linux-kernel - Re: [PATCH 28/31] sched_ext: Add Documentation/scheduler/sched-ext.rst

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Date:   Mon, 12 Dec 2022 11:01:42 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     torvalds@...ux-foundation.org, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        bristot@...hat.com, vschneid@...hat.com, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, martin.lau@...nel.org,
        joshdon@...gle.com, brho@...gle.com, pjt@...gle.com,
        derkling@...gle.com, haoluo@...gle.com, dvernet@...a.com,
        dschatzberg@...a.com, dskarlat@...cmu.edu, riel@...riel.com,
        linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        linux-doc@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH 28/31] sched_ext: Add
 Documentation/scheduler/sched-ext.rst

On Tue, Nov 29, 2022 at 10:23:10PM -1000, Tejun Heo wrote:
> Signed-off-by: Tejun Heo <tj@...nel.org>
> Reviewed-by: David Vernet <dvernet@...a.com>
> Acked-by: Josh Don <joshdon@...gle.com>
> Acked-by: Hao Luo <haoluo@...gle.com>
> Acked-by: Barret Rhoden <brho@...gle.com>

No patch description? Really? Please write one.

For patch subject, better write "Documentation: scheduler: document
extensible scheduler class".

> +* The system integrity is maintained no matter what the BPF scheduler does.
> +  The default scheduling behavior is restored anytime an error is detected,
> +  a runnable task stalls, or on sysrq-S.
> +
> <snipped>...
> +Terminating the sched_ext scheduler program, triggering sysrq-S, or
> +detection of any internal error including stalled runnable tasks aborts the
> +BPF scheduler and reverts all tasks back to CFS.

IMO the reference to SysRq key can be reworded:

---- >8 ----
diff --git a/Documentation/scheduler/sched-ext.rst b/Documentation/scheduler/sched-ext.rst
index a2ad963b227a1b..404b820119b4a4 100644
--- a/Documentation/scheduler/sched-ext.rst
+++ b/Documentation/scheduler/sched-ext.rst
@@ -15,7 +15,8 @@ programs - the BPF scheduler.
 
 * The system integrity is maintained no matter what the BPF scheduler does.
   The default scheduling behavior is restored anytime an error is detected,
-  a runnable task stalls, or on sysrq-S.
+  a runnable task stalls, or on invoking SysRq key sequence like
+  :kbd:`SysRq-s`.
 
 Switching to and from sched_ext
 ===============================
@@ -35,7 +36,7 @@ case, all ``SCHED_NORMAL``, ``SCHED_BATCH``, ``SCHED_IDLE`` and
 ``SCHED_EXT`` tasks are scheduled by sched_ext. In the example schedulers,
 this mode can be selected with the ``-a`` option.
 
-Terminating the sched_ext scheduler program, triggering sysrq-S, or
+Terminating the sched_ext scheduler program, triggering SysRq key, or
 detection of any internal error including stalled runnable tasks aborts the
 BPF scheduler and reverts all tasks back to CFS.
 

> +A task is always *dispatch*ed to a dsq for execution. The task starts
> +execution when a CPU *consume*s the task from the dsq.

Sphinx reported two warnings:

Documentation/scheduler/sched-ext.rst:117: WARNING: Inline emphasis start-string without end-string.
Documentation/scheduler/sched-ext.rst:117: WARNING: Inline emphasis start-string without end-string.

I have to replace with quotes (since "dispatch" and "consume" have different
meaning in this context):

---- >8 ----
diff --git a/Documentation/scheduler/sched-ext.rst b/Documentation/scheduler/sched-ext.rst
index 81f78e05a6c214..a2ad963b227a1b 100644
--- a/Documentation/scheduler/sched-ext.rst
+++ b/Documentation/scheduler/sched-ext.rst
@@ -114,8 +114,8 @@ there is one global FIFO (``SCX_DSQ_GLOBAL``), and one local dsq per CPU
 (``SCX_DSQ_LOCAL``). The BPF scheduler can manage an arbitrary number of
 dsq's using ``scx_bpf_create_dsq()`` and ``scx_bpf_destroy_dsq()``.
 
-A task is always *dispatch*ed to a dsq for execution. The task starts
-execution when a CPU *consume*s the task from the dsq.
+A task is always "dispatched" to a dsq for execution. The task starts
+execution when a CPU "consumes" the task from the dsq.
 
 Internally, a CPU only executes tasks which are running on its local dsq,
 and the ``.consume()`` operation is in fact a transfer of a task from a

Otherwise the doc LGTM.

Thanks.

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

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