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

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Message-ID: <1FE6DD409037234FAB833C420AA843EC0177822B@orsmsx424.amr.corp.intel.com>
Date:	Mon, 2 Jun 2008 10:58:17 -0700
From:	"Luck, Tony" <tony.luck@...el.com>
To:	"Christoph Lameter" <clameter@....com>, <akpm@...ux-foundation.org>
Cc:	<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

> 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.

-Tony
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