linux-kernel - Re: [PATCH] scsi: storvsc: Ratelimit warning logs to prevent VM denial of service

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Message-ID: <yq1bjwe748v.fsf@ca-mkp.ca.oracle.com>
Date: Fri, 10 Jan 2025 16:24:02 -0500
From: "Martin K. Petersen" <martin.petersen@...cle.com>
To: Easwar Hariharan <eahariha@...ux.microsoft.com>
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang
 <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>,
        Dexuan Cui
 <decui@...rosoft.com>,
        Long Li <longli@...ux.microsoft.com>, Long Li
 <longli@...rosoft.com>,
        "James E.J. Bottomley"
 <James.Bottomley@...senPartnership.com>,
        "Martin K. Petersen"
 <martin.petersen@...cle.com>,
        Mitchell Levy <levymitchell0@...il.com>,
        Mitchell Levy <mitchelllevy@...ux.microsoft.com>,
        linux-hyperv@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vijay Balakrishna
 <vijayb@...ux.microsoft.com>
Subject: Re: [PATCH] scsi: storvsc: Ratelimit warning logs to prevent VM
 denial of service


Easwar,

> If there's a persistent error in the hypervisor, the scsi warning for
> failed IO can flood the kernel log and max out CPU utilization,
> preventing troubleshooting from the VM side. Ratelimit the warning so
> it doesn't DOS the VM.

Applied to 6.14/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering