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-rw-r--r--Documentation/technical/api-trace2.txt284
1 files changed, 38 insertions, 246 deletions
diff --git a/Documentation/technical/api-trace2.txt b/Documentation/technical/api-trace2.txt
index fd1e628944..4f07ceadcb 100644
--- a/Documentation/technical/api-trace2.txt
+++ b/Documentation/technical/api-trace2.txt
@@ -35,7 +35,7 @@ Format details are given in a later section.
=== The Normal Format Target
The normal format target is a tradition printf format and similar
-to GIT_TRACE format. This format is enabled with the `GIT_TR`
+to GIT_TRACE format. This format is enabled with the `GIT_TRACE2`
environment variable or the `trace2.normalTarget` system or global
config setting.
@@ -128,7 +128,7 @@ yields
------------
$ cat ~/log.event
-{"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"}
+{"event":"version","sid":"sid":"20190408T191610.507018Z-H9b68c35f-P000059a8","thread":"main","time":"2019-01-16T17:28:42.620713Z","file":"common-main.c","line":38,"evt":"2","exe":"2.20.1.155.g426c96fcdb"}
{"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"]}
{"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"}
{"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}
@@ -142,10 +142,9 @@ system or global config value to one of the following:
include::../trace2-target-values.txt[]
-If the target already exists and is a directory, the traces will be
-written to files (one per process) underneath the given directory. They
-will be named according to the last component of the SID (optionally
-followed by a counter to avoid filename collisions).
+When trace files are written to a target directory, they will be named according
+to the last component of the SID (optionally followed by a counter to avoid
+filename collisions).
== Trace2 API
@@ -179,7 +178,7 @@ describe the simplified forms.
== Public API
-All Trace2 API functions send a messsage to all of the active
+All Trace2 API functions send a message to all of the active
Trace2 Targets. This section describes the set of available
messages.
@@ -189,261 +188,36 @@ purposes.
=== Basic Command Messages
These are concerned with the lifetime of the overall git process.
-
-`void trace2_initialize_clock()`::
-
- Initialize the Trace2 start clock and nothing else. This should
- be called at the very top of main() to capture the process start
- time and reduce startup order dependencies.
-
-`void trace2_initialize()`::
-
- Determines if any Trace2 Targets should be enabled and
- initializes the Trace2 facility. This includes setting up the
- Trace2 thread local storage (TLS).
-+
-This function emits a "version" message containing the version of git
-and the Trace2 protocol.
-+
-This function should be called from `main()` as early as possible in
-the life of the process after essential process initialization.
-
-`int trace2_is_enabled()`::
-
- Returns 1 if Trace2 is enabled (at least one target is
- active).
-
-`void trace2_cmd_start(int argc, const char **argv)`::
-
- Emits a "start" message containing the process command line
- arguments.
-
-`int trace2_cmd_exit(int exit_code)`::
-
- Emits an "exit" message containing the process exit-code and
- elapsed time.
-+
-Returns the exit-code.
-
-`void trace2_cmd_error(const char *fmt, va_list ap)`::
-
- Emits an "error" message containing a formatted error message.
-
-`void trace2_cmd_path(const char *pathname)`::
-
- Emits a "cmd_path" message with the full pathname of the
- current process.
+e.g: `void trace2_initialize_clock()`, `void trace2_initialize()`,
+`int trace2_is_enabled()`, `void trace2_cmd_start(int argc, const char **argv)`.
=== Command Detail Messages
These are concerned with describing the specific Git command
after the command line, config, and environment are inspected.
-
-`void trace2_cmd_name(const char *name)`::
-
- Emits a "cmd_name" message with the canonical name of the
- command, for example "status" or "checkout".
-
-`void trace2_cmd_mode(const char *mode)`::
-
- Emits a "cmd_mode" message with a qualifier name to further
- describe the current git command.
-+
-This message is intended to be used with git commands having multiple
-major modes. For example, a "checkout" command can checkout a new
-branch or it can checkout a single file, so the checkout code could
-emit a cmd_mode message of "branch" or "file".
-
-`void trace2_cmd_alias(const char *alias, const char **argv_expansion)`::
-
- Emits an "alias" message containing the alias used and the
- argument expansion.
-
-`void trace2_def_param(const char *parameter, const char *value)`::
-
- Emits a "def_param" message containing a key/value pair.
-+
-This message is intended to report some global aspect of the current
-command, such as a configuration setting or command line switch that
-significantly affects program performance or behavior, such as
-`core.abbrev`, `status.showUntrackedFiles`, or `--no-ahead-behind`.
