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hv_balloon: rate-limit "Unhandled message" warning

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[ Upstream commit 1d7286729a ]

For a couple of times I have encountered a situation where

  hv_balloon: Unhandled message: type: 12447

is being flooded over 1 million times per second with various values,
filling the log and consuming cycles, making debugging difficult.

Add rate limiting to the message.

Most other Hyper-V drivers already have similar rate limiting in their
message callbacks.

The cause of the floods in my case was probably fixed by 96d9d1fa5c
("Drivers: hv: balloon: account for vmbus packet header in
max_pkt_size").

Fixes: 9aa8b50b2b ("Drivers: hv: Add Hyper-V balloon driver")
Signed-off-by: Anssi Hannula <anssi.hannula@bitwise.fi>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/20220222141400.98160-1-anssi.hannula@bitwise.fi
Signed-off-by: Wei Liu <wei.liu@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Anssi Hannula
2022-02-22 16:14:00 +02:00
committed by Greg Kroah-Hartman
parent ba2c6e353b
commit f01e08083c
1 changed files with 1 additions and 1 deletions
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2
drivers/hv/hv_balloon.c
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@@ -1558,7 +1558,7 @@ static void balloon_onchannelcallback(void *context)
break; break;
default: default:
pr_warn("Unhandled message: type: %d\n", dm_hdr->type); pr_warn_ratelimited("Unhandled message: type: %d\n", dm_hdr->type);
} }
} }