diff options
| author | Justin Waters <justin.waters@timesys.com> | 2008-02-26 13:07:02 -0500 |
|---|---|---|
| committer | Justin Waters <justin.waters@timesys.com> | 2008-02-26 13:07:02 -0500 |
| commit | b80a32b9cc634adfa8eaef33ec981e7febf2ade2 (patch) | |
| tree | f256bce13ba11f514a388160df84e1410bedbe2b /Documentation/power/swsusp.txt | |
| parent | 594133ef22fae0d737bd1b57352cf3f48a192c63 (diff) | |
Update the i.MX31 Kernel to 2.6.232.6.23-mx31ads-2008022618072.6.23-mx31-200802261807
This is the result of a brute-force attempt to update the kernel to 2.6.23.
Now that we have a git tree, our effort will be a little nicer in the future.
Signed-off-by: Justin Waters <justin.waters@timesys.com>
Diffstat (limited to 'Documentation/power/swsusp.txt')
| -rw-r--r-- | Documentation/power/swsusp.txt | 21 |
1 files changed, 7 insertions, 14 deletions
diff --git a/Documentation/power/swsusp.txt b/Documentation/power/swsusp.txt index 5b8d6953f05e..aea7e9209667 100644 --- a/Documentation/power/swsusp.txt +++ b/Documentation/power/swsusp.txt @@ -140,21 +140,11 @@ should be sent to the mailing list available through the suspend2 website, and not to the Linux Kernel Mailing List. We are working toward merging suspend2 into the mainline kernel. -Q: A kernel thread must voluntarily freeze itself (call 'refrigerator'). -I found some kernel threads that don't do it, and they don't freeze -so the system can't sleep. Is this a known behavior? - -A: All such kernel threads need to be fixed, one by one. Select the -place where the thread is safe to be frozen (no kernel semaphores -should be held at that point and it must be safe to sleep there), and -add: - - try_to_freeze(); - -If the thread is needed for writing the image to storage, you should -instead set the PF_NOFREEZE process flag when creating the thread (and -be very careful). +Q: What is the freezing of tasks and why are we using it? +A: The freezing of tasks is a mechanism by which user space processes and some +kernel threads are controlled during hibernation or system-wide suspend (on some +architectures). See freezing-of-tasks.txt for details. Q: What is the difference between "platform" and "shutdown"? @@ -393,6 +383,9 @@ safest thing is to unmount all filesystems on removable media (such USB, Firewire, CompactFlash, MMC, external SATA, or even IDE hotplug bays) before suspending; then remount them after resuming. +There is a work-around for this problem. For more information, see +Documentation/usb/persist.txt. + 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 |