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Message-ID: <43FDB55E.7090607@yahoo.com.au>
Date: Fri, 24 Feb 2006 00:15:10 +1100
From: Nick Piggin <nickpiggin@yahoo.com.au>
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To: Andi Kleen <ak@suse.de>
CC: Ingo Molnar <mingo@elte.hu>, Arjan van de Ven <arjan@intel.linux.com>,
       linux-kernel@vger.kernel.org, akpm@osdl.org
Subject: Re: [Patch 3/3] prepopulate/cache cleared pages
References: <1140686238.2972.30.camel@laptopd505.fenrus.org> <200602231041.00566.ak@suse.de> <20060223124152.GA4008@elte.hu> <200602231406.43899.ak@suse.de>
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Andi Kleen wrote:
> On Thursday 23 February 2006 13:41, Ingo Molnar wrote:
> 
> 
>>What Arjan did is quite nifty, as it moves the page clearing out from 
>>under the mmap_sem-held critical section.
> 
> 
> So that was the point not the rescheduling under lock? Or both?
> 
> BTW since it touches your area of work you could comment what
> you think about not using voluntary preempt points for fast sleep locks
> like I later proposed.
> 
> 
>>How that is achieved is really  
>>secondary, it's pretty clear that it could be done in some nicer way.
> 
> 
> Great we agree then.
> 

I'm worried about the situation where we allocate but don't use the
new page: it blows quite a bit of cache. Then, when we do get around
to using it, it will be cold(er).

Good to see someone trying to improve this area, though.

-- 
SUSE Labs, Novell Inc.
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