linux-kernel - Re: [PATCH v4 0/3] AIO add per-command iopriority

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Date:   Fri, 18 May 2018 15:03:06 +0000
From:   Adam Manzanares <Adam.Manzanares@....com>
To:     Jens Axboe <axboe@...nel.dk>,
        "viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "bcrl@...ck.org" <bcrl@...ck.org>
CC:     "mingo@...nel.org" <mingo@...nel.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>
Subject: Re: [PATCH v4 0/3] AIO add per-command iopriority



On 5/17/18 7:41 PM, Jens Axboe wrote:
> On 5/17/18 2:38 PM, 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 enables block_dev
>> usage of the per I/O ioprio feature.
>>
>> v2: merge patches
>>      use IOCB_FLAG_IOPRIO
>>      validate intended use with IOCB_IOPRIO
>>      add linux-api and linux-block to cc
>>
>> v3: add ioprio_check_cap function
>>      convert kiocb ki_hint to u16
>>      use ioprio_check_cap when adding ioprio to kiocb in aio.c
>>
>> v4: handle IOCB_IOPRIO in aio_prep_rw
>>      note patch 3 depends on patch 1 in commit msg
>>
>> Adam Manzanares (3):
>>    block: add ioprio_check_cap function
>>    fs: Convert kiocb rw_hint from enum to u16
>>    fs: Add aio iopriority support for block_dev
>>
>>   block/ioprio.c               | 22 ++++++++++++++++------
>>   fs/aio.c                     | 16 ++++++++++++++++
>>   fs/block_dev.c               |  2 ++
>>   include/linux/fs.h           | 17 +++++++++++++++--
>>   include/linux/ioprio.h       |  2 ++
>>   include/uapi/linux/aio_abi.h |  1 +
>>   6 files changed, 52 insertions(+), 8 deletions(-)
> 
> This looks fine to me now. I can pick up #1 for 4.18 - and 2+3 as well,
> unless someone else wants to take them.

Great, thanks Jens.

>