linux-kernel - Re: [RFC/PATCH] slab: free pages in a batch in drain

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Date:	Thu, 22 Feb 2007 15:01:30 -0800 (PST)
From:	Christoph Lameter <clameter@...r.sgi.com>
To:	Pekka J Enberg <penberg@...helsinki.fi>,
	Pekka Enberg <penberg@...helsinki.fi>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	wli@...omorphy.com
Subject: Re: [RFC/PATCH] slab: free pages in a batch in drain_freelist

On Thu, 22 Feb 2007, Pekka J Enberg wrote:

> As suggested by William, free the actual pages in a batch so that we
> don't keep pounding on l3->list_lock.

This means holding the l3->list_lock for a prolonged time period. The 
existing code was done this way in order to make sure that the interrupt 
holdoffs are minimal.

There is no pounding. The cacheline with the list_lock is typically held 
until the draining is complete. While we drain the freelist we need to be 
able to respond to interrupts.

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