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Viewing changes to Documentation/scheduler/sched-design-CFS.txt

  • Committer: Bazaar Package Importer
  • Author(s): Paolo Pisati
  • Date: 2011-06-29 15:23:51 UTC
  • mfrom: (26.1.1 natty-proposed)
  • Revision ID: james.westby@ubuntu.com-20110629152351-xs96tm303d95rpbk
Tags: 3.0.0-1200.2
* Rebased against 3.0.0-6.7
* BSP from TI based on 3.0.0

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Documentation/scheduler/sched-design-CFS.txt
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   It puts the scheduling entity (task) into the red-black tree and
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   increments the nr_running variable.
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 - dequeue_tree(...)
 
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 - dequeue_task(...)
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   When a task is no longer runnable, this function is called to keep the
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   corresponding scheduling entity out of the red-black tree.  It decrements
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   This function is mostly called from time tick functions; it might lead to
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   process switch.  This drives the running preemption.
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 - task_new(...)
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   The core scheduler gives the scheduling module an opportunity to manage new
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   task startup.  The CFS scheduling module uses it for group scheduling, while
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   the scheduling module for a real-time task does not use it.
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group created using the pseudo filesystem.  See example steps below to create
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task groups and modify their CPU share using the "cgroups" pseudo filesystem.
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        # mkdir /dev/cpuctl
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        # mount -t cgroup -ocpu none /dev/cpuctl
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        # cd /dev/cpuctl
 
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        # mount -t tmpfs cgroup_root /sys/fs/cgroup
 
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        # mkdir /sys/fs/cgroup/cpu
 
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        # mount -t cgroup -ocpu none /sys/fs/cgroup/cpu
 
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        # cd /sys/fs/cgroup/cpu
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        # mkdir multimedia      # create "multimedia" group of tasks
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        # mkdir browser         # create "browser" group of tasks