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Message-Id: <200802050224.51039.rjw@sisk.pl>
Date: Tue, 5 Feb 2008 02:24:50 +0100
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Pavel Machek <pavel@....cz>
Cc: kernel list <linux-kernel@...r.kernel.org>,
Linux-pm mailing list <linux-pm@...ts.osdl.org>,
Len Brown <len.brown@...el.com>
Subject: Re: Small pm documentation cleanups
Len, please pick this up, thanks.
On Tuesday, 5 of February 2008, Pavel Machek wrote:
>
> Small documentation fixes/additions that accumulated in my tree.
>
> Signed-off-by: Pavel Machek <pavel@...e.cz>
Acked-by: Rafael J. Wysocki <rjw@...k.pl>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index cf38689..3be3328 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -147,8 +147,10 @@ and is between 256 and 4096 characters.
> default: 0
>
> acpi_sleep= [HW,ACPI] Sleep options
> - Format: { s3_bios, s3_mode }
> - See Documentation/power/video.txt
> + Format: { s3_bios, s3_mode, s3_beep }
> + See Documentation/power/video.txt for s3_bios and s3_mode.
> + s3_beep is for debugging; it beeps on PC speaker as soon as
> + kernel's real-mode entry point is called.
>
> acpi_sci= [HW,ACPI] ACPI System Control Interrupt trigger mode
> Format: { level | edge | high | low }
> diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt
> index aea7e92..d3e5e4e 100644
> --- a/Documentation/power/swsusp.txt
> +++ b/Documentation/power/swsusp.txt
> @@ -386,6 +386,11 @@ before suspending; then remount them aft
> There is a work-around for this problem. For more information, see
> Documentation/usb/persist.txt.
>
> +Q: Can I suspend-to-disk using a swap partition under LVM?
> +
> +A: No. You can suspend successfully, but you'll not be able to
> +resume. uswsusp should be able to work with LVM, see suspend.sf.net.
> +
> Q: I upgraded the kernel from 2.6.15 to 2.6.16. Both kernels were
> compiled with the similar configuration files. Anyway I found that
> suspend to disk (and resume) is much slower on 2.6.16 compared to
> diff --git a/drivers/acpi/hardware/hwsleep.c b/drivers/acpi/hardware/hwsleep.c
> index fd1c4ba..058d0be 100644
> --- a/drivers/acpi/hardware/hwsleep.c
> +++ b/drivers/acpi/hardware/hwsleep.c
> @@ -286,13 +286,13 @@ acpi_status asmlinkage acpi_enter_sleep_
> }
>
> /*
> + * 1) Disable/Clear all GPEs
> * 2) Enable all wakeup GPEs
> */
> status = acpi_hw_disable_all_gpes();
> if (ACPI_FAILURE(status)) {
> return_ACPI_STATUS(status);
> }
> -
> acpi_gbl_system_awake_and_running = FALSE;
>
> status = acpi_hw_enable_all_wakeup_gpes();
> diff --git a/drivers/acpi/sleep/main.c b/drivers/acpi/sleep/main.c
> index 485de13..56e09cf 100644
> --- a/drivers/acpi/sleep/main.c
> +++ b/drivers/acpi/sleep/main.c
> @@ -170,7 +170,7 @@ static int acpi_pm_enter(suspend_state_t
> /* Reprogram control registers and execute _BFS */
> acpi_leave_sleep_state_prep(acpi_state);
>
> - /* ACPI 3.0 specs (P62) says that it's the responsabilty
> + /* ACPI 3.0 specs (P62) says that it's the responsibilty
> * of the OSPM to clear the status bit [ implying that the
> * POWER_BUTTON event should not reach userspace ]
> */
> diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
> index ef9b802..b275ffb 100644
> --- a/kernel/power/Kconfig
> +++ b/kernel/power/Kconfig
> @@ -74,14 +74,14 @@ config PM_TRACE_RTC
> RTC across reboots, so that you can debug a machine that just hangs
> during suspend (or more commonly, during resume).
>
> - To use this debugging feature you should attempt to suspend the machine,
> - then reboot it, then run
> + To use this debugging feature you should attempt to suspend the
> + machine, then reboot it, then run
>
> dmesg -s 1000000 | grep 'hash matches'
>
> CAUTION: this option will cause your machine's real-time clock to be
> set to an invalid time after a resume.
>
> config PM_SLEEP_SMP
> bool
> depends on SMP
> @@ -123,7 +129,8 @@ config HIBERNATION
> called "hibernation" in user interfaces. STD checkpoints the
> system and powers it off; and restores that checkpoint on reboot.
>
> - You can suspend your machine with 'echo disk > /sys/power/state'.
> + You can suspend your machine with 'echo disk > /sys/power/state'
> + after placing resume=/dev/swappartition on kernel command line.
> Alternatively, you can use the additional userland tools available
> from <http://suspend.sf.net>.
>
> diff --git a/kernel/power/main.c b/kernel/power/main.c
> index 6a6d5eb..d3df5af 100644
> --- a/kernel/power/main.c
> +++ b/kernel/power/main.c
> @@ -223,6 +226,7 @@ void __attribute__ ((weak)) arch_suspend
> * @state: state to enter
> *
> * This function should be called after devices have been suspended.
> + * May not sleep.
> */
> static int suspend_enter(suspend_state_t state)
> {
> @@ -250,6 +255,8 @@ static int suspend_enter(suspend_state_t
> * suspend_devices_and_enter - suspend devices and enter the desired system
> * sleep state.
> * @state: state to enter
> + *
> + * Needs to be called from process context and may sleep.
> */
> int suspend_devices_and_enter(suspend_state_t state)
> {
> @@ -341,6 +349,8 @@ static inline int valid_state(suspend_st
> * happen when we wake up.
> * Then, do the setup for suspend, enter the state, and cleaup (after
> * we've woken up).
> + *
> + * Needs to be called from process context, and may sleep.
> */
> static int enter_state(suspend_state_t state)
> {
>
--
"Premature optimization is the root of all evil." - Donald Knuth
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