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Re: [Qemu-devel] [PATCH v6 11/25] replay: implement replay-seek command
From: |
Markus Armbruster |
Subject: |
Re: [Qemu-devel] [PATCH v6 11/25] replay: implement replay-seek command to proceed to the desired step |
Date: |
Fri, 21 Sep 2018 17:00:51 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Pavel Dovgalyuk <address@hidden> writes:
> This patch adds hmp/qmp commands replay_seek/replay-seek that proceed
> the execution to the specified step.
> The commands automatically loads nearest snapshot and replay the execution
> to find the desired step.
>
> Signed-off-by: Pavel Dovgalyuk <address@hidden>
>
> --
>
> v2:
> - renamed replay_seek qmp command into replay-seek
> (suggested by Eric Blake)
> ---
> hmp-commands.hx | 15 ++++++++
> hmp.h | 1 +
> qapi/misc.json | 16 ++++++++
> replay/replay-debugging.c | 89
> +++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 121 insertions(+)
>
> diff --git a/hmp-commands.hx b/hmp-commands.hx
> index aa0794e..8d4065b 100644
> --- a/hmp-commands.hx
> +++ b/hmp-commands.hx
> @@ -1903,6 +1903,21 @@ Execution stops when the specified step is reached.
> ETEXI
>
> {
> + .name = "replay_seek",
> + .args_type = "step:i",
> + .params = "step",
> + .help = "rewinds replay to the specified step",
> + .cmd = hmp_replay_seek,
> + },
> +
> +STEXI
> address@hidden replay_seek @var{step}
> address@hidden replay_seek
> +Automatically proceeds to the specified step, when replaying
> +the execution.
Drop the comma (I think).
> +ETEXI
> +
> + {
> .name = "info",
> .args_type = "item:s?",
> .params = "[subcommand]",
> diff --git a/hmp.h b/hmp.h
> index ad94abe..a7d3bce 100644
> --- a/hmp.h
> +++ b/hmp.h
> @@ -150,5 +150,6 @@ void hmp_info_memory_size_summary(Monitor *mon, const
> QDict *qdict);
> void hmp_info_sev(Monitor *mon, const QDict *qdict);
> void hmp_info_replay(Monitor *mon, const QDict *qdict);
> void hmp_replay_break(Monitor *mon, const QDict *qdict);
> +void hmp_replay_seek(Monitor *mon, const QDict *qdict);
>
> #endif
> diff --git a/qapi/misc.json b/qapi/misc.json
> index 4fcd211..7389cc6 100644
> --- a/qapi/misc.json
> +++ b/qapi/misc.json
> @@ -3152,6 +3152,22 @@
> { 'command': 'replay-break', 'data': { 'step': 'int' } }
>
> ##
> +# @replay-seek:
> +#
> +# Automatically proceeds to the specified step, when replaying
> +# the execution.
> +#
> +# @step: destination execution step
> +#
> +# Since: 3.1
> +#
> +# Example:
> +#
> +# -> { "execute": "replay-seek", "data": { "step": 220414 } }
> +##
> +{ 'command': 'replay-seek', 'data': { 'step': 'int' } }
> +
> +##
> # @xen-load-devices-state:
> #
> # Load the state of all devices from file. The RAM and the block devices
> diff --git a/replay/replay-debugging.c b/replay/replay-debugging.c
> index c6b80c0..e605ee0 100644
> --- a/replay/replay-debugging.c
> +++ b/replay/replay-debugging.c
> @@ -18,6 +18,8 @@
> #include "qapi/qapi-commands-misc.h"
> #include "qapi/qmp/qdict.h"
> #include "qemu/timer.h"
> +#include "block/snapshot.h"
> +#include "migration/snapshot.h"
>
> void hmp_info_replay(Monitor *mon, const QDict *qdict)
> {
> @@ -94,3 +96,90 @@ void hmp_replay_break(Monitor *mon, const QDict *qdict)
> return;
> }
> }
> +
> +static char *replay_find_nearest_snapshot(int64_t step, int64_t*
> snapshot_step)
> +{
> + BlockDriverState *bs;
> + QEMUSnapshotInfo *sn_tab;
> + QEMUSnapshotInfo *nearest = NULL;
> + char *ret = NULL;
> + int nb_sns, i;
> + AioContext *aio_context;
> +
> + *snapshot_step = -1;
> +
> + bs = bdrv_all_find_vmstate_bs();
> + if (!bs) {
> + goto fail;
> + }
> + aio_context = bdrv_get_aio_context(bs);
> +
> + aio_context_acquire(aio_context);
> + nb_sns = bdrv_snapshot_list(bs, &sn_tab);
> + aio_context_release(aio_context);
> +
> + for (i = 0; i < nb_sns; i++) {
> + if (bdrv_all_find_snapshot(sn_tab[i].name, &bs) == 0) {
> + if (sn_tab[i].icount != -1ULL
> + && sn_tab[i].icount <= step
> + && (!nearest || nearest->icount < sn_tab[i].icount)) {
> + nearest = &sn_tab[i];
> + }
> + }
> + }
> + if (nearest) {
> + ret = g_strdup(nearest->name);
> + *snapshot_step = nearest->icount;
> + }
> + g_free(sn_tab);
> +
> +fail:
> + return ret;
> +}
> +
> +static void replay_seek(int64_t step, Error **errp, QEMUTimerCB callback)
By convention, Error **errp goes last.
