Re: [PATCH for-next 3/9] RDMA/hns: Fix cpu stuck caused by printings during reset

Junxian Huang
2024-09-12T01:04:52Z

On 2024/9/11 21:25, Leon Romanovsky wrote:
> On Wed, Sep 11, 2024 at 09:34:19AM +0800, Junxian Huang wrote:
>>
>>
>> On 2024/9/10 21:09, Leon Romanovsky wrote:
>>> On Fri, Sep 06, 2024 at 05:34:38PM +0800, Junxian Huang wrote:
>>>> From: wenglianfa <wenglianfa@huawei.com>
>>>>
>>>> During reset, cmd to destroy resources such as qp, cq, and mr may
>>>> fail, and error logs will be printed. When a large number of
>>>> resources are destroyed, there will be lots of printings, and it
>>>> may lead to a cpu stuck. Replace the printing functions in these
>>>> paths with the ratelimited version.
>>>
>>> At lease some of them if not most should be deleted.
>>>
>>
>> Hi Leon,I wonder if there is a clear standard about whether printing
>> can be added?
>
> I don't think so, but there are some guidelines that can help you to do it:
> 1. Don't print error messages in the fast path.
> 2. Don't print error messages if other function down in the stack already
> printed it.
> 3. Don't print error messages if it is possible to trigger them from
> unprivileged user.
> ...
>

Thanks

>>
>> Thanks,
>> Junxian
>>
>>> Thanks