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Subject: Re: [PATCH] blk-mq: only run mapped hw queues in
 blk_mq_run_hw_queues()
From: Christian Borntraeger <borntraeger@de.ibm.com>
To: Ming Lei <ming.lei@redhat.com>
Cc: Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        Christoph Hellwig <hch@infradead.org>,
        Stefan Haberland <sth@linux.vnet.ibm.com>,
        Christoph Hellwig <hch@lst.de>
References: <20180328012035.17565-1-ming.lei@redhat.com>
 <ab28ea2a-9061-a4bb-723f-7db46d9a61c2@kernel.dk>
 <ebd41c63-5b64-23a7-1914-4abdedf3c9b2@de.ibm.com>
 <20180328152617.GA6071@ming.t460p>
 <19cb3f30-a2aa-5d3b-acad-95c882615929@de.ibm.com>
 <20180329020021.GA29317@ming.t460p>
 <b3f7e1b5-2de4-80d3-8125-c2a1da8ba9a6@de.ibm.com>
 <20180329095214.GB17190@ming.t460p>
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Date: Thu, 29 Mar 2018 12:12:27 +0200
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On 03/29/2018 12:11 PM, Christian Borntraeger wrote:
> 
> 
> On 03/29/2018 11:52 AM, Ming Lei wrote:
>> From the debugfs log, hctx0 is mapped to lots of CPU, so it shouldn't be
>> unmapped, could you check if it is hctx0 which is unmapped when the
>> warning is triggered? If not, what is the unmapped hctx? And you can do
>> that by adding one extra line:
>>
>> 	printk("unmapped hctx %d", hctx->queue_num);
> 
> Where do you want that printk?

And do you want it with or without the other patch that you have just sent?