The Future Of Linux Suspend
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- Constance Taylor
- 6 years ago
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1 Outlines
2 Outlines Part 1: State Of The Art Part 1: State Of The Art 1 Suspend To RAM - Whitelists s2ram HAL 2 Suspend To Disk Kernel pace Suspend TuxOnIce
3 Outlines Part 2: What s Next? Part 2: What s Next? 3 Future Trends Kernel - Freezer Kernel - Driver Infrastructure Kernel - TuxOnIce Merge Kernel - Suspend To Disk Using Kdump Kernel - Sleepy Linux pace - Whitelists pace - pm-utils 4
4 Suspend To RAM - Whitelists Suspend To Disk Part I State Of The Art
5 Suspend To RAM - Whitelists Suspend To Disk s2ram Whitelists - s2ram Part of the uswsusp project: Extensive whitelist, pretty good quality Standalone - no other software needed Unflexible - can only do DMI table (SMBIOS) matching Problems if one machine type is shipped with different graphics chips Needs to be recompiled to change the whitelist
6 Suspend To RAM - Whitelists Suspend To Disk HAL Whitelists - HAL Part of the hal-info package Pretty extensive whitelist Flexible - can match on everything HAL knows about Can easily be extended by adding a.fdi-file You need HAL running to use it
7 Suspend To RAM - Whitelists Suspend To Disk Kernel Kernel Method echo disk > /sys/power/state Simple, proven, works No fancy options, relatively slow In mainline kernel since 2.6.0, usable since 2.6.5
8 Suspend To RAM - Whitelists Suspend To Disk pace Suspend Uswsusp More complicated to set up (Distribution s job) Fancy options (compression, encryption, splash screens) all done in userspace In mainline kernel since rc1
9 Suspend To RAM - Whitelists Suspend To Disk TuxOnIce Tuxonice - Formerly Known As suspend2 Developed and maintained as a kernel patch by Nigel Cunningham Relatively easy to set up, once the patched kernel is built Fancy options (compression, encryption, splash screens) in kernelspace Well supported by Nigel
10 Part II What s Next?
11 Kernel - Freezer Suspend Future - Kernel Freezer Stops all processes during suspend and resume Some people with freezer problems want to remove it Will not go away soon, but is going to be removed eventually Removal needs to be considered in many parts of the kernel First for suspend to RAM, later also for suspend to disk Removal will probably not solve all problems automagically
12 Kernel - Driver Infrastructure Suspend Future - Kernel Driver Infrastructure / Powermanagement Core Rafa l Wysocki is overhauling the driver infrastructure Planned for Development is ongoing, but slower than planned Takes longer in order to not break everybodys system Work is being done on the PM core preparing for the freezer removal
13 Kernel - TuxOnIce Merge Suspend Future - Kernel TuxOnIce Merge For some time, Nigel tried to merge TuxOnIce into mainline TuxOnIce is very dependant on the freezer The freezer is probably going away - a merge becomes more unlikely Nigel is contributing lots of good bugfixes for drivers and infrastructure to mainline
14 Kernel - Suspend To Disk Using Kdump Suspend Future - Kernel Using kdump For Suspend Some think that current suspend to disk methods are fundamentally broken Using kdump to suspend a machine shall fix this brokenness The experts are waiting for a working solution which is comparable to the existing ones
15 Kernel - Sleepy Linux Suspend Future - Sleepy Linux Sleepy Linux - Suspend much more often Pavel Machek is working on it Today s hardware is mostly capable of doing better: with correctly set up wakeups, machine can sleep and successfully pretend it is not sleeping by waking up whenever something interesting happens. Current State: Prototype
16 pace - Whitelists Suspend Future - Whitelists Having whitelists in different places is doubled work HAL is more flexible at matching hardware Some efforts will move from the s2ram whitelist to the hal-info list Even if this means that you need HAL / pm-utils installed
17 pace - pm-utils Suspend Future - pm-utils pm-utils have effectively been forked Nobody is working on the original project anymore Lots of cosmetic changes, not much substantial No changes for the users (yet)
18 Suspend Future - Found a problem? Report it! Distribution s Bugzilla - If it s a kernel problem - LKML or Kernel developers usually don t bite! ;-)
19 Suspend Future - Bug reports Product: opensuse 11.0 Component: Mobile Devices
20 Thank You! Important Links: pace suspend: s2ram Introduction: pm-utils Introduction: TuxOnIce:
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