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Re: [PATCH] block-backend: per-device throttling of BLOCK_IO_ERROR repor
From: |
Markus Armbruster |
Subject: |
Re: [PATCH] block-backend: per-device throttling of BLOCK_IO_ERROR reports |
Date: |
Wed, 15 Nov 2023 14:46:15 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.2 (gnu/linux) |
Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> writes:
> From: Leonid Kaplan <xeor@yandex-team.ru>
>
> BLOCK_IO_ERROR events comes from guest, so we must throttle them.
Really? Can you describe how a guest can trigger these errors?
> We still want per-device throttling, so let's use device id as a key.
>
> Signed-off-by: Leonid Kaplan <xeor@yandex-team.ru>
> Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
> ---
> monitor/monitor.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/monitor/monitor.c b/monitor/monitor.c
> index 01ede1babd..ad0243e9d7 100644
> --- a/monitor/monitor.c
> +++ b/monitor/monitor.c
> @@ -309,6 +309,7 @@ int error_printf_unless_qmp(const char *fmt, ...)
> static MonitorQAPIEventConf monitor_qapi_event_conf[QAPI_EVENT__MAX] = {
> /* Limit guest-triggerable events to 1 per second */
> [QAPI_EVENT_RTC_CHANGE] = { 1000 * SCALE_MS },
> + [QAPI_EVENT_BLOCK_IO_ERROR] = { 1000 * SCALE_MS },
> [QAPI_EVENT_WATCHDOG] = { 1000 * SCALE_MS },
> [QAPI_EVENT_BALLOON_CHANGE] = { 1000 * SCALE_MS },
> [QAPI_EVENT_QUORUM_REPORT_BAD] = { 1000 * SCALE_MS },
> @@ -498,6 +499,10 @@ static unsigned int qapi_event_throttle_hash(const void
> *key)
> hash += g_str_hash(qdict_get_str(evstate->data, "qom-path"));
> }
>
> + if (evstate->event == QAPI_EVENT_BLOCK_IO_ERROR) {
> + hash += g_str_hash(qdict_get_str(evstate->data, "device"));
> + }
> +
> return hash;
> }
>
> @@ -525,6 +530,11 @@ static gboolean qapi_event_throttle_equal(const void *a,
> const void *b)
> qdict_get_str(evb->data, "qom-path"));
> }
>
> + if (eva->event == QAPI_EVENT_BLOCK_IO_ERROR) {
> + return !strcmp(qdict_get_str(eva->data, "device"),
> + qdict_get_str(evb->data, "device"));
> + }
> +
> return TRUE;
> }
Missing:
diff --git a/qapi/block-core.json b/qapi/block-core.json
index ca390c5700..32c2c2f030 100644
--- a/qapi/block-core.json
+++ b/qapi/block-core.json
@@ -5559,6 +5559,8 @@
# Note: If action is "stop", a STOP event will eventually follow the
# BLOCK_IO_ERROR event
#
+# Note: This event is rate-limited.
+#
# Since: 0.13
#
# Example: