Re: [PATCH v2 07/18] block: introduce duration-limits priority class

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On 1/17/23 17:13, Christoph Hellwig wrote:
> On Tue, Jan 17, 2023 at 05:06:52PM +0900, Damien Le Moal wrote:
>> They can, by using a large limit for "low priority" IOs. But then, these
>> would still have a limit while any IO issued simultaneously without a CDL
>> index specified would have no limit at all. So strictly speaking, the no
>> limit IOs should be considered as even lower priority that CDL IOs with
>> large limits.
>>
>> The other aspect here is that on ATA drives, CDL and NCQ priority cannot
>> be used together. A mix of CDL and high priority commands cannot be sent
>> to a device. Combining this with the above thinking, it made sense to me
>> to have the CDL priority class handled the same as the RT class (as that
>> is the one that maps to ATA NCQ high prio commands).
> 
> Ok.  Maybe document this a bit better in the commit log.

OK. Will do.

-- 
Damien Le Moal
Western Digital Research




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