linux-kernel - Re: [PATCH 19/20] sparc64: use embedding percpu first chunk allocator

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Message-Id: <20090721.205419.251322907.davem@davemloft.net>
Date:	Tue, 21 Jul 2009 20:54:19 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	tj@...nel.org
Cc:	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com, benh@...nel.crashing.org, dhowells@...hat.com,
	npiggin@...e.de, JBeulich@...ell.com, cl@...ux-foundation.org,
	rusty@...tcorp.com.au, hpa@...or.com, tglx@...utronix.de,
	akpm@...ux-foundation.org, x86@...nel.org, andi@...stfloor.org
Subject: Re: [PATCH 19/20] sparc64: use embedding percpu first chunk
 allocator

From: Tejun Heo <tj@...nel.org>
Date: Tue, 21 Jul 2009 19:26:18 +0900

> sparc64 currently allocates a large page for each cpu and partially
> remap them into vmalloc area much like what lpage first chunk
> allocator did.  As a 4M page is used for each cpu, this results in
> very large unit size and also adds TLB pressure due to the double
> mapping of pages in the first chunk.
> 
> This patch converts sparc64 to use the embedding percpu first chunk
> allocator which now knows how to handle NUMA configurations.  This
> simplifies the code a lot, doesn't incur any extra TLB pressure and
> results in better utilization of address space.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>

Acked-by: David S. Miller <davem@...emloft.net>
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