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perf trace: Allow specifying number of syscall args for tracepointless syscalls

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When we don't have syscalls:sys_{enter,exit}_NAME, we had to resort to
dumping all the 6 syscall arguments, fix it by providing that info for
such syscalls, like 'clone'.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-dfq1jtrxj8dqvqoeqqpr3slu@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-07-19 15:08:14 -03:00
parent 325f5091b0
commit 332337dafc
1 changed files with 5 additions and 1 deletions
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6
tools/perf/builtin-trace.c
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@ -611,6 +611,7 @@ static struct syscall_fmt {
const char *name;
const char *alias;
struct syscall_arg_fmt arg[6];
u8 nr_args;
bool errpid;
bool timeout;
bool hexret;
@ -1169,6 +1170,9 @@ static int syscall__alloc_arg_fmts(struct syscall *sc, int nr_args)
{
int idx;
if (nr_args == 6 && sc->fmt && sc->fmt->nr_args != 0)
nr_args = sc->fmt->nr_args;
sc->arg_fmt = calloc(nr_args, sizeof(*sc->arg_fmt));
if (sc->arg_fmt == NULL)
return -1;
@ -1413,7 +1417,7 @@ static size_t syscall__scnprintf_args(struct syscall *sc, char *bf, size_t size,
* may end up not having any args, like with gettid(), so only
* print the raw args when we didn't manage to read it.
*/
while (arg.idx < 6) {
while (arg.idx < sc->nr_args) {
if (arg.mask & bit)
goto next_arg;
val = syscall_arg__val(&arg, arg.idx);