linux-kernel - Re: [patch 02/20] make the inode i_mmap

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Date:	Wed, 19 Dec 2007 20:28:23 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Lee Schermerhorn <Lee.Schermerhorn@...com>
Cc:	Rik van Riel <riel@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 02/20] make the inode i_mmap_lock a reader/writer lock


On Wed, 2007-12-19 at 11:53 -0500, Lee Schermerhorn wrote:
> On Wed, 2007-12-19 at 11:31 -0500, Rik van Riel wrote:
> > On Wed, 19 Dec 2007 10:52:09 -0500
> > Lee Schermerhorn <Lee.Schermerhorn@...com> wrote:
> > 
> > > I keep these patches up to date for testing.  I don't have conclusive
> > > evidence whether they alleviate or exacerbate the problem nor by how
> > > much.  
> > 
> > When the queued locking from Ingo's x86 tree hits mainline,
> > I suspect that spinlocks may end up behaving a lot nicer.
> 
> That would be worth testing with our problematic workloads...
> 
> > 
> > Should I drop the rwlock patches from my tree for now and
> > focus on just the page reclaim stuff?
> 
> That's fine with me.  They're out there is anyone is interested.  I'll
> keep them up to date in my tree [and hope they don't conflict with split
> lru and noreclaim patches too much] for occasional testing.

Of course, someone would need to implement ticket locks for ia64 -
preferably without the 256 cpu limit.

Nick, growing spinlock_t to 64 bits would yield space for 64k cpus,
right? I'm guessing that would be enough for a while, even for SGI.


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