[verse]
#define *TRACEPOINT_ENUM*('prov_name', 'enum_name', 'mappings')
#define *TRACEPOINT_EVENT*('prov_name', 't_name', 'args', 'fields')
-#define *TRACEPOINT_EVENT_CLASS*('prov_name', 'class_name',
- 'args', 'fields')
-#define *TRACEPOINT_EVENT_INSTANCE*('prov_name', 'class_name',
- 't_name', 'args')
+#define *TRACEPOINT_EVENT_CLASS*('prov_name', 'class_name', 'args', 'fields')
+#define *TRACEPOINT_EVENT_INSTANCE*('prov_name', 'class_name', 't_name', 'args')
#define *TRACEPOINT_LOGLEVEL*('prov_name', 't_name', 'level')
#define *ctf_array*('int_type', 'field_name', 'expr', 'count')
#define *ctf_array_nowrite*('int_type', 'field_name', 'expr', 'count')
#define *ctf_array_text*(char, 'field_name', 'expr', 'count')
#define *ctf_array_text_nowrite*(char, 'field_name', 'expr', 'count')
#define *ctf_enum*('prov_name', 'enum_name', 'int_type', 'field_name', 'expr')
-#define *ctf_enum_nowrite*('prov_name', 'enum_name', 'int_type',
- 'field_name', 'expr')
+#define *ctf_enum_nowrite*('prov_name', 'enum_name', 'int_type', 'field_name',
+ 'expr')
#define *ctf_enum_value*('label', 'value')
#define *ctf_enum_range*('label', 'start', 'end')
#define *ctf_float*('float_type', 'field_name', 'expr')
#define *ctf_sequence_network_nowrite_hex*('int_type', 'field_name', 'expr',
'len_type', 'len_expr')
#define *ctf_sequence_text*(char, 'field_name', 'expr', 'len_type', 'len_expr')
-#define *ctf_sequence_text_nowrite*(char, 'field_name', 'expr',
- 'len_type', 'len_expr')
+#define *ctf_sequence_text_nowrite*(char, 'field_name', 'expr', 'len_type',
+ 'len_expr')
#define *ctf_string*('field_name', 'expr')
#define *ctf_string_nowrite*('field_name', 'expr')
#define *do_tracepoint*('prov_name', 't_name', ...)
'len_expr')
*ctf_sequence_network_hex*('int_type', 'field_name', 'expr', 'len_type',
'len_expr')
-*ctf_sequence_network_nowrite_hex*('int_type', 'field_name', 'expr', 'len_type',
- 'len_expr')
+*ctf_sequence_network_nowrite_hex*('int_type', 'field_name', 'expr',
+ 'len_type', 'len_expr')
Dynamically-sized array, displayed as text; no need to be null-terminated:
The parameters are:
-'int_type'::
- Integer C type. The size of this type determines the size of the
- integer/enumeration field.
-
-'float_type'::
- Float C type (`float` or `double`). The size of this type determines
- the size of the floating point number field.
+'count'::
+ Number of elements in array/sequence. This must be known at
+ compile time.
-'field_name'::
- Event field name (C identifier syntax, :not: a literal string).
+'enum_name'::
+ Name of an enumeration field previously defined with the
+ `TRACEPOINT_ENUM()` macro. See the
+ <<tracepoint-enum,`TRACEPOINT_ENUM()` usage>> section for more
+ information.
'expr'::
C expression resulting in the field's value. This expression can
of a given tracepoint are defined in the `TP_ARGS()` macro (see
the <<creating-tp,Creating a tracepoint provider>> section above).
-'count'::
- Number of elements in array/sequence. This must be known at
- compile time.
+'field_name'::
+ Event field name (C identifier syntax, :not: a literal string).
-'len_type'::
- Unsigned integer C type of sequence's length.
+'float_type'::
+ Float C type (`float` or `double`). The size of this type determines
+ the size of the floating point number field.
+
+'int_type'::
+ Integer C type. The size of this type determines the size of the
+ integer/enumeration field.
'len_expr'::
C expression resulting in the sequence's length. This expression
can use one or more arguments passed to the tracepoint.
+'len_type'::
+ Unsigned integer C type of sequence's length.
+
'prov_name'::
Tracepoint provider name. This must be the same as the tracepoint
provider name used in a previous field definition.
-'enum_name'::
- Name of an enumeration field previously defined with the
- `TRACEPOINT_ENUM()` macro. See the
- <<tracepoint-enum,`TRACEPOINT_ENUM()` usage>> section for more
- information.
-
The `_nowrite` versions omit themselves from the recorded trace, but are
otherwise identical. Their primary purpose is to make some of the
event context available to the event filters without having to commit
application with the `LD_PRELOAD` environment variable (see
man:ld.so(8)).
+To use `liblttng-ust` with a daemon application which closes file
+descriptors that were not opened by it, preload the `liblttng-ust-fd.so`
+library before you start the application. Typical use cases include
+daemons closing all file descriptors after man:fork(2), and buggy
+applications doing ``double-closes''.
