Re: [BUG] long freezes on thinkpad t60

[Linus Torvalds]

On Thu, 21 Jun 2007, Ingo Molnar wrote:
> 
> I can understand why no data is saved by this change: gcc is aligning 
> the next field to a natural boundary anyway and we dont really have 
> arrays of spinlocks (fortunately).

Actually, some data structures could well shrink.

Look at "struct task_struct", for example. Right now it has two spinlocks 
right next to each other (alloc_lock and pi_lock).

Other data structures may have things like bitfields etc.

But yeah, I'd not expect that to be very common, and in some cases you 
might have to re-order data structures to take advantage of better 
packing, and even then it's probably not all that noticeable.

> but this is certainly not something for 2.6.22, it's an early 2.6.23 
> matter i suspect.

Oh, absolutely.

		Linus
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