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2.4: updated preemptive kernel patch

2.4: updated preemptive kernel patch

Post by Robert Lov » Mon, 01 Apr 2002 03:30:11



This is the preemptive kernel patch, supported by MontaVista.  Updated
patches for 2.4.18, 2.4.19-pre5, and 2.4.19-pre4-ac3 are now available
at:

        ftp://ftp.kernel.org/pub/linux/kernel/people/rml/preempt-kernel

as well as older patches for older kernel revisions.

The only major change aside from the sync up is some simple debug code
that will catch most any preempt_count oddity without much overhead,
courtesy of Andrew Morton.  Basically just check the preempt_count for a
non-zero value on do_exit.

Nothing pending in the 2.4 codebase.  I have a bunch of changes queued
for preempt-stats which I will get out real soon now.  For 2.5, there
are a couple of indirect preempt-related optimizations and lock-fixings
in store soon.

Recent Change Log:

20020328

- simple but complete debug check in do_exit    (Andrew Morton)

20020301:

- fix the preempt_count for non-CPU0 idle       (George Anzinger)
  threads

Enjoy,

        Robert Love

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1. 2.4: updated preemptive kernel patch

It has been awhile since a post since I have been concentrating on
preempt-kernel in 2.5, however 2.4 preempt-kernel work is not stopping.

Patches for 2.4.18, 2.4.19-pre2, and 2.4.19-pre2-ac2 are available at:

        http://www.kernel.org/pub/linux/kernel/people/rml/preempt-kernel/v2.4

please use a mirror.  Patches for earlier kernel releases are available,
too, but may not be in sync with this release.  Users of Ingo's O(1)
scheduler are encouraged to use Alan's tree as it has O(1) merged.
Older 2.5 patches are available as well, but preempt-kernel was merged
as of 2.5.4-pre6.

Also available are updated preempt-stats patches (tool for determining
length and cause of preempt-off periods):

        http://www.kernel.org/pub/linux/kernel/people/rml/preempt-stats/

for 2.4.18, 2.4.19-pre2, and 2.5.5.

ChangeLog for preempt-kernel:

20020301:

- fix the preempt_count for non-CPU0 idle       (George Anzinger)
  threads

20020210:

- (2.5 only) merge i386 codebase into official  (me, Linus)
- (2.5 only) remove /proc/<pid>/stat code (me)

20020209:

- (2.5 only) cleanup entry.S                    (Linus)
- (2.5 only) remove dependencies on sched.h     (Linus)
- (2.5 only) use current_thread_info()-> not (Linus)
  current->thread_info->

20020208:

- (2.5 only) use new thread_info struct not the (me)
  task_struct for preempt_count

20020207:

- barrier in preempt_schedule to enforce        (George Anzinger)
  proper ordering to ensure no missed
  preemptions

ChangeLog for preempt-stats:

20020302:

- make preempt-stats report meaningful stats    (Todd Poynor)
  on SMP
- fix overflow with large latency values on     (Todd Poynor)
  high clock-rate CPUs

20020204:

- accidently removed preempt_schedule export    (Willy Tarreau)
- properly export statistics functions          (Willy Tarreau)

        Robert Love

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