Re: [PATCH v0 00/71] perf: Add support for Intel Processor Trace

[Alexander Shishkin]

Ingo Molnar <mingo@xxxxxxxxxx> writes:

> * Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> 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.

Regards,
--
Alex
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