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

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Date:	Sat, 1 Dec 2007 21:54:56 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	J??rn 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


* J??rn Engel <joern@...fs.org> wrote:

> Almost.  "-serial stdio" was missing.  Much better now.
> 
> stopped custom tracer.
> BUG: spinlock recursion on CPU#0, sh/953
>  lock: c030f280, .magic: dead4ead, .owner: sh/953, .owner_cpu: 0
> Pid: 953, comm: sh Not tainted 2.6.24-rc3-ge1cca7e8-dirty #2
>  [<c0103a04>] show_trace_log_lvl+0x35/0x54
>  [<c010450a>] show_trace+0x2c/0x2e
>  [<c0104e6d>] dump_stack+0x84/0x8a
>  [<c01ded7c>] spin_bug+0xa7/0xae
>  [<c01def14>] _raw_spin_lock+0x45/0xfa
>  [<c02a02b1>] _spin_lock_irqsave+0x68/0x7a
>  [<c01087e7>] pit_read+0x14/0x99
>  [<c0130ee9>] get_monotonic_cycles+0xf/0x2d

ah. You should mark pit_read() function as notrace. PIT clocksource is 
rare. (add the 'notrace' word to the function prototype)

	Ingo
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