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Date: Fri, 15 Apr 2022 11:36:18 +0800 From: Jui-Tse Huang <juitse.huang@...il.com> To: Jonathan Corbet <corbet@....net>, Peter Zijlstra <peterz@...radead.org>, Valentin Schneider <valentin.schneider@....com>, Mauro Carvalho Chehab <mchehab+huawei@...nel.org>, Huaixin Chang <changhuaixin@...ux.alibaba.com>, Beata Michalska <beata.michalska@....com>, Chun-Hung Tseng <henrybear327@...il.com>, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Jui-Tse Huang <juitse.huang@...il.com>, Ching-Chun Huang <jserv@...s.ncku.edu.tw> Subject: [PATCH] docs/scheduler: fix unit error The unit mentioned in the documentation of scheduler statistics is outdated which may mislead the readers.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@...il.com> --- Documentation/scheduler/sched-stats.rst | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/Documentation/scheduler/sched-stats.rst b/Documentation/scheduler/sched-stats.rst index dd9b99a025f7..03c062915998 100644 --- a/Documentation/scheduler/sched-stats.rst +++ b/Documentation/scheduler/sched-stats.rst @@ -56,9 +56,9 @@ Next two are try_to_wake_up() statistics: Next three are statistics describing scheduling latency: - 7) sum of all time spent running by tasks on this processor (in jiffies) + 7) sum of all time spent running by tasks on this processor (in nanoseconds) 8) sum of all time spent waiting to run by tasks on this processor (in - jiffies) + nanoseconds) 9) # of timeslices run on this cpu @@ -155,8 +155,8 @@ schedstats also adds a new /proc/<pid>/schedstat file to include some of the same information on a per-process level. There are three fields in this file correlating for that process to: - 1) time spent on the cpu - 2) time spent waiting on a runqueue + 1) time spent on the cpu (in nanoseconds) + 2) time spent waiting on a runqueue (in nanoseconds) 3) # of timeslices run on this cpu A program could be easily written to make use of these extra fields to -- 2.25.1
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