adulau/aha
1
0
Fork 0
mirror of https://github.com/adulau/aha.git synced 2024-12-27 03:06:10 +00:00
Code Issues Projects Releases Packages Wiki Activity

sched: Documentation/sched-rt-group: Fix style issues & bump version

Browse source 
- add missing closing bracket
- fix two 80-chars issues (as the rest of the document adheres to it)
- bump a reference to kernel version, so the document does not feel aged

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1245580359-4465-1-git-send-email-w.sang@pengutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Wolfram Sang 2009-06-21 12:32:39 +02:00 committed by Ingo Molnar
parent c277331d5f
commit d4ec36bac3
1 changed files with 7 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

13
Documentation/scheduler/sched-rt-group.txt
View file

@ -73,7 +73,7 @@ The remaining CPU time will be used for user input and other tasks. Because
realtime tasks have explicitly allocated the CPU time they need to perform realtime tasks have explicitly allocated the CPU time they need to perform
their tasks, buffer underruns in the graphics or audio can be eliminated. their tasks, buffer underruns in the graphics or audio can be eliminated.
NOTE: the above example is not fully implemented as of yet (2.6.25). We still NOTE: the above example is not fully implemented yet. We still
lack an EDF scheduler to make non-uniform periods usable. lack an EDF scheduler to make non-uniform periods usable.
@ -140,14 +140,15 @@ The other option is:
.o CONFIG_CGROUP_SCHED (aka "Basis for grouping tasks" = "Control groups") .o CONFIG_CGROUP_SCHED (aka "Basis for grouping tasks" = "Control groups")
This uses the /cgroup virtual file system and "/cgroup/<cgroup>/cpu.rt_runtime_us" This uses the /cgroup virtual file system and
to control the CPU time reserved for each control group instead. "/cgroup/<cgroup>/cpu.rt_runtime_us" to control the CPU time reserved for each
control group instead.
For more information on working with control groups, you should read For more information on working with control groups, you should read
Documentation/cgroups/cgroups.txt as well. Documentation/cgroups/cgroups.txt as well.
Group settings are checked against the following limits in order to keep the configuration Group settings are checked against the following limits in order to keep the
schedulable: configuration schedulable:
\Sum_{i} runtime_{i} / global_period <= global_runtime / global_period \Sum_{i} runtime_{i} / global_period <= global_runtime / global_period
@ -189,7 +190,7 @@ Implementing SCHED_EDF might take a while to complete. Priority Inheritance is
the biggest challenge as the current linux PI infrastructure is geared towards the biggest challenge as the current linux PI infrastructure is geared towards
the limited static priority levels 0-99. With deadline scheduling you need to the limited static priority levels 0-99. With deadline scheduling you need to
do deadline inheritance (since priority is inversely proportional to the do deadline inheritance (since priority is inversely proportional to the
deadline delta (deadline - now). deadline delta (deadline - now)).
This means the whole PI machinery will have to be reworked - and that is one of This means the whole PI machinery will have to be reworked - and that is one of
the most complex pieces of code we have. the most complex pieces of code we have.