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!
(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