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trace2: update docs to describe system/global config settings
Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler
Junio C Hamano
parent
08881b9a4c
commit
81567caf87
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@ -422,6 +422,8 @@ include::config/submodule.txt[]
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include::config/tag.txt[]
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include::config/trace2.txt[]
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include::config/transfer.txt[]
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include::config/uploadarchive.txt[]
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56
Documentation/config/trace2.txt
Normal file
56
Documentation/config/trace2.txt
Normal file
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@ -0,0 +1,56 @@
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Trace2 config settings are only read from the system and global
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config files; repository local and worktree config files and `-c`
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command line arguments are not respected.
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trace2.normalTarget::
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This variable controls the normal target destination.
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It may be overridden by the `GIT_TR2` environment variable.
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The following table shows possible values.
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trace2.perfTarget::
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This variable controls the performance target destination.
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It may be overridden by the `GIT_TR2_PERF` environment variable.
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The following table shows possible values.
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trace2.eventTarget::
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This variable controls the event target destination.
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It may be overridden by the `GIT_TR2_EVENT` environment variable.
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The following table shows possible values.
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+
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include::../trace2-target-values.txt[]
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trace2.normalBrief::
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Boolean. When true `time`, `filename`, and `line` fields are
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omitted from normal output. May be overridden by the
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`GIT_TR2_BRIEF` environment variable. Defaults to false.
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trace2.perfBrief::
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Boolean. When true `time`, `filename`, and `line` fields are
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omitted from PERF output. May be overridden by the
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`GIT_TR2_PERF_BRIEF` environment variable. Defaults to false.
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trace2.eventBrief::
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Boolean. When true `time`, `filename`, and `line` fields are
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omitted from event output. May be overridden by the
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`GIT_TR2_EVENT_BRIEF` environment variable. Defaults to false.
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trace2.eventNesting::
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Integer. Specifies desired depth of nested regions in the
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event output. Regions deeper than this value will be
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omitted. May be overridden by the `GIT_TR2_EVENT_NESTING`
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environment variable. Defaults to 2.
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trace2.configParams::
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A comma-separated list of patterns of "important" config
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settings that should be recorded in the trace2 output.
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For example, `core.*,remote.*.url` would cause the trace2
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output to contain events listing each configured remote.
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May be overridden by the `GIT_TR2_CONFIG_PARAMS` environment
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variable. Unset by default.
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trace2.destinationDebug::
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Boolean. When true Git will print error messages when a
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trace target destination cannot be opened for writing.
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By default, these errors are suppressed and tracing is
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silently disabled. May be overridden by the
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`GIT_TR2_DST_DEBUG` environment variable.
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@ -22,21 +22,41 @@ Targets are defined using a VTable allowing easy extension to other
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formats in the future. This might be used to define a binary format,
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for example.
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Trace2 is controlled using `trace2.*` config values in the system and
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global config files and `GIT_TR2*` environment variables. Trace2 does
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not read from repo local or worktree config files or respect `-c`
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command line config settings.
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== Trace2 Targets
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Trace2 defines the following set of Trace2 Targets.
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Format details are given in a later section.
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`GIT_TR2` (NORMAL)::
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=== The Normal Format Target
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The normal format target is a tradition printf format and similar
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to GIT_TRACE format. This format is enabled with the `GIT_TR`
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environment variable or the `trace2.normalTarget` system or global
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config setting.
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For example
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a simple printf format like GIT_TRACE.
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+
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------------
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$ export GIT_TR2=~/log.normal
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$ git version
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git version 2.20.1.155.g426c96fcdb
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------------
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+
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or
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------------
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$ git config --global trace2.normalTarget ~/log.normal
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$ git version
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git version 2.20.1.155.g426c96fcdb
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------------
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yields
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------------
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$ cat ~/log.normal
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12:28:42.620009 common-main.c:38 version 2.20.1.155.g426c96fcdb
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@ -46,17 +66,32 @@ $ cat ~/log.normal
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12:28:42.621250 trace2/tr2_tgt_normal.c:124 atexit elapsed:0.001265 code:0
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------------
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`GIT_TR2_PERF` (PERF)::
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=== The Performance Format Target
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The performance format target (PERF) is a column-based format to
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replace GIT_TRACE_PERFORMANCE and is suitable for development and
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testing, possibly to complement tools like gprof. This format is
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enabled with the `GIT_TR2_PERF` environment variable or the
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`trace2.perfTarget` system or global config setting.
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For example
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a column-based format to replace GIT_TRACE_PERFORMANCE suitable for
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development and testing, possibly to complement tools like gprof.
