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authorTony Luck <tony.luck@intel.com>2007-07-20 11:26:47 -0700
committerTony Luck <tony.luck@intel.com>2007-07-20 11:26:47 -0700
commitc36c282b88963d0957368a443168588e62301fda (patch)
tree6343887ae42a65635a61b4ad99fd7f3e8dd24758 /Documentation
parentf4fbfb0dda5577075a049eec7fb7ad38abca1912 (diff)
parent1f564ad6d4182859612cbae452122e5eb2d62a76 (diff)
Pull ia64-clocksource into release branch
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt2
-rw-r--r--Documentation/time_interpolators.txt41
2 files changed, 2 insertions, 41 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 854744bde22..5fbe07706ae 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1154,6 +1154,8 @@ and is between 256 and 4096 characters. It is defined in the file
nointroute [IA-64]
+ nojitter [IA64] Disables jitter checking for ITC timers.
+
nolapic [IA-32,APIC] Do not enable or use the local APIC.
nolapic_timer [IA-32,APIC] Do not use the local APIC timer.
diff --git a/Documentation/time_interpolators.txt b/Documentation/time_interpolators.txt
deleted file mode 100644
index e3b60854fbc..00000000000
--- a/Documentation/time_interpolators.txt
+++ /dev/null
@@ -1,41 +0,0 @@
-Time Interpolators
-------------------
-
-Time interpolators are a base of time calculation between timer ticks and
-allow an accurate determination of time down to the accuracy of the time
-source in nanoseconds.
-
-The architecture specific code typically provides gettimeofday and
-settimeofday under Linux. The time interpolator provides both if an arch
-defines CONFIG_TIME_INTERPOLATION. The arch still must set up timer tick
-operations and call the necessary functions to advance the clock.
-
-With the time interpolator a standardized interface exists for time
-interpolation between ticks. The provided logic is highly scalable
-and has been tested in SMP situations of up to 512 CPUs.
-
-If CONFIG_TIME_INTERPOLATION is defined then the architecture specific code
-(or the device drivers - like HPET) may register time interpolators.
-These are typically defined in the following way:
-
-static struct time_interpolator my_interpolator {
- .frequency = MY_FREQUENCY,
- .source = TIME_SOURCE_MMIO32,
- .shift = 8, /* scaling for higher accuracy */
- .drift = -1, /* Unknown drift */
- .jitter = 0 /* time source is stable */
-};
-
-void time_init(void)
-{
- ....
- /* Initialization of the timer *.
- my_interpolator.address = &my_timer;
- register_time_interpolator(&my_interpolator);
- ....
-}
-
-For more details see include/linux/timex.h and kernel/timer.c.
-
-Christoph Lameter <christoph@lameter.com>, October 31, 2004
-