linux-kernel - Re: [RFC PATCH -V1 0/7] Buffered write and writeable mmap support for 9P

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Date:	Tue, 01 Feb 2011 00:11:51 +0530
From:	"Aneesh Kumar K. V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	v9fs-developer@...ts.sourceforge.net,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH -V1 0/7] Buffered write and writeable mmap support for 9P

On Mon, 31 Jan 2011 10:38:10 +0100, Miklos Szeredi <miklos@...redi.hu> wrote:
> On Sun, 30 Jan 2011, Aneesh Kumar K.V wrote:
> > The patch series implement buffered write and writeable mmap for 9P
> 
> P9 is supposed to work with servers on the local machine, right?

Yes

> 
> In that case you need to think about various deadlock scenarios.  An
> example: the P9 server needs a large order allocation while serving
> the buffered write request.  That may trigger the page reclaim and go
> into synchronous writeback, possibly waiting on the exact page which
> the P9 server is just trying to finish writing out.
> 
> This is not easy to deal with, see commit 3be5a52b for the fuse
> solution.  I'm not saying it's the only way, there may be a better
> one.
> 

Thanks for the commit info. I will look at the details and see how best
we can solve this in 9P

-aneesh
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