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tools lib traceevent: Introduce new libtracevent API: tep_override_comm() 

This patch adds a new API of tracevent library: tep_override_comm() It
registers a pid / command mapping. If a mapping with the same pid
already exists, the entry is updated with the new command.

Signed-off-by: Tzvetomir Stoyanov <tstoyanov@vmware.com>
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/20181130154648.038915912@goodmis.org
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tzvetomir Stoyanov 2018-11-30 10:44:11 -05:00 committed by Arnaldo Carvalho de Melo
parent 21327c7843
commit ca3958b1c0
2 changed files with 55 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
tools/lib/traceevent/event-parse.c
View File

@ -232,11 +232,13 @@ int tep_pid_is_registered(struct tep_handle *pevent, int pid)
* we must add this pid. This is much slower than when cmdlines
* are added before the array is initialized.
*/
static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
static int add_new_comm(struct tep_handle *pevent,
const char *comm, int pid, bool override)
{
struct cmdline *cmdlines = pevent->cmdlines;
const struct cmdline *cmdline;
struct cmdline *cmdline;
struct cmdline key;
char *new_comm;
if (!pid)
return 0;
@ -247,8 +249,19 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
cmdline = bsearch(&key, pevent->cmdlines, pevent->cmdline_count,
sizeof(*pevent->cmdlines), cmdline_cmp);
if (cmdline) {
errno = EEXIST;
return -1;
if (!override) {
errno = EEXIST;
return -1;
}
new_comm = strdup(comm);
if (!new_comm) {
errno = ENOMEM;
return -1;
}
free(cmdline->comm);
cmdline->comm = new_comm;
return 0;
}
cmdlines = realloc(cmdlines, sizeof(*cmdlines) * (pevent->cmdline_count + 1));
@ -275,21 +288,13 @@ static int add_new_comm(struct tep_handle *pevent, const char *comm, int pid)
return 0;
}
/**
* tep_register_comm - register a pid / comm mapping
* @pevent: handle for the pevent
* @comm: the command line to register
* @pid: the pid to map the command line to
*
* This adds a mapping to search for command line names with
* a given pid. The comm is duplicated.
*/
int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid)
static int _tep_register_comm(struct tep_handle *pevent,
const char *comm, int pid, bool override)
{
struct cmdline_list *item;
if (pevent->cmdlines)
return add_new_comm(pevent, comm, pid);
return add_new_comm(pevent, comm, pid, override);
item = malloc(sizeof(*item));
if (!item)
@ -312,6 +317,40 @@ int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid)
return 0;
}
/**
* tep_register_comm - register a pid / comm mapping
* @pevent: handle for the pevent
* @comm: the command line to register
* @pid: the pid to map the command line to
*
* This adds a mapping to search for command line names with
* a given pid. The comm is duplicated. If a command with the same pid
* already exist, -1 is returned and errno is set to EEXIST
*/
int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid)
{
return _tep_register_comm(pevent, comm, pid, false);
}
/**
* tep_override_comm - register a pid / comm mapping
* @pevent: handle for the pevent
* @comm: the command line to register
* @pid: the pid to map the command line to
*
* This adds a mapping to search for command line names with
* a given pid. The comm is duplicated. If a command with the same pid
* already exist, the command string is udapted with the new one
*/
int tep_override_comm(struct tep_handle *pevent, const char *comm, int pid)
{
if (!pevent->cmdlines && cmdline_init(pevent)) {
errno = ENOMEM;
return -1;
}
return _tep_register_comm(pevent, comm, pid, true);
}
int tep_register_trace_clock(struct tep_handle *pevent, const char *trace_clock)
{
pevent->trace_clock = strdup(trace_clock);

1
tools/lib/traceevent/event-parse.h
View File

@ -432,6 +432,7 @@ int tep_set_function_resolver(struct tep_handle *pevent,
tep_func_resolver_t *func, void *priv);
void tep_reset_function_resolver(struct tep_handle *pevent);
int tep_register_comm(struct tep_handle *pevent, const char *comm, int pid);
int tep_override_comm(struct tep_handle *pevent, const char *comm, int pid);
int tep_register_trace_clock(struct tep_handle *pevent, const char *trace_clock);
int tep_register_function(struct tep_handle *pevent, char *name,
unsigned long long addr, char *mod);