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Re: [PATCH v4 5/7] fs: prioritize and separate direct_io from dax_io

from [hch@xxxxxxxxxxxxx] [Permanent Link][Original]
To: "Verma, Vishal L" <vishal.l.verma@xxxxxxxxx>
Subject: Re: [PATCH v4 5/7] fs: prioritize and separate direct_io from dax_io
From: "hch@xxxxxxxxxxxxx" <hch@xxxxxxxxxxxxx>
Date: Sun, 8 May 2016 02:01:48 -0700
Cc: "hch@xxxxxxxxxxxxx" <hch@xxxxxxxxxxxxx>, "boaz@xxxxxxxxxxxxx" <boaz@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "linux-nvdimm@xxxxxxxxxxx" <linux-nvdimm@xxxxxxxxxxx>, "xfs@xxxxxxxxxxx" <xfs@xxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, "viro@xxxxxxxxxxxxxxxxxx" <viro@xxxxxxxxxxxxxxxxxx>, "akpm@xxxxxxxxxxxxxxxxxxxx" <akpm@xxxxxxxxxxxxxxxxxxxx>, "axboe@xxxxxx" <axboe@xxxxxx>, "linux-fsdevel@xxxxxxxxxxxxxxx" <linux-fsdevel@xxxxxxxxxxxxxxx>, "linux-ext4@xxxxxxxxxxxxxxx" <linux-ext4@xxxxxxxxxxxxxxx>, "david@xxxxxxxxxxxxx" <david@xxxxxxxxxxxxx>, "jack@xxxxxxx" <jack@xxxxxxx>, "matthew@xxxxxx" <matthew@xxxxxx>
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In-reply-to: <1462484343.29294.1.camel@xxxxxxxxx>
References: <1461878218-3844-1-git-send-email-vishal.l.verma@xxxxxxxxx> <1461878218-3844-6-git-send-email-vishal.l.verma@xxxxxxxxx> <5727753F.6090104@xxxxxxxxxxxxx> <20160505142433.GA4557@xxxxxxxxxxxxx> <1462484343.29294.1.camel@xxxxxxxxx>
User-agent: Mutt/1.5.24 (2015-08-30) 
On Thu, May 05, 2016 at 09:39:14PM +0000, Verma, Vishal L wrote:
> How is it any 'less direct'? All it does now is follow the blockdev
> O_DIRECT path. There still isn't any page cache involved..

It's still more overhead than the play DAX I/O path.
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