diff options
author | Tony Luck <tony.luck@intel.com> | 2007-07-20 14:26:47 -0400 |
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committer | Tony Luck <tony.luck@intel.com> | 2007-07-20 14:26:47 -0400 |
commit | c36c282b88963d0957368a443168588e62301fda (patch) | |
tree | 6343887ae42a65635a61b4ad99fd7f3e8dd24758 /Documentation | |
parent | f4fbfb0dda5577075a049eec7fb7ad38abca1912 (diff) | |
parent | 1f564ad6d4182859612cbae452122e5eb2d62a76 (diff) |
Pull ia64-clocksource into release branch
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/kernel-parameters.txt | 2 | ||||
-rw-r--r-- | Documentation/time_interpolators.txt | 41 |
2 files changed, 2 insertions, 41 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 854744bde224..5fbe07706ae9 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 | |||
1154 | 1154 | ||
1155 | nointroute [IA-64] | 1155 | nointroute [IA-64] |
1156 | 1156 | ||
1157 | nojitter [IA64] Disables jitter checking for ITC timers. | ||
1158 | |||
1157 | nolapic [IA-32,APIC] Do not enable or use the local APIC. | 1159 | nolapic [IA-32,APIC] Do not enable or use the local APIC. |
1158 | 1160 | ||
1159 | nolapic_timer [IA-32,APIC] Do not use the local APIC timer. | 1161 | 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 e3b60854fbc2..000000000000 --- a/Documentation/time_interpolators.txt +++ /dev/null | |||
@@ -1,41 +0,0 @@ | |||
1 | Time Interpolators | ||
2 | ------------------ | ||
3 | |||
4 | Time interpolators are a base of time calculation between timer ticks and | ||
5 | allow an accurate determination of time down to the accuracy of the time | ||
6 | source in nanoseconds. | ||
7 | |||
8 | The architecture specific code typically provides gettimeofday and | ||
9 | settimeofday under Linux. The time interpolator provides both if an arch | ||
10 | defines CONFIG_TIME_INTERPOLATION. The arch still must set up timer tick | ||
11 | operations and call the necessary functions to advance the clock. | ||
12 | |||
13 | With the time interpolator a standardized interface exists for time | ||
14 | interpolation between ticks. The provided logic is highly scalable | ||
15 | and has been tested in SMP situations of up to 512 CPUs. | ||
16 | |||
17 | If CONFIG_TIME_INTERPOLATION is defined then the architecture specific code | ||
18 | (or the device drivers - like HPET) may register time interpolators. | ||
19 | These are typically defined in the following way: | ||
20 | |||
21 | static struct time_interpolator my_interpolator { | ||
22 | .frequency = MY_FREQUENCY, | ||
23 | .source = TIME_SOURCE_MMIO32, | ||
24 | .shift = 8, /* scaling for higher accuracy */ | ||
25 | .drift = -1, /* Unknown drift */ | ||
26 | .jitter = 0 /* time source is stable */ | ||
27 | }; | ||
28 | |||
29 | void time_init(void) | ||
30 | { | ||
31 | .... | ||
32 | /* Initialization of the timer *. | ||
33 | my_interpolator.address = &my_timer; | ||
34 | register_time_interpolator(&my_interpolator); | ||
35 | .... | ||
36 | } | ||
37 | |||
38 | For more details see include/linux/timex.h and kernel/timer.c. | ||
39 | |||
40 | Christoph Lameter <christoph@lameter.com>, October 31, 2004 | ||
41 | |||