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

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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: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-08-07 16:21:44 -03:00
parent 78e890ea86
commit d3d1c4bdf5
1 changed files with 33 additions and 1 deletions
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34
tools/perf/builtin-trace.c
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@ -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));