linux-kernel - Re: [PATCH v7 0/5] AIO add per-command iopriority

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Date:   Tue, 22 May 2018 22:31:27 +0000
From:   Adam Manzanares <Adam.Manzanares@....com>
To:     Jens Axboe <axboe@...nel.dk>, Al Viro <viro@...IV.linux.org.uk>
CC:     "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "bcrl@...ck.org" <bcrl@...ck.org>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "kstewart@...uxfoundation.org" <kstewart@...uxfoundation.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "pombredanne@...b.com" <pombredanne@...b.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "bigeasy@...utronix.de" <bigeasy@...utronix.de>,
        "rgoldwyn@...e.com" <rgoldwyn@...e.com>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-aio@...ck.org" <linux-aio@...ck.org>,
        "linux-api@...r.kernel.org" <linux-api@...r.kernel.org>,
        "hch@...radread.org" <hch@...radread.org>,
        "jmoyer@...hat.com" <jmoyer@...hat.com>
Subject: Re: [PATCH v7 0/5] AIO add per-command iopriority



On 5/22/18 11:30 AM, Jens Axboe wrote:
> On 5/22/18 12:30 PM, Al Viro wrote:
>> On Tue, May 22, 2018 at 11:55:04AM -0600, Jens Axboe wrote:
>>> On 5/22/18 11:52 AM, adam.manzanares@....com wrote:
>>>> From: Adam Manzanares <adam.manzanares@....com>
>>>>
>>>> This is the per-I/O equivalent of the ioprio_set system call.
>>>> See the following link for performance implications on a SATA HDD:
>>>> https://lkml.org/lkml/2016/12/6/495
>>>>
>>>> First patch factors ioprio_check_cap function out of ioprio_set system call to
>>>> also be used by the aio ioprio interface.
>>>>
>>>> Second patch converts kiocb ki_hint field to a u16 to avoid kiocb bloat.
>>>>
>>>> Third patch passes ioprio hint from aio iocb to kiocb and initializes kiocb
>>>> ioprio value appropriately when it is not explicitly set.
>>>>
>>>> Fourth patch enables the feature for blkdev.
>>>>
>>>> Fifth patch enables the feature for iomap direct IO
>>>
>>> LGTM, you can add:
>>>
>>> Reviewed-by: Jens Axboe <axboe@...nel.dk>
>>>
>>> Al, are you picking this series up, or should I?
>>
>> Probably better if I do, once I finish reviewing Christoph's patchset -
>> we already have a bunch of stuff around fs/aio.c in this cycle...
> 
> Alright, sounds good, thanks Al.
> 

I was working on the man page update for this feature and noticed I 
could be bit more informative on error if I return the error value 
returned by ioprio_check_cap in fs/aio.c.

Should I resend the whole series?