--- Ingo Molnar <mingo@elte.hu> wrote: 

i've uploaded the -P4 patch:

 
http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P4

the main change is a more robust latency tracer - the previous one was
not 100% correct for interrupts. People who have exprienced those weird
~1msec latencies in the idle task please re-check and re-post latency
traces.

I receive the following errors on compile, after make has gotten through
building all config options:

-- SNIP --

  GEN     .version
  CHK     include/linux/compile.h
  UPD     include/linux/compile.h
  CC      init/version.o
  LD      init/built-in.o
  LD      .tmp_vmlinux1
arch/i386/kernel/built-in.o(.text+0x398e): In function `do_nmi':
: undefined reference to `__trace'
arch/i386/kernel/built-in.o(.text+0x4101): In function `do_IRQ':
: undefined reference to `__trace'
arch/i386/kernel/built-in.o(.text+0xe1e9): In function
`smp_apic_timer_interrupt':
: undefined reference to `__trace'
arch/i386/mm/built-in.o(.text+0x71b): In function `do_page_fault':
: undefined reference to `__trace'
make: *** [.tmp_vmlinux1] Error 1


-P2 and -P3 gave me the same errors except for
`smp_apic_timer_interrupt'.
I have tried my .config, default, allyes, and allno, and I get the same
result regardless of config.  Tree is fresh, patch applied with -Np1
<../[patchname].  I also get fuzz and offsets, but they don't seem to
bear on the problem directly.  I'm currently running -P1, which doesn't
have this problem.  gcc is 3.3.4.

With thanks for a smoother system feel,
Matthew Frost
artusemrys at sbcglobal dot net