+
Context information
~~~~~~~~~~~~~~~~~~~
reverse-lookup the source location that caused the event
to be emitted.
-+perf:thread:COUNTER+::
+`perf:thread:COUNTER`::
perf counter named 'COUNTER'. Use `lttng add-context --list` to
list the available perf counters.
+
Only available on IA-32 and x86-64 architectures.
+`perf:thread:raw:rN:NAME`::
+ perf counter with raw ID 'N' and custom name 'NAME'. See
+ man:lttng-add-context(1) for more details.
+
`pthread_id`::
POSIX thread identifier. Can be used on architectures where
`pthread_t` maps nicely to an `unsigned long` type.
by the tracer.
The following LTTng-UST state dump events exist and must be enabled
-to record application state dumps.
+to record application state dumps. Note that, during the state dump
+phase, LTTng-UST can also emit _shared library load/unload_ events
+(see <<ust-lib,Shared library load/unload tracking>> below).
`lttng_ust_statedump:start`::
Emitted when the state dump begins.
Fields:
+
[options="header"]
-|==================================================================
-| Field name | Description
-| `baddr` | Base address of loaded executable
-| `memsz` | Size of loaded executable in memory
-| `path` | Path to loaded executable file
-| `is_pic` | Whether the executable is
- position-independent code
-|==================================================================
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of loaded executable.
+
+|`memsz`
+|Size of loaded executable in memory.
+
+|`path`
+|Path to loaded executable file.
+
+|`is_pic`
+|Whether or not the executable is position-independent code.
+
+|`has_build_id`
+|Whether or not the executable has a build ID. If this field is 1, you
+can expect that an `lttng_ust_statedump:build_id` event record follows
+this one (not necessarily immediately after).
+
+|`has_debug_link`
+|Whether or not the executable has debug link information. If this field
+is 1, you can expect that an `lttng_ust_statedump:debug_link` event
+record follows this one (not necessarily immediately after).
+|===
`lttng_ust_statedump:build_id`::
Emitted when a build ID is found in a currently loaded shared
Fields:
+
[options="header"]
-|==============================================================
-| Field name | Description
-| `baddr` | Base address of loaded library
-| `build_id` | Build ID
-|==============================================================
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of loaded library.
+
+|`build_id`
+|Build ID.
+|===
`lttng_ust_statedump:debug_link`::
Emitted when debug link information is found in a currently loaded
Fields:
+
[options="header"]
-|==============================================================
-| Field name | Description
-| `baddr` | Base address of loaded library
-| `crc` | Debug link file's CRC
-| `filename` | Debug link file name
-|==============================================================
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of loaded library.
+
+|`crc`
+|Debug link file's CRC.
+
+|`filename`
+|Debug link file name.
+|===
+
+
+[[ust-lib]]
+Shared library load/unload tracking
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The <<state-dump,LTTng-UST state dump>> and the LTTng-UST helper library
+to instrument the dynamic linker (see man:liblttng-ust-dl(3)) can emit
+**shared library load/unload tracking** events.
+
+The following shared library load/unload tracking events exist and must
+be enabled to track the loading and unloading of shared libraries:
+
+`lttng_ust_lib:load`::
+ Emitted when a shared library (shared object) is loaded.
++
+Fields:
++
+[options="header"]
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of loaded library.
+
+|`memsz`
+|Size of loaded library in memory.
+
+|`path`
+|Path to loaded library file.
+
+|`has_build_id`
+|Whether or not the library has a build ID. If this field is 1, you
+can expect that an `lttng_ust_lib:build_id` event record follows
+this one (not necessarily immediately after).
+
+|`has_debug_link`
+|Whether or not the library has debug link information. If this field
+is 1, you can expect that an `lttng_ust_lib:debug_link` event
+record follows this one (not necessarily immediately after).
+|===
+
+`lttng_ust_lib:unload`::
+ Emitted when a shared library (shared object) is unloaded.
++
+Fields:
++
+[options="header"]
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of unloaded library.
+|===
+
+`lttng_ust_lib:build_id`::
+ Emitted when a build ID is found in a loaded shared library (shared
+ object). See
+ https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html[Debugging Information in Separate Files]
+ for more information about build IDs.
++
+Fields:
++
+[options="header"]
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of loaded library.
+
+|`build_id`
+|Build ID.
+|===
+
+`lttng_ust_lib:debug_link`::
+ Emitted when debug link information is found in a loaded
+ shared library (shared object). See
+ https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html[Debugging Information in Separate Files]
+ for more information about debug links.
++
+Fields:
++
+[options="header"]
+|===
+|Field name |Description
+
+|`baddr`
+|Base address of loaded library.
+
+|`crc`
+|Debug link file's CRC.
+
+|`filename`
+|Debug link file name.
+|===
[[example]]
projects / lttng-ust.git / blobdiff