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Re: [PATCH v2 4/7] trace2: use system config for default trace2 settings

On 4/1/2019 5:00 PM, Josh Steadmon wrote:
On 2019.03.29 10:04, Jeff Hostetler via GitGitGadget wrote:
diff --git a/Documentation/technical/api-trace2.txt b/Documentation/technical/api-trace2.txt
index baaa1153bb..13ca595c69 100644
--- a/Documentation/technical/api-trace2.txt
+++ b/Documentation/technical/api-trace2.txt
@@ -117,6 +117,37 @@ values are recognized.
  Socket type can be either `stream` or `dgram`.  If the socket type is
  omitted, Git will try both.
+== Trace2 Settings in System Config
+Trace2 also reads configuration information from the system config.
+This is intended to help adminstrators to gather system-wide Git
+performance data.
+Trace2 only reads the system configuration, it does not read global,
+local, worktree, or `-c` config settings.
+Trace2 will try to load the following system configuration settings
+and then read the corresponding environment variables at startup.
+trace2.normalTarget          GIT_TR2
+trace2.normalBrief           GIT_TR2_BRIEF
+trace2.perfTarget            GIT_TR2_PERF
+trace2.perfBrief             GIT_TR2_PERF_BRIEF
+trace2.eventTarget           GIT_TR2_EVENT
+trace2.eventBrief            GIT_TR2_EVENT_BRIEF
+trace2.eventNesting          GIT_TR2_EVENT_NESTING
+trace2.configParams          GIT_TR2_CONFIG_PARAMS
+trace2.destinationDebug      GIT_TR2_DST_DEBUG

A question for the list: should these new config vars also be documented
in the git-config manpage, or is it better to keep these separate since
they are only read from the system config?

I wasn't sure either, so I just kept them in the trace2 api doc for now.