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authorjohn stultz <johnstul@us.ibm.com>2006-06-26 00:25:05 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:20 -0700
commit734efb467b31e56c2f9430590a9aa867ecf3eea1 (patch)
tree30bf6b52d1e67128e656fb9a01cd7e6e13b7755e /Documentation
parentade1a29e168ba08b699a418ff5e762315fa33f70 (diff)
[PATCH] Time: Clocksource Infrastructure
This introduces the clocksource management infrastructure. A clocksource is a driver-like architecture generic abstraction of a free-running counter. This code defines the clocksource structure, and provides management code for registering, selecting, accessing and scaling clocksources. Additionally, this includes the trivial jiffies clocksource, a lowest common denominator clocksource, provided mainly for use as an example. [hirofumi@mail.parknet.co.jp: Don't enable IRQ too early] Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/kernel-parameters.txt14
1 files changed, 10 insertions, 4 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index bca6f389da6..968631678d4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -61,6 +61,7 @@ parameter is applicable:
MTD MTD support is enabled.
NET Appropriate network support is enabled.
NUMA NUMA support is enabled.
+ GENERIC_TIME The generic timeofday code is enabled.
NFS Appropriate NFS support is enabled.
OSS OSS sound support is enabled.
PARIDE The ParIDE subsystem is enabled.
@@ -341,10 +342,11 @@ running once the system is up.
Value can be changed at runtime via
/selinux/checkreqprot.
- clock= [BUGS=IA-32,HW] gettimeofday timesource override.
- Forces specified timesource (if avaliable) to be used
- when calculating gettimeofday(). If specicified
- timesource is not avalible, it defaults to PIT.
+ clock= [BUGS=IA-32, HW] gettimeofday clocksource override.
+ [Deprecated]
+ Forces specified clocksource (if avaliable) to be used
+ when calculating gettimeofday(). If specified
+ clocksource is not avalible, it defaults to PIT.
Format: { pit | tsc | cyclone | pmtmr }
disable_8254_timer
@@ -1617,6 +1619,10 @@ running once the system is up.
time Show timing data prefixed to each printk message line
+ clocksource= [GENERIC_TIME] Override the default clocksource
+ Override the default clocksource and use the clocksource
+ with the name specified.
+
tipar.timeout= [HW,PPT]
Set communications timeout in tenths of a second
(default 15).