linux-kernel - Re: [PATCH] SLUB use cmpxchg

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Date:	Tue, 28 Aug 2007 09:12:39 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com
Subject: Re: [PATCH] SLUB use cmpxchg_local

On Mon, 2007-08-27 at 15:15 -0700, Christoph Lameter wrote:
> Hmmmm. One wild idea would be to use a priority futex for the slab lock? 
> That would make the slow paths interrupt safe without requiring interrupt 
> disable? Does a futex fit into the page struct?

Very much puzzled at what you propose. in-kernel we use rt_mutex (has
PI) or mutex, futexes are user-space. (on -rt spinlock_t == mutex ==
rt_mutex)

Neither disable interrupts since they are sleeping locks.

That said, on -rt we do not need to disable interrupts in the allocators
because its a bug to call an allocator from raw irq context.


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