Messages in this thread | | | Date | Fri, 04 Apr 2003 23:12:02 +1200 | From | Nigel Cunningham <> | Subject | New Software Suspend Patch for testing. |
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Hi.
A new 2.5 port of the 2.4 version is available on www.sourceforge.net/projects/swsusp.
The changes from the last version are not huge; perhaps most significant is that the dynamically allocated bitmaps (in place of pageflags) are implemented. This won't mean anything to most people, but Andrew Morton, Pavel and Patrick should be happy. Note for Patrick: The driver code was using KERN_EMERGENCY to print when devices were suspended/resumed. Can we lower this to INFO (I did something alone these lines in this patch). It mucks up the nice display :>
Hopefully I'll soon find time to start bombarding Pavel, Patrick and Linus with incremental patches for merging :>. In the meantime, please give it a go.
Under 2.4, we use scripts that unload problematic drivers, switch to a text console and so on before starting the process. Hopefully this will end up being unneeded in 2.5 once the driver model is complete. In the meantime, however (especially if you get problems!), you might like to try first with a minimal load, and slowly add things. It does work fine on my Omnibook XE3! YMMV.
Brief howto: (Assuming you've applied the patch against 2.5.66 - other versions may work too). 1. Patch, compile as normal. 2. Ensure your kernel commandline includes resume=/dev/hdaX where X is a swap partition you will be using. More than one swap partition can be used. This just specifies which will have its header used to indicate that the system is suspended and where to find the data. 3. If you want debugging info: echo 1 20 15 31 > /proc/sys/kernel/swsusp (See line 201ff of kernel/suspend.c for what the numbers mean). 4. echo 4 > /proc/acpi/sleep to start the process. The system should save the image and powerdown. If you choose the debugging info, you'll have to press SHIFT at the end of each step. If you press SHIFT at other times, you can toggle this pausing on and off. Whether you selected the debugging info or not, you can press ALT to cancel the process. 5. To resume, reboot with the same kernel. The image should be detected and reloaded without you needing to do anything special. Pausing or not is state-persistent from when you suspended. 6. You should (DV) get your system back to where it was when you started the process.
Please report success/failure/questions on the swsusp mailing list. See Florent's home page for details.
Regards,
Nigel
-- Nigel Cunningham 495 St Georges Road South, Hastings 4201, New Zealand
Be diligent to present yourself approved to God as a workman who does not need to be ashamed, handling accurately the word of truth. -- 2 Timothy 2:14, NASB.
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