[PATCH 32/57] perf trace: Introduce 'struct evsel__trace' for evsel->priv needs

Arnaldo Carvalho de Melo
2019-10-21T13:40:28Z

From: Arnaldo Carvalho de Melo <acme@redhat.com>

For syscalls we need to cache the 'syscall_id' and 'ret' field offsets
but as well have a pointer to the syscall_fmt_arg array for the fields,
so that we can expand strings in filter expressions, so introduce
a 'struct evsel_trace' to have in evsel->priv that allows for that.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Luis Cláudio Gonçalves <lclaudio@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-hx8ukasuws5sz6rsar73cocv@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-trace.c | 54 +++++++++++++++++++++++++++++++++-----
1 file changed, 48 insertions(+), 6 deletions(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 1d2ed2823202..5792278065f6 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -285,21 +285,47 @@ struct syscall_tp {
};
};

+/*
+ * The evsel->priv as used by 'perf trace'
+ * sc: for raw_syscalls:sys_{enter,exit} and syscalls:sys_{enter,exit}_SYSCALLNAME
+ * fmt: for all the other tracepoints
+ */
+struct evsel_trace {
+ struct syscall_tp sc;
+ struct syscall_arg_fmt *fmt;
+};
+
+static struct evsel_trace *evsel_trace__new(void)
+{
+ return zalloc(sizeof(struct evsel_trace));
+}
+
+static void evsel_trace__delete(struct evsel_trace *et)
+{
+ if (et == NULL)
+ return;
+
+ zfree(&et->fmt);
+ free(et);
+}
+
/*
* Used with raw_syscalls:sys_{enter,exit} and with the
* syscalls:sys_{enter,exit}_SYSCALL tracepoints
*/
static inline struct syscall_tp *__evsel__syscall_tp(struct evsel *evsel)
{
- struct syscall_tp *sc = evsel->priv;
+ struct evsel_trace *et = evsel->priv;

- return sc;
+ return &et->sc;
}

static struct syscall_tp *evsel__syscall_tp(struct evsel *evsel)
{
if (evsel->priv == NULL) {
- evsel->priv = zalloc(sizeof(struct syscall_tp));
+ evsel->priv = evsel_trace__new();
+ if (evsel->priv == NULL)
+ return NULL;
}

return __evsel__syscall_tp(evsel);
@@ -310,18 +336,34 @@ static struct syscall_tp *evsel__syscall_tp(struct evsel *evsel)
*/
static inline struct syscall_arg_fmt *__evsel__syscall_arg_fmt(struct evsel *evsel)
{
- struct syscall_arg_fmt *fmt = evsel->priv;
+ struct evsel_trace *et = evsel->priv;

- return fmt;
+ return et->fmt;
}

static struct syscall_arg_fmt *evsel__syscall_arg_fmt(struct evsel *evsel)
{
+ struct evsel_trace *et = evsel->priv;
+
if (evsel->priv == NULL) {
- evsel->priv = calloc(evsel->tp_format->format.nr_fields, sizeof(struct syscall_arg_fmt));
+ et = evsel->priv = evsel_trace__new();
+
+ if (et == NULL)
+ return NULL;
+ }
+
+ if (et->fmt == NULL) {
+ et->fmt = calloc(evsel->tp_format->format.nr_fields, sizeof(struct syscall_arg_fmt));
+ if (et->fmt == NULL)
+ goto out_delete;
}

return __evsel__syscall_arg_fmt(evsel);
+
+out_delete:
+ evsel_trace__delete(evsel->priv);
+ evsel->priv = NULL;
+ return NULL;
}

static int perf_evsel__init_tp_uint_field(struct evsel *evsel,
--
2.21.0