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perf trace: Introduce syscall arg formatters

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Starting with one for printing pointers in hexadecimal, using the
information in the syscall tracepoint format.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-c4y4jy7qqkn8wsd8q6j1g7zh@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2013-08-23 18:14:48 -03:00
parent adaa18bf5d
commit 13d4ff3eb3
1 changed files with 36 additions and 3 deletions
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39
tools/perf/builtin-trace.c
View File

@ -12,6 +12,11 @@
#include <libaudit.h>
#include <stdlib.h>
static size_t syscall_arg__scnprintf_hex(char *bf, size_t size, unsigned long arg)
{
return scnprintf(bf, size, "%#lx", arg);
}
static struct syscall_fmt {
const char *name;
const char *alias;
@ -51,6 +56,7 @@ struct syscall {
const char *name;
bool filtered;
struct syscall_fmt *fmt;
size_t (**arg_scnprintf)(char *bf, size_t size, unsigned long arg);
};
static size_t fprintf_duration(unsigned long t, FILE *fp)
@ -207,6 +213,24 @@ static int trace__symbols_init(struct trace *trace, struct perf_evlist *evlist)
return err;
}
static int syscall__set_arg_fmts(struct syscall *sc)
{
struct format_field *field;
int idx = 0;
sc->arg_scnprintf = calloc(sc->tp_format->format.nr_fields - 1, sizeof(void *));
if (sc->arg_scnprintf == NULL)
return -1;
for (field = sc->tp_format->format.fields->next; field; field = field->next) {
if (field->flags & FIELD_IS_POINTER)
sc->arg_scnprintf[idx] = syscall_arg__scnprintf_hex;
++idx;
}
return 0;
}
static int trace__read_syscall_info(struct trace *trace, int id)
{
char tp_name[128];
@ -259,7 +283,10 @@ static int trace__read_syscall_info(struct trace *trace, int id)
sc->tp_format = event_format__new("syscalls", tp_name);
}
return sc->tp_format != NULL ? 0 : -1;
if (sc->tp_format == NULL)
return -1;
return syscall__set_arg_fmts(sc);
}
static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
@ -273,8 +300,14 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
for (field = sc->tp_format->format.fields->next; field; field = field->next) {
printed += scnprintf(bf + printed, size - printed,
"%s%s: %ld", printed ? ", " : "",
field->name, args[i++]);
"%s%s: ", printed ? ", " : "", field->name);
if (sc->arg_scnprintf && sc->arg_scnprintf[i])
printed += sc->arg_scnprintf[i](bf + printed, size - printed, args[i]);
else
printed += scnprintf(bf + printed, size - printed,
"%ld", args[i]);
++i;
}
} else {
while (i < 6) {