linux-kernel - Re: [patch -mm] cpusets: add memory_slab

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Message-ID: <alpine.DEB.2.00.0903112248360.26210@chino.kir.corp.google.com>
Date:	Wed, 11 Mar 2009 22:51:12 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Paul Menage <menage@...gle.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch -mm] cpusets: add memory_slab_hardwall flag

On Wed, 11 Mar 2009, Paul E. McKenney wrote:

> Adding synchronize_rcu() into a fast path would certainly be a problem,
> but call_rcu() should be OK.  If the data structure is updated often
> (old elements removed and new elements added), then the cache misses
> from elements that were removed, went cache-cold, and then were added
> again could potentially cause trouble, but read-mostly data structures
> should be OK.
> 
> Or were you worried about some other aspect of RCU overhead?
> 

Thanks for looking at this, Paul.  My latest proposal actually replaces 
the need for the rcu with a per-task flag called PF_SLAB_HARDWALL (see 
http://marc.info/?l=linux-kernel&m=123665181400366).
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