On 05/09/2011 09:26 PM, Andrew Morton wrote:
On Tue, 10 May 2011 02:05:17 +0200 Andi Kleen<andi@xxxxxxxxxxxxxx> wrote:
hm, which atomic ops are those? We shouldn't need buslocked operations
on UP.
Good point. I forgot they're patched out.
Then it's likely somewhat slower, but I doubt it's a significant
slowdown. Essentially it's just a few more if ()s
And presumably some more instruction cachelines here and there. It'll
be small, but 100*small == large. We can reduce the overhead to zero,
it's a question of how ugly the end result is.
More instruction cachelines, but fewer pointer dereferences
due to not looking up the lock all the time (if the root
anon_vma is the same).
I suspect that will balance out pretty well.
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