Re: [patch, 2.6.10-rc2] sched: fix ->nr_uninterruptible handlingbugs

[Linus Torvalds]

On Wed, 17 Nov 2004, Ingo Molnar wrote:
> 
> maybe, but why? Atomic ops are still a tad slower than normal ops

A "tad" slower? 

An atomic op is pretty much as expensive as a spinlock/unlock pair on x86.  
Not _quite_, but it's pretty close.

So yes, avoiding atomic ops is good if you can do it without any other 
real downsides (not having had time to check the patch yet, I won't do 
into that ;)

		Linus
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