linux-kernel - Re: [PATCH 16/35] x86: make 64 bit use early

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Message-ID: <4B85E164.1080104@kernel.org>
Date:	Thu, 25 Feb 2010 11:33:08 +0900
From:	Tejun Heo <tj@...nel.org>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Christoph Lameter <cl@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 16/35] x86: make 64 bit use early_res instead of bootmem
 before slab

Hello,

On 02/25/2010 11:13 AM, Yinghai Lu wrote:
> ok, will add free_early_partial to handle it.

Great.

> i got impression, when we are moving slab ealier.  you said that
> will check to make percpu setup to use slab allocator instead.

I don't recall exactly but it probably was 4k remapping everything
into vmalloc area and didn't need large contiguous area.  The problem
with the former approach was that it added a lot of extra TLB
pressure.  The current allocator avoids that by overlaying the static
percpu areas onto the linear address space which requires punching
holes in an contiguous area.

Thanks.

-- 
tejun
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