From: Jens Axboe <axboe@kernel.dk>
To: Andrey Kuzmin <andrey.v.kuzmin@gmail.com>
Cc: fio@vger.kernel.org
Subject: Re: [PATCH]: Let I/O engine provide methods to allocate/free I/O memory.
Date: Tue, 23 Feb 2016 15:04:40 -0700 [thread overview]
Message-ID: <56CCD778.9070701@kernel.dk> (raw)
In-Reply-To: <CANvN+e=DNFrp6j4+nAtm84BWZn7u-eWqbFWM0fFMLFd-B+Lx3g@mail.gmail.com>
On 02/23/2016 03:02 PM, Andrey Kuzmin wrote:
>
> On Feb 24, 2016 00:57, "Jens Axboe" <axboe@kernel.dk
> <mailto:axboe@kernel.dk>> wrote:
> >
> > On 02/23/2016 02:16 PM, Andrey Kuzmin wrote:
> >>
> >> I/O engine may have special needs as to how the I/O memory should be
> >> allocated. The below patch adds respective methods to the I/O engine
> >> interface.
> >
> >
> > What kind of special needs? It's not that I mind adding an IO engine
> alloc hook, the only issue is that it potentially voids the various job
> file settings for memory backing etc without the user knowing it. So I
> think we need some decent justification here, other than "special needs" :-)
> >
>
> My engine talks directly to the hardware, and has to comply with the
> hardware requirements re the io memory. Is that enough justification ;)?
Maybe :-)
What are those requirements? Is it just alignment?
--
Jens Axboe
prev parent reply other threads:[~2016-02-23 22:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-23 21:16 [PATCH]: Let I/O engine provide methods to allocate/free I/O memory Andrey Kuzmin
2016-02-23 21:57 ` Jens Axboe
2016-02-23 22:02 ` Andrey Kuzmin
2016-02-23 22:04 ` Jens Axboe [this message]
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