-
-`void trace2_cmd_list_config()`::
-
- Emits a "def_param" messages for "important" configuration
- settings.
-+
-The environment variable `GIT_TRACE2_CONFIG_PARAMS` or the `trace2.configParams`
-config value can be set to a
-list of patterns of important configuration settings, for example:
-`core.*,remote.*.url`. This function will iterate over all config
-settings and emit a "def_param" message for each match.
-
-`void trace2_cmd_set_config(const char *key, const char *value)`::
-
- Emits a "def_param" message for a new or updated key/value
- pair IF `key` is considered important.
-+
-This is used to hook into `git_config_set()` and catch any
-configuration changes and update a value previously reported by
-`trace2_cmd_list_config()`.
-
-`void trace2_def_repo(struct repository *repo)`::
-
- Registers a repository with the Trace2 layer. Assigns a
- unique "repo-id" to `repo->trace2_repo_id`.
-+
-Emits a "worktree" messages containing the repo-id and the worktree
-pathname.
-+
-Region and data messages (described later) may refer to this repo-id.
-+
-The main/top-level repository will have repo-id value 1 (aka "r1").
-+
-The repo-id field is in anticipation of future in-proc submodule
-repositories.
+e.g: `void trace2_cmd_name(const char *name)`,
+`void trace2_cmd_mode(const char *mode)`.
=== Child Process Messages
These are concerned with the various spawned child processes,
including shell scripts, git commands, editors, pagers, and hooks.
-`void trace2_child_start(struct child_process *cmd)`::
-
- Emits a "child_start" message containing the "child-id",
- "child-argv", and "child-classification".
-+
-Before calling this, set `cmd->trace2_child_class` to a name
-describing the type of child process, for example "editor".
-+
-This function assigns a unique "child-id" to `cmd->trace2_child_id`.
-This field is used later during the "child_exit" message to associate
-it with the "child_start" message.
-+
-This function should be called before spawning the child process.
-
-`void trace2_child_exit(struct child_proess *cmd, int child_exit_code)`::
-
- Emits a "child_exit" message containing the "child-id",
- the child's elapsed time and exit-code.
-+
-The reported elapsed time includes the process creation overhead and
-time spend waiting for it to exit, so it may be slightly longer than
-the time reported by the child itself.
-+
-This function should be called after reaping the child process.
-
-`int trace2_exec(const char *exe, const char **argv)`::
-
- Emits a "exec" message containing the "exec-id" and the
- argv of the new process.
-+
-This function should be called before calling one of the `exec()`
-variants, such as `execvp()`.
-+
-This function returns a unique "exec-id". This value is used later
-if the exec() fails and a "exec-result" message is necessary.
-
-`void trace2_exec_result(int exec_id, int error_code)`::
-
- Emits a "exec_result" message containing the "exec-id"
- and the error code.
-+
-On Unix-based systems, `exec()` does not return if successful.
-This message is used to indicate that the `exec()` failed and
-that the current program is continuing.
+e.g: `void trace2_child_start(struct child_process *cmd)`.
=== Git Thread Messages
These messages are concerned with Git thread usage.
-`void trace2_thread_start(const char *thread_name)`::
-
- Emits a "thread_start" message.
-+
-The `thread_name` field should be a descriptive name, such as the
-unique name of the thread-proc. A unique "thread-id" will be added
-to the name to uniquely identify thread instances.
-+
-Region and data messages (described later) may refer to this thread
-name.
-+
-This function must be called by the thread-proc of the new thread
-(so that TLS data is properly initialized) and not by the caller
-of `pthread_create()`.
-
-`void trace2_thread_exit()`::
-
- Emits a "thread_exit" message containing the thread name
- and the thread elapsed time.
-+
-This function must be called by the thread-proc before it returns
-(so that the coorect TLS data is used and cleaned up. It should
-not be called by the caller of `pthread_join()`.
+e.g: `void trace2_thread_start(const char *thread_name)`.
=== Region and Data Messages
These are concerned with recording performance data
-over regions or spans of code.
-
-`void trace2_region_enter(const char *category, const char *label, const struct repository *repo)`::
-
-`void trace2_region_enter_printf(const char *category, const char *label, const struct repository *repo, const char *fmt, ...)`::
-
-`void trace2_region_enter_printf_va(const char *category, const char *label, const struct repository *repo, const char *fmt, va_list ap)`::
-
- Emits a thread-relative "region_enter" message with optional
- printf string.
