linux-kernel - Re: PREEMPT_RCU breaks anon

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Message-ID: <Pine.LNX.4.64.0702241612470.4891@schroedinger.engr.sgi.com>
Date:	Sat, 24 Feb 2007 16:13:47 -0800 (PST)
From:	Christoph Lameter <clameter@...r.sgi.com>
To:	Hugh Dickins <hugh@...itas.com>
cc:	Oleg Nesterov <oleg@...sign.ru>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	dipankar@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: PREEMPT_RCU breaks anon_vma locking ?

On Sat, 24 Feb 2007, Hugh Dickins wrote:

> Two, in his SLUB thread it sounds like he's toying with mixing up kmem
> caches of similar sizes: that seems a really bad idea to me (for reasons
> Andi and others have made) and I expect it'll get dropped; but in case
> not, let's note that the anon_vma cache is one which would fare very
> badly from getting mixed in with others (lock would no longer remain
> a lock, list would no longer remain a list, across that race).

Dont worry DESTROY_BY_RCU slabs wont be mixed with those not marked 
DESTROY_BY_RCU.
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