value->date_nsec, .vm_clock_nsec = elem->value->vm_clock_sec * 1000000000ULL + elem->value->vm_clock_nsec, + .icount = elem->value->has_icount ? + elem->value->icount : -1ULL, }; pstrcpy(sn.id_str, sizeof(sn.id_str), elem->value->id); diff --git a/block/qcow2-snapshot.c b/block/qcow2-snapshot.c index d04553e..0af32c3 100644 --- a/block/qcow2-snapshot.c +++ b/block/qcow2-snapshot.c @@ -379,6 +379,7 @@ int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info) sn->date_sec = sn_info->date_sec; sn->date_nsec = sn_info->date_nsec; sn->vm_clock_nsec = sn_info->vm_clock_nsec; + sn->icount = sn_info->icount; /* Allocate the L1 table of the snapshot and copy the current one there. */ l1_table_offset = qcow2_alloc_clusters(bs, s->l1_size * sizeof(uint64_t)); @@ -698,6 +699,7 @@ int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) sn_info->date_sec = sn->date_sec; sn_info->date_nsec = sn->date_nsec; sn_info->vm_clock_nsec = sn->vm_clock_nsec; + sn_info->icount = sn->icount; } *psn_tab = sn_tab; return s->nb_snapshots; diff --git a/blockdev.c b/blockdev.c index 3808b1f..b965da6 100644 --- a/blockdev.c +++ b/blockdev.c @@ -56,6 +56,7 @@ #include "block/trace.h" #include "sysemu/arch_init.h" #include "sysemu/qtest.h" +#include "sysemu/replay.h" #include "qemu/cutils.h" #include "qemu/help_option.h" #include "qemu/throttle-options.h" @@ -1348,6 +1349,10 @@ SnapshotInfo *qmp_blockdev_snapshot_delete_internal_sync(const char *device, info->vm_state_size = sn.vm_state_size; info->vm_clock_nsec = sn.vm_clock_nsec % 1000000000; info->vm_clock_sec = sn.vm_clock_nsec / 1000000000; + if (sn.icount != -1ULL) { + info->icount = sn.icount; + info->has_icount = true; + } return info; @@ -1556,6 +1561,11 @@ static void internal_snapshot_prepare(BlkActionState *common, sn->date_sec = tv.tv_sec; sn->date_nsec = tv.tv_usec * 1000; sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (replay_mode != REPLAY_MODE_NONE) { + sn->icount = replay_get_current_step(); + } else { + sn->icount = -1ULL; + } ret1 = bdrv_snapshot_create(bs, sn); if (ret1 < 0) { diff --git a/include/block/snapshot.h b/include/block/snapshot.h index f73d109..c9c8975 100644 --- a/include/block/snapshot.h +++ b/include/block/snapshot.h @@ -42,6 +42,7 @@ typedef struct QEMUSnapshotInfo { uint32_t date_sec; /* UTC date of the snapshot */ uint32_t date_nsec; uint64_t vm_clock_nsec; /* VM clock relative to boot */ + uint64_t icount; /* record/replay step */ } QEMUSnapshotInfo; int bdrv_snapshot_find(BlockDriverState *bs, QEMUSnapshotInfo *sn_info, diff --git a/migration/savevm.c b/migration/savevm.c index 4251125..5c4747d 100644 --- a/migration/savevm.c +++ b/migration/savevm.c @@ -2457,6 +2457,11 @@ int save_snapshot(const char *name, Error **errp) sn->date_sec = tv.tv_sec; sn->date_nsec = tv.tv_usec * 1000; sn->vm_clock_nsec = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); + if (replay_mode != REPLAY_MODE_NONE) { + sn->icount = replay_get_current_step(); + } else { + sn->icount = -1ULL; + } if (name) { ret = bdrv_snapshot_find(bs, old_sn, name); diff --git a/qapi/block-core.json b/qapi/block-core.json index 55728cb..23b3ba6 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -25,13 +25,16 @@ # # @vm-clock-nsec: fractional part in nano seconds to be used with vm-clock-sec # +# @icount: current instruction count for execution record/replay (since 2.13) +# # Since: 1.3 # ## { 'struct': 'SnapshotInfo', 'data': { 'id': 'str', 'name': 'str', 'vm-state-size': 'int', 'date-sec': 'int', 'date-nsec': 'int', - 'vm-clock-sec': 'int', 'vm-clock-nsec': 'int' } } + 'vm-clock-sec': 'int', 'vm-clock-nsec': 'int', + '*icount': 'int' } } ## # @ImageInfoSpecificQCow2EncryptionBase: diff --git a/qapi/block.json b/qapi/block.json index c694524..2f364f7 100644 --- a/qapi/block.json +++ b/qapi/block.json @@ -148,7 +148,8 @@ # "date-sec": 1000012, # "date-nsec": 10, # "vm-clock-sec": 100, -# "vm-clock-nsec": 20 +# "vm-clock-nsec": 20, +# "icount": 220414 # } # } #