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Date: Tue, 19 Sep 2017 13:34:03 -0700
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: io_submit() blocks for writes for substantial amount of time
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To: Avi Kivity <avi@scylladb.com>
Cc: Christoph Hellwig <hch@infradead.org>, Brian Foster <bfoster@redhat.com>, Tomasz Grabiec <tgrabiec@scylladb.com>, linux-xfs@vger.kernel.org

On Tue, Sep 19, 2017 at 07:31:04PM +0300, Avi Kivity wrote:
> For DIO, does it really need the mm_struct? It can just pin the pages and
> pass them to the workqueue function.

We can't pin all the pages for a huge I/O at the same time.