linux-kernel - Re: What was the problem with quicklists and x86-64?

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Date:	Fri, 14 Dec 2007 10:10:30 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Andi Kleen <ak@...e.de>,
	Tony Luck <tony.luck@...el.com>,
	Asit Mallick <asit.k.mallick@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: What was the problem with quicklists and x86-64?


On Thu, 2007-12-13 at 14:36 -0800, Christoph Lameter wrote:
> On Fri, 14 Dec 2007, Benjamin Herrenschmidt wrote:
> 
> > > No this may mean that the problem does not exist on powerpc since it 
> > > seems to be okay to free pages before all processors have flushed the 
> > > TLBs? Or are you deferrring the freeing of the pages via RCU?
> > 
> > I'm deferring the freeing with RCU.
> 
> The deferral works on a page level or for the whole list of pages that 
> have been gathered?

We have a separate batch to store page table pages with an RCU head on
it, we fire it off when it's full or when tlb gather is complete.

Ben.

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