linux-kernel - Re: your mail

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Message-ID: <20190320170321.GA27462@localhost.localdomain>
Date:   Wed, 20 Mar 2019 11:03:22 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Maxim Levitsky <mlevitsk@...hat.com>
Cc:     Fam Zheng <fam@...hon.net>, Keith Busch <keith.busch@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>, kvm@...r.kernel.org,
        Wolfram Sang <wsa@...-dreams.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Liang Cunming <cunming.liang@...el.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        linux-kernel@...r.kernel.org, linux-nvme@...ts.infradead.org,
        "David S . Miller" <davem@...emloft.net>,
        Jens Axboe <axboe@...com>,
        Alex Williamson <alex.williamson@...hat.com>,
        Kirti Wankhede <kwankhede@...dia.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Liu Changpeng <changpeng.liu@...el.com>,
        "Paul E . McKenney" <paulmck@...ux.ibm.com>,
        Amnon Ilan <ailan@...hat.com>, Christoph Hellwig <hch@....de>,
        John Ferlan <jferlan@...hat.com>
Subject: Re: your mail

On Wed, Mar 20, 2019 at 06:30:29PM +0200, Maxim Levitsky wrote:
> Or instead I can use the block backend, 
> (but note that currently the block back-end doesn't support polling which is
> critical for the performance).

Oh, I think you can do polling through there. For reference, fs/io_uring.c
has a pretty good implementation that aligns with how you could use it.