linux-kernel - Re: [RFC] SLAB : NUMA cache_free_alien() very expensive because of virt_to

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Message-ID: <20070321024452.GA17532@one.firstfloor.org>
Date:	Wed, 21 Mar 2007 03:44:52 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <christoph@...eter.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Eric Dumazet <dada1@...mosbay.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] SLAB : NUMA cache_free_alien() very expensive because of virt_to_slab(objp); nodeid = slabp->nodeid;

> We usually use page_to_nid(). Sure this will determine the node the object 
> resides on. But this may not be the node on which the slab is tracked 
> since there may have been a fallback at alloc time.

How about your slab rewrite?  I assume it would make more sense to fix
such problems in that code instead of the old which is going to be replaced
at some point.

-Andi
> 
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