From: Matthew Wilcox <matthew@wil.cx>
To: Anton Blanchard <anton@samba.org>
Cc: npiggin@kernel.dk, viro@zeniv.linux.org.uk,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Andi Kleen <andi@firstfloor.org>,
Tim Chen <tim.c.chen@linux.intel.com>
Subject: Re: vfsmount lock issues on very large ppc64 box
Date: Sat, 16 Jul 2011 19:04:28 -0600 [thread overview]
Message-ID: <20110717010427.GC5359@parisc-linux.org> (raw)
In-Reply-To: <20110717105027.53cc3ca4@kryten>
On Sun, Jul 17, 2011 at 10:50:27AM +1000, Anton Blanchard wrote:
> Looking closer, all of these calls are in pipefs and sockfs.
> Since we never mount either filesystem they never get a long term
> reference and we always end up in the very slow write brlock path
> that takes a lock for each online CPU.
>
> Here is a quick hack that takes a long term reference on pipefs
> and sockfs which fixes the problem. Any thoughts on how we should
> fix it properly?
I know Tim and Andi have been looking into this ... I forget what their
fix was though.
--
Matthew Wilcox Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours. We can't possibly take such
a retrograde step."
next prev parent reply other threads:[~2011-07-17 1:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-17 0:50 vfsmount lock issues on very large ppc64 box Anton Blanchard
2011-07-17 1:04 ` Matthew Wilcox [this message]
2011-07-17 8:46 ` Andi Kleen
2011-07-18 8:17 ` Eric Dumazet
2011-07-18 15:40 ` Christoph Hellwig
2011-07-18 15:51 ` Al Viro
2011-07-19 16:32 ` [Patch] VFS : mount lock scalability for files systems without mount point (WAS vfsmount lock issues on very large ppc64 box) Tim Chen
2011-07-21 20:40 ` Al Viro
2011-07-22 0:27 ` Tim Chen
2011-07-23 13:24 ` Christoph Hellwig
2011-07-25 22:39 ` Tim Chen
2011-07-25 22:51 ` Al Viro
2011-07-25 23:22 ` Tim Chen
2011-07-26 6:00 ` Eric Dumazet
2011-07-26 8:21 ` [PATCH] vfs: dont chain pipe/anon/socket on superblock s_inodes list Eric Dumazet
2011-07-26 9:03 ` Christoph Hellwig
2011-07-26 9:36 ` Eric Dumazet
2011-07-26 9:42 ` Christoph Hellwig
2011-07-26 10:43 ` Eric Dumazet
2011-07-26 11:49 ` Christoph Hellwig
2011-07-27 15:21 ` [PATCH] vfs: avoid taking locks if inode not in lists Eric Dumazet
2011-07-27 17:12 ` Andi Kleen
2011-07-27 20:44 ` Christoph Hellwig
2011-07-27 20:59 ` Andi Kleen
2011-07-27 21:01 ` Christoph Hellwig
2011-07-28 4:11 ` [PATCH] vfs: conditionally call inode_wb_list_del() Eric Dumazet
2011-07-28 4:41 ` [PATCH] vfs: avoid taking locks if inode not in lists Eric Dumazet
2011-07-28 4:55 ` [PATCH] vfs: avoid call to inode_lru_list_del() if possible Eric Dumazet
2011-07-18 16:41 ` vfsmount lock issues on very large ppc64 box Tim Chen
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