Commit d3d1c4bd authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo
Browse files

perf trace: Setup the augmented syscalls bpf-output event fields 

The payload that is put in place by the eBPF script attached to
syscalls:sys_enter_openat (and other syscalls with pointers, in the
future) can be consumed by the existing sys_enter beautifiers if
evsel->priv is setup with a struct syscall_tp with struct tp_fields for
the 'syscall_id' and 'args' fields expected by the beautifiers, this
patch does just that.

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: https://lkml.kernel.org/n/tip-xfjyog8oveg2fjys9r1yy1es@git.kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 78e890ea

tools/perf/builtin-trace.c

+33 −1
Original line number Diff line number Diff line
@@ -77,7 +77,8 @@ struct trace { 
		struct syscall  *table;

		struct {

			struct perf_evsel *sys_enter,

					  *sys_exit;

					  *sys_exit,

					  *augmented;

		}		events;

	} syscalls;

	struct record_opts	opts;
@@ -263,6 +264,30 @@ out_delete: 
	return -ENOENT;

}



static int perf_evsel__init_augmented_syscall_tp(struct perf_evsel *evsel)

{

	struct syscall_tp *sc = evsel->priv = malloc(sizeof(struct syscall_tp));



	if (evsel->priv != NULL) {       /* field, sizeof_field, offsetof_field */

		if (__tp_field__init_uint(&sc->id, sizeof(long), sizeof(long long), evsel->needs_swap))

			goto out_delete;



		return 0;

	}



	return -ENOMEM;

out_delete:

	zfree(&evsel->priv);

	return -EINVAL;

}



static int perf_evsel__init_augmented_syscall_tp_args(struct perf_evsel *evsel)

{

	struct syscall_tp *sc = evsel->priv;



	return __tp_field__init_ptr(&sc->args, sc->id.offset + sizeof(u64));

}



static int perf_evsel__init_raw_syscall_tp(struct perf_evsel *evsel, void *handler)

{

	evsel->priv = malloc(sizeof(struct syscall_tp));
@@ -3248,6 +3273,13 @@ int cmd_trace(int argc, const char **argv) 
		goto out;

	}



	if (evsel) {

		if (perf_evsel__init_augmented_syscall_tp(evsel) ||

		    perf_evsel__init_augmented_syscall_tp_args(evsel))

			goto out;

		trace.syscalls.events.augmented = evsel;

	}



	err = bpf__setup_stdout(trace.evlist);

	if (err) {

		bpf__strerror_setup_stdout(trace.evlist, err, bf, sizeof(bf));

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