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hv_balloon: rate-limit "Unhandled message" warning 

[ Upstream commit 1d7286729aa616772be334eb908e11f527e1e291 ]

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 96d9d1fa5cd5
("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 c00a91aca2
commit 6f41e4a69b
1 changed files with 1 additions and 1 deletions
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2
drivers/hv/hv_balloon.c
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@ -1550,7 +1550,7 @@ static void balloon_onchannelcallback(void *context)
break;
default:
pr_warn("Unhandled message: type: %d\n", dm_hdr->type);
pr_warn_ratelimited("Unhandled message: type: %d\n", dm_hdr->type);
}
}