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

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Date:   Thu, 17 May 2018 20:41:32 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     adam.manzanares@....com, viro@...iv.linux.org.uk,
        linux-fsdevel@...r.kernel.org, bcrl@...ck.org
Cc:     mingo@...nel.org, peterz@...radead.org, pombredanne@...b.com,
        gregkh@...uxfoundation.org, bigeasy@...utronix.de,
        rgoldwyn@...e.com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-aio@...ck.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH v4 0/3] AIO add per-command iopriority

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.

-- 
Jens Axboe