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+
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------------
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$ export GIT_TR2_PERF=~/log.perf
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$ git version
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git version 2.20.1.155.g426c96fcdb
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------------
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+
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or
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------------
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$ git config --global trace2.perfTarget ~/log.perf
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$ git version
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git version 2.20.1.155.g426c96fcdb
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------------
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yields
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------------
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$ cat ~/log.perf
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12:28:42.620675 common-main.c:38 | d0 | main | version | | | | | 2.20.1.155.g426c96fcdb
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@ -66,56 +101,46 @@ $ cat ~/log.perf
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12:28:42.621259 trace2/tr2_tgt_perf.c:211 | d0 | main | atexit | | 0.001265 | | | code:0
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------------
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`GIT_TR2_EVENT` (EVENT)::
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=== The Event Format Target
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The event format target is a JSON-based format of event data suitable
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for telemetry analysis. This format is enabled with the `GIT_TR2_EVENT`
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environment variable or the `trace2.eventTarget` system or global config
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setting.
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For example
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a JSON-based format of event data suitable for telemetry analysis.
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+
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------------
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$ export GIT_TR2_EVENT=~/log.event
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$ git version
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git version 2.20.1.155.g426c96fcdb
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------------
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+
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or
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------------
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$ git config --global trace2.eventTarget ~/log.event
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$ git version
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git version 2.20.1.155.g426c96fcdb
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------------
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yields
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------------
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$ cat ~/log.event
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{"event":"version","sid":"sid":"20190408T191610.507018Z-H9b68c35f-P028492","thread":"main","time":"2019-01-16T17:28:42.620713Z","file":"common-main.c","line":38,"evt":"1","exe":"2.20.1.155.g426c96fcdb"}
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{"event":"start","sid":"20190408T191610.507018Z-H9b68c35f-P028492","thread":"main","time":"2019-01-16T17:28:42.621027Z","file":"common-main.c","line":39,"t_abs":0.001173,"argv":["git","version"]}
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{"event":"cmd_name","sid":"20190408T191610.507018Z-H9b68c35f-P028492","thread":"main","time":"2019-01-16T17:28:42.621122Z","file":"git.c","line":432,"name":"version","hierarchy":"version"}
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{"event":"exit","sid":"20190408T191610.507018Z-H9b68c35f-P028492","thread":"main","time":"2019-01-16T17:28:42.621236Z","file":"git.c","line":662,"t_abs":0.001227,"code":0}
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{"event":"atexit","sid":"20190408T191610.507018Z-H9b68c35f-P028492","thread":"main","time":"2019-01-16T17:28:42.621268Z","file":"trace2/tr2_tgt_event.c","line":163,"t_abs":0.001265,"code":0}
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{"event":"version","sid":"sid":"20190408T191610.507018Z-H9b68c35f-P000059a8","thread":"main","time":"2019-01-16T17:28:42.620713Z","file":"common-main.c","line":38,"evt":"1","exe":"2.20.1.155.g426c96fcdb"}
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{"event":"start","sid":"20190408T191610.507018Z-H9b68c35f-P000059a8","thread":"main","time":"2019-01-16T17:28:42.621027Z","file":"common-main.c","line":39,"t_abs":0.001173,"argv":["git","version"]}
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{"event":"cmd_name","sid":"20190408T191610.507018Z-H9b68c35f-P000059a8","thread":"main","time":"2019-01-16T17:28:42.621122Z","file":"git.c","line":432,"name":"version","hierarchy":"version"}
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{"event":"exit","sid":"20190408T191610.507018Z-H9b68c35f-P000059a8","thread":"main","time":"2019-01-16T17:28:42.621236Z","file":"git.c","line":662,"t_abs":0.001227,"code":0}
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{"event":"atexit","sid":"20190408T191610.507018Z-H9b68c35f-P000059a8","thread":"main","time":"2019-01-16T17:28:42.621268Z","file":"trace2/tr2_tgt_event.c","line":163,"t_abs":0.001265,"code":0}
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------------
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== Enabling a Target
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=== Enabling a Target
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A Trace2 Target is enabled when the corresponding environment variable
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(`GIT_TR2`, `GIT_TR2_PERF`, or `GIT_TR2_EVENT`) is set. The following
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values are recognized.
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To enable a target, set the corresponding environment variable or
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system or global config value to one of the following:
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`0`::
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`false`::
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Disables the target.
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`1`::
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`true`::
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Enables the target and writes stream to `STDERR`.
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`[2-9]`::
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Enables the target and writes to the already opened file descriptor.
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`<absolute-pathname>`::
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Enables the target, opens and writes to the file in append mode.
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`af_unix:[<socket_type>:]<absolute-pathname>`::
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Enables the target, opens and writes to a Unix Domain Socket
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(on platforms that support them).
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+
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Socket type can be either `stream` or `dgram`. If the socket type is
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omitted, Git will try both.
