linux-kernel - Re: [PATCH 8/8] Add VM counters for transparent hugepages

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Message-Id: <20110308114159.7EAD.A69D9226@jp.fujitsu.com>
Date:	Tue,  8 Mar 2011 11:43:23 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	kosaki.motohiro@...fujitsu.com, Andi Kleen <andi@...stfloor.org>,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] Add VM counters for transparent hugepages

> > Don't we need to make per zone stastics? I'm afraid small dma zone 
> > makes much thp-splitting and screw up this stastics.
> 
> Does it? I haven't seen that so far.
> 
> If it happens a lot it would be better to disable THP for the 16MB DMA
> zone at least. Or did you mean the 4GB zone?

I assumered 4GB. And cpusets/mempolicy binding might makes similar 
issue. It can make only one zone high pressure.

But, hmmm...
Do you mean you don't hit any issue then? I don't think do don't tested
NUMA machine. So, it has  no practical problem I can agree this.

Thanks.



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