RE: [tip:tracing/core] x86, bts: reenable ptrace branch tracesupport

[Metzger, Markus T]

>-----Original Message-----
>From: Peter Zijlstra [mailto:peterz@xxxxxxxxxxxxx]
>Sent: Wednesday, June 10, 2009 3:29 PM
>To: Metzger, Markus T
>Cc: Ingo Molnar; mingo@xxxxxxxxxx; hpa@xxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; tglx@xxxxxxxxxxxxx;
>oleg@xxxxxxxxxx; linux-tip-commits@xxxxxxxxxxxxxxx
>Subject: RE: [tip:tracing/core] x86, bts: reenable ptrace branch trace support
>
>On Wed, 2009-06-10 at 14:22 +0100, Metzger, Markus T wrote:
>>
>> The Debug Store interface is completely in-kernel. It does not expose
>> anything to the outside world.
>>
>> What we expose is a ptrace interface for branch tracing.
>> That this is built on top of Debug Store is completely hidden.
>> The Debug Store interface may be changed without impacting the
>> user-visible part at any time.
>>
>> I do think that a ptrace interface makes sense since debuggers are the
>> targeted users for branch tracing.
>>
>> I don't see why we should not merge the fixes now and then rework the
>> in-kernel parts as needed for supporting PEBS.
>
>Ok, so what is all that account_locked_memory() for?

To allow debuggers (users) to decide how much memory they want to spend
on branch tracing.

regards,
markus.

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