[ 00/23] [Suspend2] Freezer Upgrade Patches

Hi everyone.

This set of patches represents the freezer upgrade patches from Suspend2.

The key features of this changeset are:

- Use of Christoph Lameter's todo list notifiers, which help with SMP
  cleanness.
- Splitting the freezing of kernel and userspace processes. Freezing
  currently suffers from a race because userspace processes can be
  submitting work for kernel threads, thereby stopping them from
  responding to freeze messages in a timely manner. The freezer can
  thus give up when it doesn't really need to. (This is not normally
  a problem only because load is not usually high).
- The use of bdev freezing to ensure filesystems are properly frozen,
  thereby increasing the integrity of on-disk data in the case where
  a resume doesn't occur. This is also helpful in the case of Suspend2,
  where we don't atomically copy all memory, instead writing LRU pages
  separately.

Signed-off-by: Nigel Cunningham <[email protected]>

--
Nigel Cunningham   nigel at suspend2 dot net   http://suspend2.net
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---

• Follow-Ups:
  • Re: [ 00/23] [Suspend2] Freezer Upgrade Patches
    • From: "Rafael J. Wysocki" <[email protected]>
  • Re: [ 00/23] [Suspend2] Freezer Upgrade Patches
    • From: Pavel Machek <[email protected]>
  • [ 15/23] [Suspend2] Helper for counting uninterruptible threads of a type.
    • From: Nigel Cunningham <[email protected]>
  • [ 16/23] [Suspend2] Helper to signal all threads of a type.
    • From: Nigel Cunningham <[email protected]>
  • [ 11/23] [Suspend2] Modify freezeable for freezing kernel threads separately.
    • From: Nigel Cunningham <[email protected]>
  • [ 08/23] [Suspend2] New freezer explanation for kernel/power/process.c
    • From: Nigel Cunningham <[email protected]>
  • [ 12/23] [Suspend2] Split freezing of threads according to whether user/kernelspace.
    • From: Nigel Cunningham <[email protected]>
  • [ 17/23] [Suspend2] Helper to prod processes that should have frozen but haven't.
    • From: Nigel Cunningham <[email protected]>
  • [ 02/23] [Suspend2] Add new include/linux/freezer.h header.
    • From: Nigel Cunningham <[email protected]>
  • [ 18/23] [Suspend2] Helper: Did we fail to freeze all threads of a type?
    • From: Nigel Cunningham <[email protected]>
  • [ 03/23] [Suspend2] Allow a notifier to remove itself from the notifier list.
    • From: Nigel Cunningham <[email protected]>
  • [ 20/23] [Suspend2] Modify process.c includes and export freezer state.
    • From: Nigel Cunningham <[email protected]>
  • [ 19/23] [Suspend2] Freeze all threads of a type.
    • From: Nigel Cunningham <[email protected]>
  • [ 04/23] [Suspend2] Todo notifier for processes.
    • From: Nigel Cunningham <[email protected]>
  • [ 05/23] [Suspend2] Make the freezer use todo lists.
    • From: Nigel Cunningham <[email protected]>
  • [ 21/23] [Suspend2] Remove unused DEBUG undef.
    • From: Nigel Cunningham <[email protected]>
  • [ 07/23] [Suspend2] Add which-to-thaw parameter to thaw_processes() calls.
    • From: Nigel Cunningham <[email protected]>
  • [ 14/23] [Suspend2] Helper for counting freezeable threads of a type.
    • From: Nigel Cunningham <[email protected]>
  • [ 01/23] [Suspend2] Make workqueues freezeable.
    • From: Nigel Cunningham <[email protected]>
  • [ 09/23] [Suspend2] Quieten the freezer for normal operation.
    • From: Nigel Cunningham <[email protected]>
  • [ 22/23] [Suspend2] Modify swsusp to thaw kernel threads while eating memory.
    • From: Nigel Cunningham <[email protected]>
  • [ 23/23] [Suspend2] Don't scan LRU while freezer is on.
    • From: Nigel Cunningham <[email protected]>
  • [ 10/23] [Suspend2] Add support for freezing filesystem bdevs.
    • From: Nigel Cunningham <[email protected]>
  • [ 13/23] [Suspend2] Add support for thawing just kernel threads or all threads.
    • From: Nigel Cunningham <[email protected]>
  • [ 06/23] [Suspend2] Disable usermode helper invocations when the freezer is on.
    • From: Nigel Cunningham <[email protected]>

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