> +{
> + char *snapshot = NULL;
Suggest blank line between declaration and statement.
> + if (replay_mode != REPLAY_MODE_PLAY) {
> + error_setg(errp, "replay must be enabled to seek");
> + return;
> + }
> + if (!replay_snapshot) {
> + error_setg(errp, "snapshotting is disabled");
> + return;
> + }
> + int64_t snapshot_step = -1;
Dead initialization.
Recommend to declare this variable at the beginning of the function.
> + snapshot = replay_find_nearest_snapshot(step, &snapshot_step);
> + if (snapshot) {
> + if (step < replay_get_current_step()
> + || replay_get_current_step() < snapshot_step) {
> + vm_stop(RUN_STATE_RESTORE_VM);
> + load_snapshot(snapshot, errp);
> + }
> + g_free(snapshot);
> + }
> + if (replay_get_current_step() <= step) {
> + replay_break(step, callback, NULL);
> + vm_start();
> + } else {
> + error_setg(errp, "cannot seek to the specified step");
> + }
> +}
> +
> +void qmp_replay_seek(int64_t step, Error **errp)
> +{
> + replay_seek(step, errp, replay_stop_vm);
> +}
> +
> +void hmp_replay_seek(Monitor *mon, const QDict *qdict)
> +{
> + int64_t step = qdict_get_try_int(qdict, "step", -1LL);
> + Error *err = NULL;
> +
> + qmp_replay_seek(step, &err);
> + if (err) {
> + monitor_printf(mon, "replay_seek error: %s\n",
> error_get_pretty(err));
> + error_free(err);
Same as for the previous patch's hmp_replay_break():
error_report_err(err);
> + return;
> + }
> +}
- [Qemu-devel] [PATCH v6 05/25] replay: finish record/replay before closing the disks, (continued)
- [Qemu-devel] [PATCH v6 05/25] replay: finish record/replay before closing the disks, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 06/25] qcow2: introduce icount field for snapshots, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 07/25] migration: introduce icount field for snapshots, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 08/25] replay: provide and accessor for rr filename, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 09/25] replay: introduce info hmp/qmp command, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 10/25] replay: introduce breakpoint at the specified step, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 11/25] replay: implement replay-seek command to proceed to the desired step, Pavel Dovgalyuk, 2018/09/12
- Re: [Qemu-devel] [PATCH v6 11/25] replay: implement replay-seek command to proceed to the desired step,
Markus Armbruster <=
- [Qemu-devel] [PATCH v6 14/25] translator: fix breakpoint processing, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 12/25] replay: flush events when exiting, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 15/25] replay: flush rr queue before loading the vmstate, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 13/25] replay: refine replay-time module, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 16/25] gdbstub: add reverse step support in replay mode, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 17/25] gdbstub: add reverse continue support in replay mode, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 18/25] replay: describe reverse debugging in docs/replay.txt, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 19/25] replay: allow loading any snapshots before recording, Pavel Dovgalyuk, 2018/09/12
- [Qemu-devel] [PATCH v6 20/25] replay: wake up vCPU when replaying, Pavel Dovgalyuk, 2018/09/12