Re: [PATCH v1 07/11] x86: perf: intel_pt: Intel PT PMU driver

[Andi Kleen]

> So MAX_ORDER is 11, which gives us (11+12) 23bit or 8M max allocations, right?
> 
> Given this TOPA stuff is completely fucked in the first release, that's
> about all we can get it, right?
> 
> Now given you said 100s MB/s data rate for this itrace stuff, we're at
> ~0.1s traces. And that's in the very best case where we can actually get
> 8M.
> 
> Is that a workable amount

The PMI handler switches to a new buffer to allow longer traces
in memory.  It just costs one PMI.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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