linux-kernel - Re: More problems in setup_pcpu

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Message-ID: <49D4679E.4020503@kernel.org>
Date:	Thu, 02 Apr 2009 16:22:06 +0900
From:	Tejun Heo <tj@...nel.org>
To:	David Miller <davem@...emloft.net>
CC:	linux-kernel@...r.kernel.org
Subject: Re: More problems in setup_pcpu_remap()

Hello, David.

David Miller wrote:
>>> Using 2MB per cpu is just rediculious, and really not even necessary.
>> The focus at the moment is using large page for the first chunk to
>> reduce pressure on TLB, not necessarily actually using 2MB for each
>> unit.
> 
> You'll get better TLB hit rates with my suggestion.
> 
> The idea is to carve up a 2MB page amongst consequetive cpus in
> the same NUMA node.
> 
> With hyperthreading these cpus will be sharing the TLB, so you'll
> get better TLB hit rates than the current code.

That sounds great.

> I'm going to do something like this on sparc64.  This x86 code is
> severely demotivating me, so I'll stop looking at it now :-)

Yeah, please go ahead and write severely motivating code.  I'll be
very motivated to apply it to x86.  :-)

Thanks.

-- 
tejun
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