linux-kernel - Re: [PATCH UPDATED] percpu: use dynamic percpu allocator as the default percpu allocator

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Message-ID: <49D2B2DC.9000401@kernel.org>
Date:	Wed, 01 Apr 2009 09:18:36 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Christoph Lameter <cl@...ux.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	rusty@...tcorp.com.au, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, hpa@...or.com,
	Paul Mundt <lethal@...ux-sh.org>, rmk@....linux.org.uk,
	starvik@...s.com, ralf@...ux-mips.org, davem@...emloft.net,
	cooloney@...nel.org, kyle@...artin.ca, matthew@....cx,
	grundler@...isc-linux.org, takata@...ux-m32r.org,
	benh@...nel.crashing.org, rth@...ddle.net,
	ink@...assic.park.msu.ru, heiko.carstens@...ibm.com,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH UPDATED] percpu: use dynamic percpu allocator as the default
 percpu allocator

Hello,

Christoph Lameter wrote:
> Needs additional feedback and review by Tejun I would think. Just compile
> tested so far. The removal of the rbtree also relaxes locking restrictions
> for pcpu_chunk_address_search (which is not really searching anymore).
> 
> Subject: dynamic percpu allocator: Remove rbtree
> 
> The rbtree is used to determine the chunk from the virtual address. However,
> we can already determine the page struct from a virtual address and there
> are several unused fields in page struct used by vmalloc. Use the index
> field to store a pointer to the chunk. Then there is no need anymore for
> an rbtree.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>

This is great.  I'll integrate the patch and test it soonish but with
LSF on the next week, I'll probably be slow during the next two weeks.

Thanks a lot.

-- 
tejun
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