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include::../trace2-target-values.txt[]
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== Trace2 API
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@ -243,15 +268,16 @@ significantly affects program performance or behavior, such as
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Emits a "def_param" messages for "important" configuration
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settings.
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+
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The environment variable `GIT_TR2_CONFIG_PARAMS` can be set to a
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The environment variable `GIT_TR2_CONFIG_PARAMS` or the `trace2.configParams`
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config value can be set to a
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list of patterns of important configuration settings, for example:
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`core.*,remote.*.url`. This function will iterate over all config
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settings and emit a "def_param" message for each match.
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`void trace2_cmd_set_config(const char *key, const char *value)`::
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Emits a "def_param" message for a specific configuration
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setting IFF it matches the `GIT_TR2_CONFIG_PARAMS` pattern.
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Emits a "def_param" message for a new or updated key/value
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pair IF `key` is considered important.
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+
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This is used to hook into `git_config_set()` and catch any
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configuration changes and update a value previously reported by
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@ -418,9 +444,6 @@ recursive tree walk.
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=== NORMAL Format
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NORMAL format is enabled when the `GIT_TR2` environment variable is
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set.
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Events are written as lines of the form:
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------------
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@ -437,8 +460,8 @@ Events are written as lines of the form:
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Note that this may contain embedded LF or CRLF characters that are
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not escaped, so the event may spill across multiple lines.
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If `GIT_TR2_BRIEF` is true, the `time`, `filename`, and `line` fields
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are omitted.
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If `GIT_TR2_BRIEF` or `trace2.normalBrief` is true, the `time`, `filename`,
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and `line` fields are omitted.
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This target is intended to be more of a summary (like GIT_TRACE) and
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less detailed than the other targets. It ignores thread, region, and
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@ -446,9 +469,6 @@ data messages, for example.
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=== PERF Format
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PERF format is enabled when the `GIT_TR2_PERF` environment variable
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is set.
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Events are written as lines of the form:
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------------
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@ -508,8 +528,8 @@ This field is in anticipation of in-proc submodules in the future.
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15:33:33.532712 wt-status.c:2331 | d0 | main | region_leave | r1 | 0.127568 | 0.001504 | status | label:print
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------------
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If `GIT_TR2_PERF_BRIEF` is true, the `time`, `file`, and `line`
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fields are omitted.
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If `GIT_TR2_PERF_BRIEF` or `trace2.perfBrief` is true, the `time`, `file`,
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and `line` fields are omitted.
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------------
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d0 | main | region_leave | r1 | 0.011717 | 0.009122 | index | label:preload
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@ -520,9 +540,6 @@ during development and is quite noisy.
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=== EVENT Format
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EVENT format is enabled when the `GIT_TR2_EVENT` environment
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variable is set.
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Each event is a JSON-object containing multiple key/value pairs
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written as a single line and followed by a LF.
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@ -540,7 +557,7 @@ The following key/value pairs are common to all events:
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------------
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{
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"event":"version",
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"sid":"20190408T191827.272759Z-H9b68c35f-P011764",
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"sid":"20190408T191827.272759Z-H9b68c35f-P00003510",
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"thread":"main",
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"time":"2019-04-08T19:18:27.282761Z",
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"file":"common-main.c",
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@ -576,9 +593,9 @@ The following key/value pairs are common to all events:
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`"repo":<repo-id>`::
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when present, is the integer repo-id as described previously.
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If `GIT_TR2_EVENT_BRIEF` is true, the `file` and `line` fields are omitted
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from all events and the `time` field is only present on the "start" and
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"atexit" events.
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If `GIT_TR2_EVENT_BRIEF` or `trace2.eventBrief` is true, the `file`
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and `line` fields are omitted from all events and the `time` field is
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only present on the "start" and "atexit" events.
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==== Event-Specific Key/Value Pairs
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@ -889,7 +906,7 @@ visited.
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The `category` field may be used in a future enhancement to
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do category-based filtering.
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+
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The `GIT_TR2_EVENT_NESTING` environment variable can be used to
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`GIT_TR2_EVENT_NESTING` or `trace2.eventNesting` can be used to
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filter deeply nested regions and data events. It defaults to "2".
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`"region_leave"`::
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10
Documentation/trace2-target-values.txt
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10
Documentation/trace2-target-values.txt
Normal file
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@ -0,0 +1,10 @@
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--
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* `0` or `false` - Disables the target.
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* `1` or `true` - Writes to `STDERR`.
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* `[2-9]` - Writes to the already opened file descriptor.
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* `<absolute-pathname>` - Writes to the file in append mode.
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* `af_unix:[<socket_type>:]<absolute-pathname>` - Write to a
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Unix DomainSocket (on platforms that support them). Socket
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type can be either `stream` or `dgram`; if omitted Git will
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try both.
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--
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