linux-kernel - Re: [3/5] 2.6.21-rc4: known regressions (v2)

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Date:	Sun, 25 Mar 2007 19:25:48 +0200
From:	Thomas Meyer <thomas@...3r.de>
To:	Adrian Bunk <bunk@...sta.de>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Tony Luck <tony.luck@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: [3/5] 2.6.21-rc4: known regressions (v2)

Adrian Bunk schrieb:
> On Sun, Mar 25, 2007 at 01:41:33PM +0200, Thomas Meyer wrote:
>   
>> ...
>> The first suspend to disk is ok. The second suspend to disk has a
>> strange behaviour:
>> 1.) write pm image
>> 2.) the system disable the non-boot cpus again (i guess this happens in
>> power_down())
>> 3.) the system doesn't power down.
>> 4.) pressing any key and the system powers down.
>> ...
>>     
>
> Is this also present with 2.6.20, or is it a regression?
>   
No, this one is not present in 2.6.20 and this error doesn't (head=
317ec6cd00f25d05d153a780bc178c5335f320ee) occur with NO_HZ=n and
HIGH_RES_TIMERS=n

This error is maybe related with this commit:

commit cd05a1f818073a623455a58e756c5b419fc98db9
Author: Thomas Gleixner <tglx@...utronix.de>
Date:   Sat Mar 17 00:25:52 2007 +0100

    [PATCH] clockevents: Fix suspend/resume to disk hangs

    I finally found a dual core box, which survives suspend/resume without
    crashing in the middle of nowhere. Sigh, I never figured out from the
    code and the bug reports what's going on.

    The observed hangs are caused by a stale state transition of the clock
    event devices, which keeps the RCU synchronization away from completion,
    when the non boot CPU is brought back up.

    The suspend/resume in oneshot mode needs the similar care as the
    periodic mode during suspend to RAM. My assumption that the state
    transitions during the different shutdown/bringups of s2disk would go
    through the periodic boot phase and then switch over to highres resp.
    nohz mode were simply wrong.

    Add the appropriate suspend / resume handling for the non periodic
    modes.

    Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

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