Re: [RFC][PATCH 2/6] perf, arch: Rework perf_event_index()

From: Will Deacon
Date: Tue Nov 22 2011 - 06:54:13 EST


On Tue, Nov 22, 2011 at 11:51:50AM +0000, Peter Zijlstra wrote:
> On Tue, 2011-11-22 at 11:47 +0000, Will Deacon wrote:
>
> OK, I had interpreted your "we don't always have" to be slightly more
> common than just A15.

It was introduced for v7.1, of which the A15 is the first implementation. A7
and future cores should also have it (it's part of the architected timers
which are really needed for doing virtualisation properly).

Will
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