linux-kernel - Re: [PATCH RT] kernel/hrtimer: be non-freezeable in cpu

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Message-ID: <5304D0D5.3030802@linutronix.de>
Date:	Wed, 19 Feb 2014 16:42:13 +0100
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <williams@...hat.com>,
	"Luis Claudio R. Goncalves" <lclaudio@...g.org>,
	John Kacur <jkacur@...hat.com>,
	Ulrich Obergfell <uobergfe@...hat.com>
Subject: Re: [PATCH RT] kernel/hrtimer: be non-freezeable in cpu_chill()

On 02/19/2014 04:27 PM, Steven Rostedt wrote:

> Hmm, I wonder if this is because msleep() sets the tasks state to
> TASK_UNINTERRUPTIBLE, and hrtimer_nanosleep sets it to
> TASK_INTERRUPTIBLE.

No, it is because freezable_schedule() is called via do_nanosleep() in
hrtimer call path and msleep() calls schedule() without it.

Sebastian
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