Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)

At some point in the past, I wrote:
>> These IRQ stacks are per-cpu, not per-IRQ. It may make sense to
>> implement per-IRQ stacks, in which case dynamic allocation at the time
>> of request_irq() will make sense.

On Wed, May 02, 2007 at 12:07:45AM +0100, Alan Cox wrote:
> This depends if active IRQ count exceeds active CPU count worst cases.
> For the big boxes it might well do but for small ones we seem to be best
> with per CPU.

I'll leave IRQ stacks per-CPU, then. The prevailing opinion on large
i386 does not favor doing much of anything to accommodate it.


-- wli
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---

• References:
  • Re: [-mm patch] i386: enable 4k stacks by default
    • From: Christoph Hellwig <[email protected]>
  • Re: [-mm patch] i386: enable 4k stacks by default
    • From: Andi Kleen <[email protected]>
  • Re: [-mm patch] i386: enable 4k stacks by default
    • From: William Lee Irwin III <[email protected]>
  • [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: William Lee Irwin III <[email protected]>
  • Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: Christoph Hellwig <[email protected]>
  • Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: William Lee Irwin III <[email protected]>
  • Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: Christoph Hellwig <[email protected]>
  • Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: Matt Mackall <[email protected]>
  • Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: Bill Irwin <[email protected]>
  • Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default)
    • From: Alan Cox <[email protected]>

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