linux-kernel - Re: process 'stuck' at exit.

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Message-ID: <20131210221621.GD5050@redhat.com>
Date:	Tue, 10 Dec 2013 17:16:21 -0500
From:	Dave Jones <davej@...hat.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Darren Hart <dvhart@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: process 'stuck' at exit.

On Tue, Dec 10, 2013 at 05:09:46PM -0500, Steven Rostedt wrote:
 
 > So you can do either:
 > 
 > trace-cmd record -p function -l get_user_pages_fast --func-stack sleep 5
 > 
 > Which will trace the get_user_pages_fast and spit out a full call trace.
This gives me a 100M trace.dat, but trace show shows..

# tracer: nop
#
# entries-in-buffer/entries-written: 0/0   #P:4
#
#                              _-----=> irqs-off
#                             / _----=> need-resched
#                            | / _---=> hardirq/softirq
#                            || / _--=> preempt-depth
#                            ||| /     delay
#           TASK-PID   CPU#  ||||    TIMESTAMP  FUNCTION
#              | |       |   ||||       |         |

and that's it.
 
 > Or if you don't want to use trace-cmd, you can do it by hand.

Given the state the system is in, I don't want to perturb it too much.

	Dave

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