linux-kernel - Re: [PATCH] x86_64: Auto size the per cpu area.

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Date:	Tue, 08 Aug 2006 00:31:06 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Andrew Morton <akpm@...l.org>
Cc:	Andi Kleen <ak@...e.de>, "Randy.Dunlap" <rdunlap@...otime.net>,
	"Protasevich, Natalie" <Natalie.Protasevich@...sys.com>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: [PATCH] x86_64:  Auto size the per cpu area.

Andrew Morton <akpm@...l.org> writes:

> On Mon, 07 Aug 2006 23:47:23 -0600
> ebiederm@...ssion.com (Eric W. Biederman) wrote:
>
>> +#ifdef CONFIG_MODULES
>> +# define PERCPU_MODULE_RESERVE 8192
>> +#else
>> +# define PERCPU_MODULE_RESERVE 0
>> +#endif
>> +
>> +#define PERCPU_ENOUGH_ROOM \
>> +	(ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES) + \
>> +	 PERCPU_MODULE_RESERVE)
>> +
>
> Seems sane, but isn't 8192 a bit small?

By my measure 8K is about 1/2KB less than what we have free in
2.6.18-rc3.  So it looks like a good initial guess to me.

Eric
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