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Re: [Qemu-devel] [PATCH v9 04/10] replay: fix processing async events
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH v9 04/10] replay: fix processing async events |
Date: |
Thu, 4 May 2017 12:30:36 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 |
On 04/05/2017 10:41, Pavel Dovgalyuk wrote:
> From: Pavel Dovgalyuk <address@hidden>
>
> Asynchronous events saved at checkpoints may invoke
> callbacks when processed. These callbacks may also generate/read
> new events (e.g. clock reads). Therefore event processing flag must be
> reset before callback invocation.
>
> Signed-off-by: Pavel Dovgalyuk <address@hidden>
> ---
> replay/replay-events.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/replay/replay-events.c b/replay/replay-events.c
> index 94a6dcccfc..768b505f3d 100644
> --- a/replay/replay-events.c
> +++ b/replay/replay-events.c
> @@ -295,13 +295,13 @@ void replay_read_events(int checkpoint)
> if (!event) {
> break;
> }
> + replay_finish_event();
> + read_event_kind = -1;
> replay_mutex_unlock();
> replay_run_event(event);
> replay_mutex_lock();
>
> g_free(event);
> - replay_finish_event();
> - read_event_kind = -1;
While at it, g_free can be moved outside the lock.
Also, replay_flush_events and replay_save_events are leaving the event
in events_list while releasing the lock, and only doing QTAILQ_REMOVE
after taking it back. This can cause events to be processed twice.
I think it is worth fixing all of these.
Paolo
> }
> }
>
>
- [Qemu-devel] [PATCH v9 00/10] replay additions, Pavel Dovgalyuk, 2017/05/04
- [Qemu-devel] [PATCH v9 01/10] block: implement bdrv_snapshot_goto for blkreplay, Pavel Dovgalyuk, 2017/05/04
- [Qemu-devel] [PATCH v9 02/10] blkreplay: create temporary overlay for underlaying devices, Pavel Dovgalyuk, 2017/05/04
- [Qemu-devel] [PATCH v9 03/10] replay: disable default snapshot for record/replay, Pavel Dovgalyuk, 2017/05/04
- [Qemu-devel] [PATCH v9 04/10] replay: fix processing async events, Pavel Dovgalyuk, 2017/05/04
- Re: [Qemu-devel] [PATCH v9 04/10] replay: fix processing async events,
Paolo Bonzini <=
- [Qemu-devel] [PATCH v9 05/10] replay: fixed replay_enable_events, Pavel Dovgalyuk, 2017/05/04
- [Qemu-devel] [PATCH v9 06/10] replay: fix save/load vm for non-empty queue, Pavel Dovgalyuk, 2017/05/04