From: "Aneesh Kumar K. V" <aneesh.kumar@linux.vnet.ibm.com>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: v9fs-developer@lists.sourceforge.net,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH -V1 0/7] Buffered write and writeable mmap support for 9P
Date: Tue, 01 Feb 2011 00:11:51 +0530 [thread overview]
Message-ID: <877hdk9aq8.fsf@linux.vnet.ibm.com> (raw)
In-Reply-To: <E1PjqD4-0000dZ-UN@pomaz-ex.szeredi.hu>
On Mon, 31 Jan 2011 10:38:10 +0100, Miklos Szeredi <miklos@szeredi.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
prev parent reply other threads:[~2011-01-31 18:41 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-29 19:26 [RFC PATCH -V1 0/7] Buffered write and writeable mmap support for 9P Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 1/7] fs/9p: set the cached file_operations struct during inode init Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 2/7] fs/9p: set fs cache cookie in create path also Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 3/7] fs/9p: increment inode->i_count in cached mode Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 4/7] fs/9p: [fscache] wait for page write " Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 5/7] fs/9p: Add read write helper function Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 6/7] fs/9p: Add fid to inode in cached mode Aneesh Kumar K.V
2011-01-29 19:26 ` [RFC PATCH -V1 7/7] fs/9p: Add buffered write support for v9fs. We can now support writeable mmaps Aneesh Kumar K.V
2011-01-31 9:38 ` [RFC PATCH -V1 0/7] Buffered write and writeable mmap support for 9P Miklos Szeredi
2011-01-31 18:41 ` Aneesh Kumar K. V [this message]
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