linux-kernel - Re: [BUG] Strange 1-second pauses during Resume-from-RAM

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Message-ID: <20071130184625.GB9928@elte.hu>
Date:	Fri, 30 Nov 2007 19:46:25 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Jörn Engel <joern@...fs.org>
Cc:	Mark Lord <lkml@....ca>, Pavel Machek <pavel@....cz>,
	Mark Lord <liml@....ca>, Thomas Gleixner <tglx@...utronix.de>,
	len.brown@...el.com, Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pm@...ts.linux-foundation.org,
	rjw@...k.pl
Subject: Re: [BUG] Strange 1-second pauses during Resume-from-RAM


* Jörn Engel <joern@...fs.org> wrote:

> On Fri, 30 November 2007 14:43:12 +0100, Ingo Molnar wrote:
> > 
> >   http://redhat.com/~mingo/latency-tracing-patches/latency-tracing-v2.6.24-rc3.combo.patch
> > 
> > does it work any better?
> 
> It compiles.  It boots with a 512M RAM (384M was too little with all
> the other debug options on).  But it seems to lock up when running
> trace-cmd.  On a rerun it locks up again, but with different output.

hm, you should decrease MAX_TRACE in kernel/latency_tracing.c from 1 
million to 16K or so. 1 million entries probably depletes lowmem quite 
seriously.

> Rerun was captured:
> http://logfs.org/~joern/trace1.jpg

hm, that looks weird. if you disable CONFIG_PROVE_LOCKING, does that 
improve things? (or just turns a noisy lockup into a silent lockup?)

> I should do a couple of runs, but my girlfriend claims realtime 
> priority for the evening.

yeah, SCHED_IDLE is not generally well received by them.

	Ingo
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