linux-kernel - Re: [linux-pm] [PATCH v2] Add suspend/resume for HPET

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Message-ID: <b6a2187b0703312013o6c305e00v829894f215812550@mail.gmail.com>
Date:	Sun, 1 Apr 2007 11:13:31 +0800
From:	"Jeff Chua" <jeff.chua.linux@...il.com>
To:	"David Brownell" <david-b@...bell.net>
Cc:	linux-pm@...ts.linux-foundation.org,
	"Adrian Bunk" <bunk@...sta.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>, gregkh@...e.de,
	"Ingo Molnar" <mingo@...e.hu>,
	"Jens Axboe" <jens.axboe@...cle.com>, jgarzik@...ox.com,
	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, linux-ide@...r.kernel.org,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	"Maxim Levitsky" <maximlevitsky@...il.com>,
	"Michael S. Tsirkin" <mst@...lanox.co.il>,
	"Sergei Shtylyov" <sshtylyov@...mvista.com>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: Re: [linux-pm] [PATCH v2] Add suspend/resume for HPET

On 4/1/07, David Brownell <david-b@...bell.net> wrote:
> for those will all get grouped together ... suspended "very late" and
> resumed "very early", regardless of when they get registered.  Pretty
> much the driver model parts of what Linus was suggesting; clockevent
> bits would still be needed.

I tested your patch with CONFIG_NO_HZ=y, but it still hangs while
suspending to disk (before the percent saving).

But one discovery. I get tired of all these hangs, so I decided to
press some keys and the power button. Accidentally, the suspend
proceeded and successfully suspended!

I tried many more times, and discovered that to proceed with the
suspend, hit any 4 keys slowly. (e.g. "F1 F2 F3 F4", or "1 2 3 4").

My .config has CONFIG_NO_HZ=y and CONFIG_HIGH_RES_TIMERS=y, but I
suppose CONFIG_HIGH_RES_TIMERS=y gots nothing to do with the hang.

I went back with my vanilla 2.6.21-rc5 with Maxim's patch, and with
hitting the keys, I could suspend to disk with CONFIG_NO_HZ=y and
CONFIG_HIGH_RES_TIMERS=y.

Jeff.
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