linux-kernel - Re: [PATCH] docs/sched: Make the sched-stats documentation consistent

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Message-ID: <aBQnuv9JLOHYayiu@archie.me>
Date: Fri, 2 May 2025 09:02:34 +0700
From: Bagas Sanjaya <bagasdotme@...il.com>
To: Swapnil Sapkal <swapnil.sapkal@....com>, peterz@...radead.org,
	corbet@....net
Cc: kprateek.nayak@....com, gautham.shenoy@....com,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: Re: [PATCH] docs/sched: Make the sched-stats documentation consistent

On Wed, Apr 30, 2025 at 06:25:59AM +0000, Swapnil Sapkal wrote:
> diff --git a/Documentation/scheduler/sched-stats.rst b/Documentation/scheduler/sched-stats.rst
> index 08b6bc9a315c..ad68cf1c99e1 100644
> --- a/Documentation/scheduler/sched-stats.rst
> +++ b/Documentation/scheduler/sched-stats.rst
> @@ -86,13 +86,16 @@ Domain statistics
>  -----------------
>  One of these is produced per domain for each cpu described. (Note that if
>  CONFIG_SMP is not defined, *no* domains are utilized and these lines
> -will not appear in the output. <name> is an extension to the domain field
> -that prints the name of the corresponding sched domain. It can appear in
> -schedstat version 17 and above.
> +will not appear in the output.)
>  
>  domain<N> <name> <cpumask> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45
>  
> -The first field is a bit mask indicating what cpus this domain operates over.
> +The <name> field prints the name of the sched domain and is only supported
> +with schedstat version >= 17. On previous versions, <cpumask> is the first
> +field.
> +
> +The <cpumask> field is a bit mask indicating what cpus this domain operates
> +over.
>  
>  The next 33 are a variety of sched_balance_rq() statistics in grouped into types
>  of idleness (busy, idle and newly idle):
> @@ -103,12 +106,13 @@ of idleness (busy, idle and newly idle):
>          load did not require balancing when busy
>      3)  # of times in this domain sched_balance_rq() tried to move one or
>          more tasks and failed, when the cpu was busy
> -    4)  Total imbalance in load when the cpu was busy
> -    5)  Total imbalance in utilization when the cpu was busy
> -    6)  Total imbalance in number of tasks when the cpu was busy
> -    7)  Total imbalance due to misfit tasks when the cpu was busy
> -    8)  # of times in this domain pull_task() was called when busy
> -    9)  # of times in this domain pull_task() was called even though the
> +    4)  Total imbalance in load in this domain when the cpu was busy
> +    5)  Total imbalance in utilization in this domain when the cpu was busy
> +    6)  Total imbalance in number of tasks in this domain when the cpu was busy
> +    7)  Total imbalance due to misfit tasks in this domain when the cpu was
> +        busy
> +    8)  # of times in this domain detach_task() was called when busy
> +    9)  # of times in this domain detach_task() was called even though the
>          target task was cache-hot when busy
                           s/cache-hot/hot-cached/ maybe?
>      10) # of times in this domain sched_balance_rq() was called but did not
>          find a busier queue while the cpu was busy
> @@ -121,13 +125,14 @@ of idleness (busy, idle and newly idle):
>          the load did not require balancing when the cpu was idle
>      14) # of times in this domain sched_balance_rq() tried to move one or
>          more tasks and failed, when the cpu was idle
> -    15) Total imbalance in load when the cpu was idle
> -    16) Total imbalance in utilization when the cpu was idle
> -    17) Total imbalance in number of tasks when the cpu was idle
> -    18) Total imbalance due to misfit tasks when the cpu was idle
> -    19) # of times in this domain pull_task() was called when the cpu
> +    15) Total imbalance in load in this domain when the cpu was idle
> +    16) Total imbalance in utilization in this domain when the cpu was idle
> +    17) Total imbalance in number of tasks in this domain when the cpu was idle
> +    18) Total imbalance due to misfit tasks in this domain when the cpu was
> +        idle
> +    19) # of times in this domain detach_task() was called when the cpu
>          was idle
> -    20) # of times in this domain pull_task() was called even though
> +    20) # of times in this domain detach_task() was called even though
>          the target task was cache-hot when idle
>      21) # of times in this domain sched_balance_rq() was called but did
>          not find a busier queue while the cpu was idle
> @@ -140,12 +145,16 @@ of idleness (busy, idle and newly idle):
>          load did not require balancing when the cpu was just becoming idle
>      25) # of times in this domain sched_balance_rq() tried to move one or more
>          tasks and failed, when the cpu was just becoming idle
> -    26) Total imbalance in load when the cpu was just becoming idle
> -    27) Total imbalance in utilization when the cpu was just becoming idle
> -    28) Total imbalance in number of tasks when the cpu was just becoming idle
> -    29) Total imbalance due to misfit tasks when the cpu was just becoming idle
> -    30) # of times in this domain pull_task() was called when newly idle
> -    31) # of times in this domain pull_task() was called even though the
> +    26) Total imbalance in load in this domain when the cpu was just becoming
> +        idle
> +    27) Total imbalance in utilization in this domain when the cpu was just
> +        becoming idle
> +    28) Total imbalance in number of tasks in this domain when the cpu was just
> +        becoming idle
> +    29) Total imbalance due to misfit tasks in this domain when the cpu was
> +        just becoming idle
> +    30) # of times in this domain detach_task() was called when newly idle
> +    31) # of times in this domain detach_task() was called even though the
>          target task was cache-hot when just becoming idle
>      32) # of times in this domain sched_balance_rq() was called but did not
>          find a busier queue while the cpu was just becoming idle

The rest looks good.

Thanks.

-- 
An old man doll... just what I always wanted! - Clara

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