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Merge pull request #2782 from grahamc/flames

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Track function start and end
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Eelco Dolstra 2019-08-15 14:20:42 +02:00 • committed by GitHub
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28
doc/manual/command-ref/conf-file.xml
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@ -981,6 +981,34 @@ requiredSystemFeatures = [ "kvm" ];
</varlistentry>
<varlistentry xml:id="conf-trace-function-calls"><term><literal>trace-function-calls</literal></term>
<listitem>
<para>Default: <literal>false</literal>.</para>
<para>If set to <literal>true</literal>, the Nix evaluator will
trace every function call. Nix will print a log message at the
"vomit" level for every function entrance and function exit.</para>
<informalexample><screen>
function-trace entered undefined position at 1565795816999559622
function-trace exited undefined position at 1565795816999581277
function-trace entered /nix/store/.../example.nix:226:41 at 1565795253249935150
function-trace exited /nix/store/.../example.nix:226:41 at 1565795253249941684
</screen></informalexample>
<para>The <literal>undefined position</literal> means the function
call is a builtin.</para>
<para>Use the <literal>contrib/stack-collapse.py</literal> script
distributed with the Nix source code to convert the trace logs
in to a format suitable for <command>flamegraph.pl</command>.</para>
</listitem>
</varlistentry>
<varlistentry xml:id="conf-trusted-public-keys"><term><literal>trusted-public-keys</literal></term>
<listitem><para>A whitespace-separated list of public keys. When