Messages in this thread | | | Date | Mon, 17 Feb 2014 08:07:34 -0800 | From | Andi Kleen <> | Subject | Re: [PATCH v1 07/11] x86: perf: intel_pt: Intel PT PMU driver |
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> 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@linux.intel.com -- Speaking for myself only
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