linux-toradex.git/include/linux/timex.h, branch v2.6.22.7

[PATCH] HZ free ntp

2007-02-16T16:13:56+00:00

Distangle the NTP update from HZ.  This is necessary for dynamic tick enabled
kernels.

Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: john stultz 
Cc: Roman Zippel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] use cycle_t instead of u64 in struct time_interpolator

2007-02-11T18:51:31+00:00

The 32bit and 64bit PARISC Linux kernels suffers from the problem, that the
gettimeofday() call sometimes returns non-monotonic times.

The easiest way to fix this, is to drop the PARISC-specific implementation
and switch over to the generic TIME_INTERPOLATION framework.

But in order to make it even compile on 32bit PARISC, the patch below which
touches the generic Linux code, is mandatory.

More information and the full patch with the parisc-specific changes is included in this thread: http://lists.parisc-linux.org/pipermail/parisc-linux/2006-December/031003.html

As far as I could see, this patch does not change anything for the existing
architectures which use this framework (IA64 and SPARC64), since "cycles_t"
is defined there as unsigned 64bit-integer anyway (which then makes this
patch a no-change for them).

Signed-off-by: Helge Deller 
Cc: 
Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] provide tickadj define

2006-10-06T15:53:40+00:00

Provide a tickadj compatibility define for archs still using it.

Signed-off-by: Roman Zippel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kernel/time/ntp.c: possible cleanups

2006-10-01T07:39:27+00:00

This patch contains the following possible cleanups:
- make the following needlessly global function static:
  - ntp_update_frequency()
- make the following needlessly global variables static:
  - time_state
  - time_offset
  - time_constant
  - time_reftime
- remove the following read-only global variable:
  - time_precision

Signed-off-by: Adrian Bunk 
Cc: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] ntp: cleanup defines and comments

2006-10-01T07:39:27+00:00

Remove a few unused defines and remove obsolete information from comments.

Signed-off-by: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] ntp: convert to the NTP4 reference model

2006-10-01T07:39:27+00:00

This converts the kernel ntp model into a model which matches the nanokernel
reference implementations.  The previous patches already increased the
resolution and precision of the computations, so that this conversion becomes
quite simple.

 explains:

The original NTP kernel interface was defined in units of microseconds.
That's what Linux implements.  As computers have gotten faster and can now
split microseconds easily, a new kernel interface using nanosecond units was
defined ("the nanokernel", confusing as that name is to OS hackers), and
there's an STA_NANO bit in the adjtimex() status field to tell the application
which units it's using.

The current ntpd supports both, but Linux loses some possible timing
resolution because of quantization effects, and the ntpd hackers would really
like to be able to drop the backwards compatibility code.

Ulrich Windl has been maintaining a patch set to do the conversion for years,
but it's hard to keep in sync.

Signed-off-by: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] ntp: convert time_freq to nsec value

2006-10-01T07:39:27+00:00

This converts time_freq to a scaled nsec value and adds around 6bit of extra
resolution.  This pushes the time_freq to its 32bit limits so the calculatons
have to be done with 64bit.

Signed-off-by: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] ntp: remove time_tolerance

2006-10-01T07:39:26+00:00

time_tolerance isn't changed at all in the kernel, so simply remove it, this
simplifies the next patch, as it avoids a number of conversions.

Signed-off-by: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] ntp: add time_adjust to tick length

2006-10-01T07:39:26+00:00

This folds update_ntp_one_tick() into second_overflow() and adds time_adjust
to the tick length, this makes time_next_adjust unnecessary.  This slightly
changes the adjtime() behaviour, instead of applying it to the next tick, it's
applied to the next second.

Signed-off-by: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] ntp: prescale time_offset

2006-10-01T07:39:26+00:00

This converts time_offset into a scaled per tick value.  This avoids now
completely the crude compensation in second_overflow().

Signed-off-by: Roman Zippel 
Cc: john stultz 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds