linux-kernel - Re: [RFC PATCH 7/X] ptrace: mv task->parent ptrace_task->pt

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Message-Id: <20090528003256.86E4EFC2BD@magilla.sf.frob.com>
Date:	Wed, 27 May 2009 17:32:56 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Christoph Hellwig <hch@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 7/X] ptrace: mv task->parent ptrace_task->pt_tracer

> This is optimization. If exit_code == 0 we do not need to fixup
> ->last_siginfo. Note that we have another "child->exit_code = exit_code"
> below in the slow path.

Ok, I see.

> > It can check for !child->last_siginfo before lock_task_sighand().
> 
> ptrace_stop() always sets ->last_siginfo != NULL.

Oh, right.  It's only job control stops where it's NULL.

> OK, lets do this change later ;)

Agreed.


Thanks,
Roland
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