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0831-erts-Clarify-system_flag-scheduler_wall_ti...
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File 0831-erts-Clarify-system_flag-scheduler_wall_time-_-docs.patch of Package erlang
From 0e3db5dd1eb310519a5b5cd0d2da4acd1dab8177 Mon Sep 17 00:00:00 2001 From: Sverker Eriksson <sverker@erlang.org> Date: Mon, 22 Nov 2021 23:08:08 +0100 Subject: [PATCH 1/3] erts: Clarify system_flag(scheduler_wall_time,_) docs --- erts/doc/src/erlang.xml | 34 ++++++++++++++++++++++++++++++---- 1 file changed, 30 insertions(+), 4 deletions(-) diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml index 26f3f768f6..39c2095dc8 100644 --- a/erts/doc/src/erlang.xml +++ b/erts/doc/src/erlang.xml @@ -9350,10 +9350,36 @@ ok <fsummary>Set system flag scheduler_wall_time.</fsummary> <desc> <p> - Turns on or off scheduler wall time measurements.</p> - <p>For more information, see - <seeerl marker="#statistics_scheduler_wall_time"> - <c>statistics(scheduler_wall_time)</c></seeerl>.</p> + Try enable or disable scheduler wall time measurements by passing + <c><anno>Boolean</anno></c> as either <c>true</c> or <c>false</c>. + </p> + <p> + For more information about how to use scheduler wall time + measurements, see <seeerl marker="#statistics_scheduler_wall_time"> + <c>statistics(scheduler_wall_time)</c></seeerl>. + </p> + <p> + Scheduler wall time measurements has a node global state. It is either + enabled for all processes on the node or disabled for all + processes. Each process has a logical counter initialized as zero. A + call with <c><anno>Boolean</anno></c> as <c>true</c> will increase + that counter one step for the calling process. A call with + <c>false</c> will decrease it one step unless it already is + zero. The node global state for <c>scheduler_wall_time</c> will be + enabled as long as there is at least one process alive with a counter + value larger than zero. When a process terminates, its counter will + also disappear. To ensure <c>scheduler_wall_time</c> is kept enabled, + the process that enabled it must therefore be kept alive. + </p> + <p> + Returns the old value of the node global state, <c>true</c> if + scheduler wall time measurements were enabled, <c>false</c> + if it were disabled. + </p> + <p> + Scheduler wall time measurements do consume some cpu overhead and + should not be left turned on unless used. + </p> </desc> </func> -- 2.31.1
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