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The unit mentioned in the documentation of scheduler statistics is
outdated which may mislead the readers.
The unit of statistics that is reported by /proc/schedstat is modified
to nanosecond, and the unit of statistics that is reported by
/proc/PID/schedstat is provided as well to make the context consistent.
The rq_cpu_time and the rq_sched_info.run_delay of a run queue, and the
sched_info.run_delay of a task are all updated based on the clock of the
run queue, while the se.sum_exec_runtime of a task is updated based on
the clock_task of the run queue of the task. Both the clock and
clock_task are relied on the return value of the function sched_clock()
which is in the unit of nanosecond.
Signed-off-by: Jui-Tse Huang <juitse.huang@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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In the current implementation, cpu_time and rq_time should be
in nanoseconds, so this document needs to be modified.
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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The rain.com domain recently moved to pdxhosts.com, making the scheduler
documentation point to broken links. Fix the links in the scheduler
documentation.
CC: Rick Lindsley <ricklind@linux.vnet.ibm.com>
Signed-off-by: Andre Azevedo <andre.azevedo@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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In order to prepare to add them to the Kernel API book,
convert the files to ReST format.
The conversion is actually:
- add blank lines and identation in order to identify paragraphs;
- fix tables markups;
- add some lists markups;
- mark literal blocks;
- adjust title markups.
At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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