linux-kernel - Re: [PATCH] proc: don't confuse /bin/ps by zombie delay_group

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Message-Id: <20080901010753.8FA4D154243@magilla.localdomain>
Date:	Sun, 31 Aug 2008 18:07:53 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Albert Cahalan <acahalan@...il.com>,
	Alexey Dobriyan <adobriyan@...nvz.org>,
	Michael Kerrisk <mtk.manpages@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] proc: don't confuse /bin/ps by zombie delay_group_leader's

I don't think it's right to change /proc/pid/task/tid/status this way.
The real status is true and correct for the individual task, no matter what.
If you want to change /proc/pid/status, then you ought to split it into
proc_tgid_status and proc_tid_status variants to differ this way.

I don't really have an opinion either way about this for /proc/pid/status.
We've known it behaved this way for a very long time, and I've always
considered it procps's problem to display such situations in ways that
users find most useful.  It can already quickly tell that situation by a
"Threads:" line with >1 when "State:" says "Z".  If you do change it, it
might be nicer to display it as a (compatible) special case:

State:	S (delayed-leader)

Thanks,
Roland
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