linux-kernel - Re: [RFC] VFS: File System Mount Wide O

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Message-ID: <20120904105714.GA31020@infradead.org>
Date:	Tue, 4 Sep 2012 06:57:14 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Li Wang <liwang@...t.edu.cn>
Cc:	viro@...iv.linux.org.uk, axboe@...nel.dk,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] VFS: File System Mount Wide O_DIRECT Support

On Tue, Sep 04, 2012 at 06:17:47PM +0800, Li Wang wrote:
> For file system created on file-backed loop device, there will be two-levels of 
> page cache present, which typically doubles the memory consumption. 

And the right fix is to not use buffer I/O on the backing file instead
of hacks like this.

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