-+
-This function pushes a new region nesting stack level on the current
-thread and starts a clock for the new stack frame.
-+
-The `category` field is an arbitrary category name used to classify
-regions by feature area, such as "status" or "index". At this time
-it is only just printed along with the rest of the message. It may
-be used in the future to filter messages.
-+
-The `label` field is an arbitrary label used to describe the activity
-being started, such as "read_recursive" or "do_read_index".
-+
-The `repo` field, if set, will be used to get the "repo-id", so that
-recursive oerations can be attributed to the correct repository.
-
-`void trace2_region_leave(const char *category, const char *label, const struct repository *repo)`::
-
-`void trace2_region_leave_printf(const char *category, const char *label, const struct repository *repo, const char *fmt, ...)`::
-
-`void trace2_region_leave_printf_va(const char *category, const char *label, const struct repository *repo, const char *fmt, va_list ap)`::
-
- Emits a thread-relative "region_leave" message with optional
- printf string.
-+
-This function pops the region nesting stack on the current thread
-and reports the elapsed time of the stack frame.
-+
-The `category`, `label`, and `repo` fields are the same as above.
-The `category` and `label` do not need to match the correpsonding
-"region_enter" message, but it makes the data stream easier to
-understand.
-
-`void trace2_data_string(const char *category, const struct repository *repo, const char *key, const char * value)`::
-
-`void trace2_data_intmax(const char *category, const struct repository *repo, const char *key, intmax value)`::
-
-`void trace2_data_json(const char *category, const struct repository *repo, const char *key, const struct json_writer *jw)`::
+over regions or spans of code. e.g:
+`void trace2_region_enter(const char *category, const char *label, const struct repository *repo)`.
- Emits a region- and thread-relative "data" or "data_json" message.
-+
-This is a key/value pair message containing information about the
-current thread, region stack, and repository. This could be used
-to print the number of files in a directory during a multi-threaded
-recursive tree walk.
-
-`void trace2_printf(const char *fmt, ...)`::
-
-`void trace2_printf_va(const char *fmt, va_list ap)`::
-
- Emits a region- and thread-relative "printf" message.
+Refer to trace2.h for details about all trace2 functions.
== Trace2 Target Formats
@@ -605,17 +379,35 @@ only present on the "start" and "atexit" events.
==== Event-Specific Key/Value Pairs
`"version"`::
- This event gives the version of the executable and the EVENT format.
+ This event gives the version of the executable and the EVENT format. It
+ should always be the first event in a trace session. The EVENT format
+ version will be incremented if new event types are added, if existing
+ fields are removed, or if there are significant changes in
+ interpretation of existing events or fields. Smaller changes, such as
+ adding a new field to an existing event, will not require an increment
+ to the EVENT format version.
+
------------
{
"event":"version",
...
- "evt":"1", # EVENT format version
+ "evt":"2", # EVENT format version
"exe":"2.20.1.155.g426c96fcdb" # git version
}
------------
+`"discard"`::
+ This event is written to the git-trace2-discard sentinel file if there
+ are too many files in the target trace directory (see the
+ trace2.maxFiles config option).
++
+------------
+{
+ "event":"discard",
+ ...
+}
+------------
+
`"start"`::
This event contains the complete argv received by main().
+
@@ -799,7 +591,7 @@ with "?".
Note that the session-id of the child process is not available to
the current/spawning process, so the child's PID is reported here as
a hint for post-processing. (But it is only a hint because the child
-proces may be a shell script which doesn't have a session-id.)
+process may be a shell script which doesn't have a session-id.)
+
Note that the `t_rel` field contains the observed run time in seconds
for the child process (starting before the fork/exec/spawn and
@@ -1159,7 +951,7 @@ d0 | main | atexit | | 0.028809 | |
+
Regions may be nested. This causes messages to be indented in the
PERF target, for example.
-Elapsed times are relative to the start of the correpsonding nesting
+Elapsed times are relative to the start of the corresponding nesting
level as expected. For example, if we add region message to:
+
----------------
@@ -1354,7 +1146,7 @@ d0 | main | atexit | | 0.030027 | |
In this example, the preload region took 0.009122 seconds. The 7 threads
took between 0.006069 and 0.008947 seconds to work on their portion of
the index. Thread "th01" worked on 508 items at offset 0. Thread "th02"
-worked on 508 items at offset 2032. Thread "th04" worked on 508 itemts
+worked on 508 items at offset 2032. Thread "th04" worked on 508 items
at offset 508.
+
This example also shows that thread names are assigned in a racy manner