linux-kernel - Re: [ 00/48] 3.4.37-stable review

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Date:	Mon, 18 Mar 2013 20:57:35 -0400 (EDT)
From:	Parag Warudkar <parag.lkml@...il.com>
To:	Shuah Khan <shuahkhan@...il.com>
cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	parag.lkml@...il.com, eranian@...gle.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, stable@...r.kernel.org
Subject: Re: [ 00/48] 3.4.37-stable review



On Mon, 18 Mar 2013, Shuah Khan wrote:

> I am seeing the following warning after suspend and resume:
> 
> [  665.841331] Component: resume devices, time: 10628

[snip]

> [  665.841446] Pid: 2686, comm: bash Not tainted 3.4.37-rc1+ #13
> [  665.841450] Call Trace:
> [  665.841463]  [<ffffffff8105136f>] warn_slowpath_common+0x7f/0xc0
> [  665.841471]  [<ffffffff81051466>] warn_slowpath_fmt+0x46/0x50
> [  665.841478]  [<ffffffff81097086>] suspend_test_finish+0x86/0x90
> [  665.841484]  [<ffffffff81096c2e>] suspend_devices_and_enter+0x16e/0x330
> [  665.841491]  [<ffffffff81096f7f>] pm_suspend+0x18f/0x1f0

It is coming from kernel/power/suspend_test.c:53 -
 
/* Warning on suspend means the RTC alarm period needs to be
         * larger -- the system was sooo slooowwww to suspend that the
         * alarm (should have) fired before the system went to sleep!
         *
         * Warning on either suspend or resume also means the system
         * has some performance issues.  The stack dump of a WARN_ON
         * is more likely to get the right attention than a printk...
         */
        WARN(msec > (TEST_SUSPEND_SECONDS * 1000),
             "Component: %s, time: %u\n", label, msec);

That just means your system is slow to suspend/resume. I've seen the same 
many times on my older machines - you can likely ignore it.

--Parag
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