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

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Date:	Fri, 14 Dec 2007 10:19:28 +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 15:14 -0800, Christoph Lameter wrote:
> On Fri, 14 Dec 2007, Benjamin Herrenschmidt wrote:
> 
> > 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.
> 
> full? You need to wait otill the tlb gather is complete.

No, we fire it off with RCU, we don't need to wait for TLB gather to be
complete. All we care about is sync with other CPUs doing a page table
walk and it's enough for us. We do -not- need to synchronize with TLB
invalidations and we don't use IPIs for those anyway.

Ben.


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