Date: Sun, 28 Jan 2007 15:33:25 +0000
From: Christoph Hellwig <hch@infradead.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 0/7] breaking the global file_list_lock
Message-ID: <20070128153325.GC23410@infradead.org>
Mail-Followup-To: Christoph Hellwig <hch@infradead.org>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
	Ingo Molnar <mingo@elte.hu>
References: <20070128115118.837777000@programming.kicks-ass.net> <20070128144325.GB16552@infradead.org> <20070128151122.GA21159@infradead.org> <1169998144.10987.28.camel@lappy>
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On Sun, Jan 28, 2007 at 04:29:04PM +0100, Peter Zijlstra wrote:
> I shall pursue this direction. Thanks for the information.

Btw, if you need this short-term there might be an even simpler
solution:

  - all files go on sb->s_list and stay there until the file is freed
  - ttys grow their private list instead of beeing mixed up with the
    per-sb list

This already allows nice splitting of the locks into per-sb and per-tty
(although all tty_files accesses might be protected by tty_mutex anyway).
Especially for the superblock a rcu conversion might be quite easy
if nessecary, but all traversals are in what I'd consider more or less
slowpathes anyway.

> 
---end quoted text---
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