[tip:perf/core] perf trace: Allow syscall arg formatters to mask args

tip-bot for Arnaldo Carvalho de Melo
2013-09-03T07:15:44Z

Commit-ID: 6e7eeb51106d2e9ef7975214747e76d23c5d01af
Gitweb: http://git.kernel.org/tip/6e7eeb51106d2e9ef7975214747e76d23c5d01af
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
AuthorDate: Mon, 2 Sep 2013 10:39:21 -0300
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 2 Sep 2013 14:58:18 -0300

perf trace: Allow syscall arg formatters to mask args

The futex syscall ignores some arguments according to the 'operation'
arg, so allow arg formatters to mask those.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.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-abqrg3oldgfsdnltfrvso9f7@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-trace.c | 33 ++++++++++++++++++++++-----------
1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 69a065e..c29692a 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -15,14 +15,16 @@
#include <stdlib.h>
#include <sys/mman.h>

-static size_t syscall_arg__scnprintf_hex(char *bf, size_t size, unsigned long arg)
+static size_t syscall_arg__scnprintf_hex(char *bf, size_t size,
+ unsigned long arg, u8 *arg_mask __maybe_unused)
{
return scnprintf(bf, size, "%#lx", arg);
}

#define SCA_HEX syscall_arg__scnprintf_hex

-static size_t syscall_arg__scnprintf_mmap_prot(char *bf, size_t size, unsigned long arg)
+static size_t syscall_arg__scnprintf_mmap_prot(char *bf, size_t size,
+ unsigned long arg, u8 *arg_mask __maybe_unused)
{
int printed = 0, prot = arg;

@@ -52,7 +54,8 @@ static size_t syscall_arg__scnprintf_mmap_prot(char *bf, size_t size, unsigned l

#define SCA_MMAP_PROT syscall_arg__scnprintf_mmap_prot

-static size_t syscall_arg__scnprintf_mmap_flags(char *bf, size_t size, unsigned long arg)
+static size_t syscall_arg__scnprintf_mmap_flags(char *bf, size_t size,
+ unsigned long arg, u8 *arg_mask __maybe_unused)
{
int printed = 0, flags = arg;

@@ -92,7 +95,8 @@ static size_t syscall_arg__scnprintf_mmap_flags(char *bf, size_t size, unsigned

#define SCA_MMAP_FLAGS syscall_arg__scnprintf_mmap_flags

-static size_t syscall_arg__scnprintf_madvise_behavior(char *bf, size_t size, unsigned long arg)
+static size_t syscall_arg__scnprintf_madvise_behavior(char *bf, size_t size,
+ unsigned long arg, u8 *arg_mask __maybe_unused)
{
int behavior = arg;

@@ -136,7 +140,7 @@ static size_t syscall_arg__scnprintf_madvise_behavior(char *bf, size_t size, uns
static struct syscall_fmt {
const char *name;
const char *alias;
- size_t (*arg_scnprintf[6])(char *bf, size_t size, unsigned long arg);
+ size_t (*arg_scnprintf[6])(char *bf, size_t size, unsigned long arg, u8 *arg_mask);
bool errmsg;
bool timeout;
bool hexret;
@@ -198,7 +202,8 @@ struct syscall {
const char *name;
bool filtered;
struct syscall_fmt *fmt;
- size_t (**arg_scnprintf)(char *bf, size_t size, unsigned long arg);
+ size_t (**arg_scnprintf)(char *bf, size_t size,
+ unsigned long arg, u8 *args_mask);
};

static size_t fprintf_duration(unsigned long t, FILE *fp)
@@ -443,17 +448,23 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,

if (sc->tp_format != NULL) {
struct format_field *field;
+ u8 mask = 0, bit = 1;
+
+ for (field = sc->tp_format->format.fields->next; field;
+ field = field->next, ++i, bit <<= 1) {
+ if (mask & bit)
+ continue;

- for (field = sc->tp_format->format.fields->next; field; field = field->next) {
printed += scnprintf(bf + printed, size - printed,
"%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
+ if (sc->arg_scnprintf && sc->arg_scnprintf[i]) {
+ printed += sc->arg_scnprintf[i](bf + printed, size - printed,
+ args[i], &mask);
+ } else {
printed += scnprintf(bf + printed, size - printed,
"%ld", args[i]);
- ++i;
+ }
}
} else {
while (i < 6) {