linux-kernel - Re: [patch]x86: spread tlb flush vector between nodes

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Message-ID: <1287537221.15980.3.camel@sli10-conroe.sh.intel.com>
Date:	Wed, 20 Oct 2010 09:13:41 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Chen, Tim C" <tim.c.chen@...el.com>
Subject: Re: [patch]x86: spread tlb flush vector between nodes

On Tue, 2010-10-19 at 21:34 +0800, Andi Kleen wrote:
> >  
> > +static int tlb_vector_offset[NR_CPUS] __read_mostly;
> 
> Never use NR_CPUS. Always use per cpu data.
> 
> Otherwise you waste a lot of space on a CONFIG_MAX_SMP
> kernel running on a smaller box.
ha, I want it to be __read_mostly to avoid cache pollution, apparently
we have no per cpu API to do this. Maybe I need add one.

Thanks,
Shaohua

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