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tools lib traceevent: Add pevent_data_pid_from_comm()

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There is a pevent_data_comm_from_pid() that returns the cmdline stored for
a given pid in order for users to map pids to comms, but there's no method
to convert a comm back to a pid. This is useful for filters that specify
a comm instead of a PID (it's faster than searching each individual event).

Add a way to retrieve a comm from a pid. Since there can be more than one
pid associated to a comm, it returns a data structure that lets the user
iterate over all the saved comms for a given pid.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/20150324135923.001103479@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Steven Rostedt (Red Hat)
2015-03-24 09:57:52 -04:00
committed by Arnaldo Carvalho de Melo
parent 5542629696
commit 2771984c7f
2 changed files with 95 additions and 0 deletions
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5
tools/lib/traceevent/event-parse.h
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@@ -678,6 +678,11 @@ int pevent_data_type(struct pevent *pevent, struct pevent_record *rec);
struct event_format *pevent_data_event_from_type(struct pevent *pevent, int type);
int pevent_data_pid(struct pevent *pevent, struct pevent_record *rec);
const char *pevent_data_comm_from_pid(struct pevent *pevent, int pid);
struct cmdline;
struct cmdline *pevent_data_pid_from_comm(struct pevent *pevent, const char *comm,
struct cmdline *next);
int pevent_cmdline_pid(struct pevent *pevent, struct cmdline *cmdline);
void pevent_event_info(struct trace_seq *s, struct event_format *event,
struct pevent_record *record);
int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum,