linux-kernel - Re: [RFC,PATCH 14/14] utrace core

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Message-Id: <20091215025917.B6882D8@magilla.sf.frob.com>
Date:	Mon, 14 Dec 2009 18:59:17 -0800 (PST)
From:	Roland McGrath <roland@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Ananth Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, utrace-devel@...hat.com
Subject: Re: [RFC,PATCH 14/14] utrace core

> SIGCONT can wake up the TASK_STOPPED tracee. I don't think the tracer
> should ever rely on TASK_STOPPED (utrace never does). If the tracer
> needs the "really stopped" tracee we have UTRACE_STOP, and this means
> TASK_TRACED.

Ah, yes.  utrace_control(task,,UTRACE_STOP) while task is in TASK_STOPPED
means turning it into TASK_TRACED.


Thanks,
Roland
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