linux-kernel - Re: [RFC PATCH 2/9] vringh: remove vringh_iov and unite to vringh

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Date:   Tue, 27 Dec 2022 02:56:04 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Shunsuke Mie <mie@...l.co.jp>
Cc:     Jason Wang <jasowang@...hat.com>,
        Rusty Russell <rusty@...tcorp.com.au>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/9] vringh: remove vringh_iov and unite to
 vringh_kiov

On Tue, Dec 27, 2022 at 04:13:49PM +0900, Shunsuke Mie wrote:
> 2022年12月27日(火) 16:05 Michael S. Tsirkin <mst@...hat.com>:
> >
> > On Tue, Dec 27, 2022 at 02:04:03PM +0800, Jason Wang wrote:
> > > On Tue, Dec 27, 2022 at 10:25 AM Shunsuke Mie <mie@...l.co.jp> wrote:
> > > >
> > > > struct vringh_iov is defined to hold userland addresses. However, to use
> > > > common function, __vring_iov, finally the vringh_iov converts to the
> > > > vringh_kiov with simple cast. It includes compile time check code to make
> > > > sure it can be cast correctly.
> > > >
> > > > To simplify the code, this patch removes the struct vringh_iov and unifies
> > > > APIs to struct vringh_kiov.
> > > >
> > > > Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
> > >
> > > While at this, I wonder if we need to go further, that is, switch to
> > > using an iov iterator instead of a vringh customized one.
> > >
> > > Thanks
> >
> > Possibly, but when doing changes like this one needs to be careful
> > to avoid breaking all the inlining tricks vringh relies on for
> > performance.
> Definitely, I'm evaluating the performance using vringh_test. I'll add a
> result of the evaluation. But, If there are other evaluation methods, could you
> please tell me?

high level tests over virtio blk and net are possible, but let's
start with vringh_test.

> > --
> > MST
> >
> 
> Best,
> Shunsuke