diff options
Diffstat (limited to 'lib/kernel/doc')
| -rw-r--r-- | lib/kernel/doc/src/kernel_app.xml | 37 | ||||
| -rw-r--r-- | lib/kernel/doc/src/notes.xml | 26 |
2 files changed, 63 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/kernel_app.xml b/lib/kernel/doc/src/kernel_app.xml index 2cea38bae9..956c57f7c1 100644 --- a/lib/kernel/doc/src/kernel_app.xml +++ b/lib/kernel/doc/src/kernel_app.xml @@ -43,6 +43,7 @@ <item><c>erl_boot_server</c></item> <item><c>erl_ddll</c></item> <item><c>error_logger</c></item> + <item><c>error_logger_format_depth</c></item> <item><c>file</c></item> <item><c>global</c></item> <item><c>global_group</c></item> @@ -152,6 +153,42 @@ </item> </taglist> </item> + <tag><c>error_logger_format_depth = Depth</c></tag> + <item> + <marker id="error_logger_format_depth"></marker> + <p>This parameter can be used to limit the size of the + formatted output from the error logger event handlers.</p> + + <note><p>This configuration parameter was introduced in OTP 18.1. + It is currently experimental. Based on user feedback it + may be changed or improved in future releases, for example + to gain better control over how to limit the size of the + formatted output. We have no plans to entirely remove this + new feature, unless it turns out to be completely + useless. In OTP 19, the default may be changed to limit the + formatted output.</p></note> + + <p><c>Depth</c> is a positive integer that is the maximum + depth to which terms are printed by the error logger event + handlers included in OTP. Specifically, the two event handlers + defined by the <c>Kernel</c> application and the two event + handlers in the <c>SASL</c> application will use this + configuration parameter. (If you have implemented you own + error handlers, this configuration parameter will have no + effect on them.)</p> + + <p>The way <c>Depth</c> is used, is that format strings + string passed to the event handlers will be rewritten. + The "~p" and "~w" format controls will be replaced with + "~P" and "~W", respectively, and <c>Depth</c> will be + used as the depth parameter. See + <seealso marker="stdlib:io#format/2">io:format/2</seealso>.</p> + + <note><p>A reasonable starting value for <c>Depth</c> is + <c>30</c>. You should test crashing various processes in your + application and examine the logs from the crashes, and then + either increase or decrease the value.</p></note> + </item> <tag><c>global_groups = [GroupTuple]</c></tag> <item> <p>Defines global groups, see diff --git a/lib/kernel/doc/src/notes.xml b/lib/kernel/doc/src/notes.xml index b8db22aba7..76db0c201f 100644 --- a/lib/kernel/doc/src/notes.xml +++ b/lib/kernel/doc/src/notes.xml @@ -31,6 +31,32 @@ </header> <p>This document describes the changes made to the Kernel application.</p> +<section><title>Kernel 4.1</title> + + <section><title>Improvements and New Features</title> + <list> + <item> + <p>A mechanism for limiting the amount of text that the + built-in error logger events will produce has been + introduced. It is useful for limiting both the size of + log files and the CPU time used to produce them.</p> + <p>This mechanism is experimental in the sense that it + may be changed if it turns out that it does not solve the + problem it is supposed to solve. In that case, there may + be backward incompatible improvements to this + mechanism.</p> + <p>See the documentation for the config parameter + <c>error_logger_format_depth</c> in the Kernel + application for information about how to turn on this + feature.</p> + <p> + Own Id: OTP-12864</p> + </item> + </list> + </section> + +</section> + <section><title>Kernel 4.0</title> <section><title>Fixed Bugs and Malfunctions</title> |