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SubjectRe: [PATCH v0 00/71] perf: Add support for Intel Processor Trace
Ingo Molnar <> writes:

> * Alexander Shishkin <> wrote:
>> Hi,
>> This patchset adds support for Intel Processor Trace (PT) extension
>> [1] of Intel Architecture that allows the capture of information
>> about software execution flow, to the perf kernel and userspace
>> infrastructure. We provide an abstraction for it called "itrace" for
>> "instruction trace" ([2]).
> Ok, this feature looks rather interesting.
> On the hardware side this is essentially BTS (Branch Trace Store) on
> steroids (with many extensions), right?

Yes, you get timestamps and all sorts of other useful data in the trace
and the performance intrusion is much less than that of BTS.


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