Re: [PATCH 08/20] mm: Optimize fullmm TLB flushing

On Thu, 2012-06-28 at 18:20 +0200, Peter Zijlstra wrote:

Now the switch_mm should imply the same cache+TBL flush we'd otherwise
do, and I'd think that that would be the majority of the cost. Am I
wrong there? 

The advantage of doing this is that you don't need any of the batching
and possibly multiple invalidate nonsense you otherwise need. So it
might still be an over-all win, even if the switch is slightly more
expensive than a regular flush. Simply because you can avoid most (if
not all) the usual complexities.

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