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authorLinus Torvalds <torvalds@linux-foundation.org>2009-07-16 10:18:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-07-16 10:18:29 -0700
commit4b0a84043e0c14088958fddb62f416d050368011 (patch)
treecf5df6cef66a178c35e335240a756798caf2c399 /Documentation
parent63f7a330014ad29b662638caabd8e96fe945b9ed (diff)
parentd07387b490b1c43bfcb9f3900faf96f2dafb2630 (diff)
downloadop-kernel-dev-4b0a84043e0c14088958fddb62f416d050368011.zip
op-kernel-dev-4b0a84043e0c14088958fddb62f416d050368011.tar.gz
Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-sched
* 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/peterz/linux-2.6-sched: sched: Fix bug in SCHED_IDLE interaction with group scheduling sched: Fix rt_rq->pushable_tasks initialization in init_rt_rq() sched: Reset sched stats on fork() sched_rt: Fix overload bug on rt group scheduling sched: Documentation/sched-rt-group: Fix style issues & bump version
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/scheduler/sched-rt-group.txt13
1 files changed, 7 insertions, 6 deletions
diff --git a/Documentation/scheduler/sched-rt-group.txt b/Documentation/scheduler/sched-rt-group.txt
index 1df7f9c..86eabe6 100644
--- a/Documentation/scheduler/sched-rt-group.txt
+++ b/Documentation/scheduler/sched-rt-group.txt
@@ -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
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.
@@ -140,14 +140,15 @@ The other option is:
.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"
-to control the CPU time reserved for each control group instead.
+This uses the /cgroup virtual file system and
+"/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
Documentation/cgroups/cgroups.txt as well.
-Group settings are checked against the following limits in order to keep the configuration
-schedulable:
+Group settings are checked against the following limits in order to keep the
+configuration schedulable:
\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 limited static priority levels 0-99. With deadline scheduling you need to
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
the most complex pieces of code we have.
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