diff options
| author | Tom Zanussi <zanussi@kernel.org> | 2020-01-29 12:59:24 -0600 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2020-01-30 09:46:28 -0500 |
| commit | 86c5426baddae9ff192e3159b9c2e7c14e3964c6 (patch) | |
| tree | 8b88a510fc8b50de5323b4e5644e56ec2315cd7b /include/linux/trace_events.h | |
| parent | f5f6b255a253e2c3132ca283e9090a6343bfb719 (diff) | |
tracing: Add dynamic event command creation interface
Add an interface used to build up dynamic event creation commands,
such as synthetic and kprobe events. Interfaces specific to those
particular types of events and others can be built on top of this
interface.
Command creation is started by first using the dynevent_cmd_init()
function to initialize the dynevent_cmd object. Following that, args
are appended and optionally checked by the dynevent_arg_add() and
dynevent_arg_pair_add() functions, which use objects representing
arguments and pairs of arguments, initialized respectively by
dynevent_arg_init() and dynevent_arg_pair_init(). Finally, once all
args have been successfully added, the command is finalized and
actually created using dynevent_create().
The code here for actually printing into the dyn_event->cmd buffer
using snprintf() etc was adapted from v4 of Masami's 'tracing/boot:
Add synthetic event support' patch.
Link: http://lkml.kernel.org/r/1f65fa44390b6f238f6036777c3784ced1dcc6a0.1580323897.git.zanussi@kernel.org
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_events.h')
| -rw-r--r-- | include/linux/trace_events.h | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index 25fe743bcbaf..651b03d5e272 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -354,6 +354,29 @@ extern struct trace_event_file *trace_get_event_file(const char *instance, const char *event); extern void trace_put_event_file(struct trace_event_file *file); +#define MAX_DYNEVENT_CMD_LEN (2048) + +enum dynevent_type { + DYNEVENT_TYPE_NONE, +}; + +struct dynevent_cmd; + +typedef int (*dynevent_create_fn_t)(struct dynevent_cmd *cmd); + +struct dynevent_cmd { + char *buf; + const char *event_name; + int maxlen; + int remaining; + unsigned int n_fields; + enum dynevent_type type; + dynevent_create_fn_t run_command; + void *private_data; +}; + +extern int dynevent_create(struct dynevent_cmd *cmd); + extern int synth_event_delete(const char *name); /* |