linux-kernel - Re: [patch 1/2] x86, bts: fork and exit handling

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Message-ID: <20081220081755.GA5581@elte.hu>
Date:	Sat, 20 Dec 2008 09:17:55 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Markus Metzger <markus.t.metzger@...el.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, hpa@...or.com,
	markus.t.metzger@...il.com, roland@...hat.com,
	eranian@...glemail.com
Subject: Re: [patch 1/2] x86, bts: fork and exit handling


* Markus Metzger <markus.t.metzger@...el.com> wrote:

> Add arch_ptrace_untrace() function that is called when the tracer
> detaches (either voluntarily or when the tracing task dies);
> ptrace_disable() is only called on a voluntary detach.
> 
> Add ptrace_fork() and arch_ptrace_fork(). They are called when a
> traced task is forked.
> 
> Clear DS and BTS related fields on fork.
> 
> Release DS resources and reclaim memory in ptrace_untrace(). This
> releases resources already when the tracing task dies. We used to do
> that when the traced task dies.
> 
> Signed-off-by: Markus Metzger <markus.t.metzger@...el.com>

applied to tip/tracing/hw-branch-tracer, thanks Markus! It's a nice 
cleanup too - to tear down any arch-level ptrace state that might come 
around.

	Ingo
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