linux-kernel - Re: [perfmon2] perfmon2 merge news

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Date:	Sat, 15 Dec 2007 10:54:41 -0500
From:	fche@...hat.com (Frank Ch. Eigler)
To:	eranian@....hp.com
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	paulus@...ba.org, akpm@...ux-foundation.org, gregkh@...e.de,
	mucci@...utk.edu, wcohen@...hat.com, robert.richter@....com,
	andi@...stfloor.org, eranian@...il.com, roland@...hat.com
Subject: Re: [perfmon2] perfmon2 merge news

Stephane Eranian <eranian@....hp.com> writes:

> [...]
>> > [...]  AFAIK, there is no single call to stop T1 and wait until it
>> > is completely off the CPU, unless we go through the (internal)
>> > ptrace interface.
>> 
>> The utrace code supports this style of thread manipulation better
>> than ptrace.
>
> Afre you saying that utrace provides a utrace_thread_stop(tid) call
> that returns only when the thread tid is off the CPU. And then there
> is a utrace_thread_resume(tid) call. If that's the case then that is
> what I need.

While I see no single call, it can be synthesized from a sequence of
them: utrace_attach, utrace_set_flags (... UTRACE_ACTION_QUESCE ...),
then waiting for a callback.  Roland, is there a more compact way?

> How are we with regards to utrace integration?

Roland McGrath is working on breaking the patches down.

- FChE
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