RE: [patch, resend] x86, perf_counter, bts: optimize BTS overflowhandling

[Metzger, Markus T]

>-----Original Message-----
>From: Peter Zijlstra [mailto:a.p.zijlstra@xxxxxxxxx]
>Sent: Tuesday, September 15, 2009 1:25 PM
>To: Metzger, Markus T
>Cc: mingo@xxxxxxx; tglx@xxxxxxxxxxxxx; hpa@xxxxxxxxx; markus.t.metzger@xxxxxxxxx; linux-
>kernel@xxxxxxxxxxxxxxx
>Subject: RE: [patch, resend] x86, perf_counter, bts: optimize BTS overflow handling
>
>On Tue, 2009-09-15 at 12:18 +0100, Metzger, Markus T wrote:
>
>> >> Restructure perf_counter sampling into sample creation and sample
>> >> output.
>> >> Prepare a single reference sample for BTS sampling and update the from
>> >> and to address fields when draining the BTS buffer.
>> >> Drain the entire BTS buffer between a single perf_output_begin() /
>> >> perf_output_end() pair.
>> >
>> >Generally looks very nice, one thing though, why did you take regs out
>> >of perf_sample_data, now you get to pass around one extra param..
>>
>>
>> That is to make perf_sample_data describe the sample directly.
>>
>> The regs are used to create the sample; they're not needed once
>> the sample has been created.
>
>True, but I'd have been lazy and not added that extra parameter all over
>the place, but sure ;-)
>
>This is now fast enough to BTS trace the kernel too?

It is. At least on my box.

Once that patch has been accepted, I will ask Ingo to drop
1653192f510bd8114b7b133d7289e6e5c3e95046.

regards,
markus.

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