From 8b913df50f56a26b9e336becdd0af9d5ce3831cd Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Thu, 17 Oct 2019 10:39:46 -0300 Subject: [PATCH] perf trace: Hide evsel->access further, simplify code MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Next step will be to have a 'struct evsel_trace' to allow for handling the syscalls tracepoints via the strace-like code while reusing parts of that code with the other tracepoints, where we don't have things like the 'syscall_nr' or 'ret' ((raw_)?syscalls:sys_{enter,exit}(_SYSCALL)?) args that we want to cache offsets and have been using evsel->priv for that, while for the other tracepoints we'll have just an array of 'struct syscall_arg_fmt' (i.e. ->scnprint() for number->string and ->strtoul() string->number conversions and other state those functions need). Cc: Adrian Hunter Cc: David Ahern Cc: Jiri Olsa Cc: Luis Cláudio Gonçalves Cc: Namhyung Kim Link: https://lkml.kernel.org/n/tip-fre21jbyoqxmmquxcho7oa0x@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-trace.c | 57 +++++++++++++++++++++----------------- 1 file changed, 31 insertions(+), 26 deletions(-) diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index e0be1df555a2..1d2ed2823202 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -296,6 +296,15 @@ static inline struct syscall_tp *__evsel__syscall_tp(struct evsel *evsel) return sc; } +static struct syscall_tp *evsel__syscall_tp(struct evsel *evsel) +{ + if (evsel->priv == NULL) { + evsel->priv = zalloc(sizeof(struct syscall_tp)); + } + + return __evsel__syscall_tp(evsel); +} + /* * Used with all the other tracepoints. */ @@ -306,6 +315,15 @@ static inline struct syscall_arg_fmt *__evsel__syscall_arg_fmt(struct evsel *evs return fmt; } +static struct syscall_arg_fmt *evsel__syscall_arg_fmt(struct evsel *evsel) +{ + if (evsel->priv == NULL) { + evsel->priv = calloc(evsel->tp_format->format.nr_fields, sizeof(struct syscall_arg_fmt)); + } + + return __evsel__syscall_arg_fmt(evsel); +} + static int perf_evsel__init_tp_uint_field(struct evsel *evsel, struct tp_field *field, const char *name) @@ -346,41 +364,34 @@ static void evsel__delete_priv(struct evsel *evsel) static int perf_evsel__init_syscall_tp(struct evsel *evsel) { - struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp)); + struct syscall_tp *sc = evsel__syscall_tp(evsel); - if (evsel->priv != NULL) { + if (sc != NULL) { if (perf_evsel__init_tp_uint_field(evsel, &sc->id, "__syscall_nr") && perf_evsel__init_tp_uint_field(evsel, &sc->id, "nr")) - goto out_delete; + return -ENOENT; return 0; } return -ENOMEM; -out_delete: - zfree(&evsel->priv); - return -ENOENT; } static int perf_evsel__init_augmented_syscall_tp(struct evsel *evsel, struct evsel *tp) { - struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp)); + struct syscall_tp *sc = evsel__syscall_tp(evsel); - if (evsel->priv != NULL) { + if (sc != NULL) { struct tep_format_field *syscall_id = perf_evsel__field(tp, "id"); if (syscall_id == NULL) syscall_id = perf_evsel__field(tp, "__syscall_nr"); - if (syscall_id == NULL) - goto out_delete; - if (__tp_field__init_uint(&sc->id, syscall_id->size, syscall_id->offset, evsel->needs_swap)) - goto out_delete; + if (syscall_id == NULL || + __tp_field__init_uint(&sc->id, syscall_id->size, syscall_id->offset, evsel->needs_swap)) + return -EINVAL; return 0; } return -ENOMEM; -out_delete: - zfree(&evsel->priv); - return -EINVAL; } static int perf_evsel__init_augmented_syscall_tp_args(struct evsel *evsel) @@ -399,20 +410,15 @@ static int perf_evsel__init_augmented_syscall_tp_ret(struct evsel *evsel) static int perf_evsel__init_raw_syscall_tp(struct evsel *evsel, void *handler) { - evsel->priv = malloc(sizeof(struct syscall_tp)); - if (evsel->priv != NULL) { + if (evsel__syscall_tp(evsel) != NULL) { if (perf_evsel__init_sc_tp_uint_field(evsel, id)) - goto out_delete; + return -ENOENT; evsel->handler = handler; return 0; } return -ENOMEM; - -out_delete: - zfree(&evsel->priv); - return -ENOENT; } static struct evsel *perf_evsel__raw_syscall_newtp(const char *direction, void *handler) @@ -1690,11 +1696,10 @@ static int trace__read_syscall_info(struct trace *trace, int id) static int perf_evsel__init_tp_arg_scnprintf(struct evsel *evsel) { - int nr_args = evsel->tp_format->format.nr_fields; + struct syscall_arg_fmt *fmt = evsel__syscall_arg_fmt(evsel); - evsel->priv = calloc(nr_args, sizeof(struct syscall_arg_fmt)); - if (evsel->priv != NULL) { - syscall_arg_fmt__init_array(evsel->priv, evsel->tp_format->format.fields); + if (fmt != NULL) { + syscall_arg_fmt__init_array(fmt, evsel->tp_format->format.fields); return 0; }