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Date: Thu, 25 Feb 2010 11:33:08 +0900
From: Tejun Heo <tj@kernel.org>
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To: Yinghai Lu <yinghai@kernel.org>
CC: Peter Zijlstra <peterz@infradead.org>, Ingo Molnar <mingo@elte.hu>,
       Christoph Lameter <cl@linux-foundation.org>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Stephen Rothwell <sfr@canb.auug.org.au>,
       Thomas Gleixner <tglx@linutronix.de>,
       Andrew Morton <akpm@linux-foundation.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>, linux-kernel@vger.kernel.org,
       linux-pci@vger.kernel.org, Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH 16/35] x86: make 64 bit use early_res instead of bootmem
 before slab
References: <1265793639-15071-1-git-send-email-yinghai@kernel.org>	 <1265793639-15071-17-git-send-email-yinghai@kernel.org>	 <20100215010833.15f9e09a.sfr@canb.auug.org.au>	 <4B7B4378.1070206@kernel.org> <1267052387.12790.10.camel@laptop> <4B85B65E.503@kernel.org> <4B85B724.9050304@kernel.org> <4B85DB79.4010708@kernel.org> <4B85DCAF.5030304@kernel.org>
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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