From: Anssi Hannula anssi.hannula@bitwise.fi
[ 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: 9aa8b50b2b3d ("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 --- drivers/hv/hv_balloon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index bd4e72f6dfd4..44d6de6fc03d 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -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);
} }