linux-kernel - RE: [patch 01/41] cpu_alloc: Increase percpu area size to 128k

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Message-ID: <Pine.LNX.4.64.0806101022190.17093@schroedinger.engr.sgi.com>
Date:	Tue, 10 Jun 2008 10:22:42 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	"Luck, Tony" <tony.luck@...el.com>
cc:	akpm@...ux-foundation.org, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mike Travis <travis@....com>
Subject: RE: [patch 01/41] cpu_alloc: Increase percpu area size to 128k

On Mon, 2 Jun 2008, Luck, Tony wrote:

> > The per cpu allocator requires more per cpu space and we are already near
> > the limit on IA64. Increase the maximum size of the IA64 per cpu area from
> > 64K to 128K.
> 
> > -#define PERCPU_PAGE_SHIFT	16	/* log2() of max. size of per-CPU area */
> > +#define PERCPU_PAGE_SHIFT	17	/* log2() of max. size of per-CPU area */
> 
> Don't you need some more changes to the alt_dtlb_miss handler in
> ivt.S for this to work?  128K is not a supported pagesize on any
> processor model.

Ok so this needs to be 18?

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