linux-kernel - Re: [PATCH] show_task: real

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Message-ID: <alpine.LFD.1.00.0801090800360.3148@woody.linux-foundation.org>
Date:	Wed, 9 Jan 2008 08:03:51 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Roland McGrath <roland@...hat.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] show_task: real_parent



On Wed, 9 Jan 2008, Roland McGrath wrote:
> 
> The show_task function invoked by sysrq-t et al displays the
> pid and parent's pid of each task.  It seems more useful to
> show the actual process hierarchy here than who is using
> ptrace on each process.

Hmm. It could go both ways. If the problem is some ptrace()/wait4() 
interaction issue (which is certainly not unheard of!) the parent that 
matters for the kernel may be the right thing to print out.

I wonder if we should just print out both (or perhaps print out the 
ptrace parent only if it differs from the normal parent?)

I'll apply this, because I agree that it's sensible in general, I just 
wonder how often anybody really even cares about the parent information 
when it's not about some wait-related issue..

		Linus
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