linux-kernel - [RFC] About 9pfs support "O

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Message-ID: <5ABDFB24.1080207@huawei.com>
Date:   Fri, 30 Mar 2018 16:53:56 +0800
From:   jiangyiwen <jiangyiwen@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Ron Minnich <rminnich@...dia.gov>,
        Latchesar Ionkov <lucho@...kov.net>,
        Greg Kurz <groug@...d.org>, <aneesh.kumar@...ux.vnet.ibm.com>
CC:     <linux-kernel@...r.kernel.org>,
        <v9fs-developer@...ts.sourceforge.net>, <qemu-devel@...gnu.org>
Subject: [RFC] About 9pfs support "O_DIRECT + aio"?

Hi everyone,

Currently, I found virtio-9p in VirtFS don't support "O_DIRECT + aio"
mode, both v9fs and qemu. So when user use "O_DIRECT + aio" mode and
increase iodepths, they can't get higher IOPS.

I want to know why v9fs don't implement this mode? And I will try to
implement this mode from now on.

Thanks,
Yiwen.