On Wed, Oct 06, 2021 at 10:35:20AM +0100, German Gomez wrote:

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So simply say, I think the head pointer monotonically increasing is
the right thing to do in Arm SPE driver.

I will talk to James about how we can proceed on this.

Thanks!

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(note that the patch will skip the wrap-around detection if this is the
case,
in order to handle both cases in the userspace perf tool).

Almost agree, I read multiple times but have no idea what's the
"both cases" in the last sentence.

Apologies for the later part was not clear. What I meant to say was that
in the original patch for cs-etm, it seemed to handle both cases where
AUX head might be monotonically and non-monotonically increasing, so we
applied the same for the Arm SPE patch.

No worries, thanks for explanation.

Leo