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

Andrew Morton <[email protected]> writes:

> On Mon, 07 Aug 2006 23:47:23 -0600
> [email protected] (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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---

• References:
  • [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    • From: [email protected] (Eric W. Biederman)
  • [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] x86_64: Make NR_IRQS configurable in Kconfig
    • From: Arjan van de Ven <[email protected]>
  • [PATCH] x86_64: Auto size the per cpu area.
    • From: [email protected] (Eric W. Biederman)
  • Re: [PATCH] x86_64: Auto size the per cpu area.
    • From: Andrew Morton <[email protected]>

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