Re: [PATCH 2/3] perf build: Use libtraceevent from the system

Arnaldo Carvalho de Melo
2022-12-08T22:32:26Z

Em Thu, Dec 08, 2022 at 07:04:52PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Thu, Dec 08, 2022 at 12:21:20PM +0530, Athira Rajeev escreveu:
> > > On 07-Dec-2022, at 10:57 PM, Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> > > Can you try again? tmp.perf/core? That "tmp." part means its a force
> > > pushed branch, so I just force pushed with some arch specific fixes, now
> > > I'm down to (removing the successful builds and unrelated failures, now
> > > related to libbpf's F_DUPFD_CLOEXEC kaboom):
>
> > Ok Arnaldo, Sure, I will check with updated branch
>
> > > 5 7.38 fedora:34 : FAIL gcc version 11.3.1 20220421 (Red Hat 11.3.1-2) (GCC)
> > > /git/perf-6.1.0-rc6/tools/perf/util/evsel.c: In function ‘evsel__rawptr’:
> > > /git/perf-6.1.0-rc6/tools/perf/util/evsel.c:2787:36: error: ‘TEP_FIELD_IS_RELATIVE’ undeclared (first use in this function); did you mean ‘TEP_FIELD_IS_FLAG’?
> > > 2787 | if (field->flags & TEP_FIELD_IS_RELATIVE)
> > > | ^~~~~~~~~~~~~~~~~~~~~
> > > | TEP_FIELD_IS_FLAG
>
> > I observed same issue as updated here:
> > https://lore.kernel.org/lkml/10476A85-3F75-4C91-AB5B-E5B136F31297@linux.vnet.ibm.com/
>
> > Looks like TEP_FIELD_IS_RELATIVE is not defined in header file of the system installed version.
> > whereas it is there in header file in tools/lib/traceevent
>
> > # grep TEP_FIELD_IS_RELATIVE /usr/include/traceevent/event-parse.h
> > # grep TEP_FIELD_IS_RELATIVE ../lib/traceevent/event-parse.h
> > TEP_FIELD_IS_RELATIVE = 256,
>
> Right, I had noticed that as well, so as a prep patch I'm adding the
> patch below, before Ian's. Please check and provide an
> Acked-by/Tested-by/Reviewed-by if possible.

I ended up with the one below, _after_ Ian's patch as I had some trouble grafting
it before and had already tested it this way multiple times, I'm pushing
this to tmp/perf.core.

- Arnaldo

commit a0ec3ef4590e7e82339b6f318e671a6b69fd94e8
Author: Arnaldo Carvalho de Melo <acme@redhat.com>
Date: Thu Dec 8 19:28:58 2022 -0300

perf tools: Add test to check if libtracevent has TEP_FIELD_IS_RELATIVE

Some distros have older versions of libtraceevent where
TEP_FIELD_IS_RELATIVE and its associated semantics are not present, so
we need to test for its presence and cope when it isn't present when
building with LIBTRACEEVENT_DYNAMIC=1.

Reported-by: Athira Jajeev <atrajeev@linux.vnet.ibm.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 38f8851bd7cbdb0e..c6c9b7c7723d4290 100644
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -71,7 +71,8 @@ FEATURE_TESTS_BASIC := \
libzstd \
disassembler-four-args \
disassembler-init-styled \
- file-handle
+ file-handle \
+ libtraceevent-tep_field_is_relative

# FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
# of all feature tests
diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 690fe97be1904399..24246df35ac30eeb 100644
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -81,7 +81,8 @@ FILES= \
test-libzstd.bin \
test-clang-bpf-co-re.bin \
test-file-handle.bin \
- test-libpfm4.bin
+ test-libpfm4.bin \
+ test-libtraceevent-tep_field_is_relative

FILES := $(addprefix $(OUTPUT),$(FILES))

@@ -159,6 +160,9 @@ $(OUTPUT)test-dwarf_getlocations.bin:
$(OUTPUT)test-libelf-getphdrnum.bin:
$(BUILD) -lelf

+$(OUTPUT)test-libtraceevent-tep_field_is_relative.bin:
+ $(BUILD) -ltraceevent
+
$(OUTPUT)test-libelf-gelf_getnote.bin:
$(BUILD) -lelf

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 680228e19c1aabdb..e29975664f06bd61 100644
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -1197,6 +1197,10 @@ ifneq ($(NO_LIBTRACEEVENT),1)
LIBTRACEEVENT_VERSION_CPP := $(shell expr $(LIBTRACEEVENT_VERSION_1) \* 255 \* 255 + $(LIBTRACEEVENT_VERSION_2) \* 255 + $(LIBTRACEEVENT_VERSION_3))
CFLAGS += -DLIBTRACEEVENT_VERSION=$(LIBTRACEEVENT_VERSION_CPP)
$(call detected,CONFIG_LIBTRACEEVENT)
+ $(call feature_check,libtraceevent-tep_field_is_relative)
+ ifeq ($(feature-libtraceevent-tep_field_is_relative), 1)
+ CFLAGS += -DHAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
+ endif
else
dummy := $(warning Warning: libtraceevent is missing limiting functionality, please install libtraceevent-dev/libtraceevent-devel)
endif
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index 6909cd9f48d11644..c9802ab549d7782f 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2729,8 +2729,10 @@ static size_t trace__fprintf_tp_fields(struct trace *trace, struct evsel *evsel,
offset = format_field__intval(field, sample, evsel->needs_swap);
syscall_arg.len = offset >> 16;
offset &= 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
+#endif
}

val = (uintptr_t)(sample->raw_data + offset);
diff --git a/tools/perf/util/data-convert-bt.c b/tools/perf/util/data-convert-bt.c
index 8031b586e81384e7..b842273458b862bd 100644
--- a/tools/perf/util/data-convert-bt.c
+++ b/tools/perf/util/data-convert-bt.c
@@ -322,8 +322,10 @@ static int add_tracepoint_field_value(struct ctf_writer *cw,
offset = tmp_val;
len = offset >> 16;
offset &= 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (flags & TEP_FIELD_IS_RELATIVE)
offset += fmtf->offset + fmtf->size;
+#endif
}

if (flags & TEP_FIELD_IS_ARRAY) {
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index ca911856c4b1d3c8..77b2cf5a214ec1e4 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -2784,8 +2784,10 @@ void *evsel__rawptr(struct evsel *evsel, struct perf_sample *sample, const char
if (field->flags & TEP_FIELD_IS_DYNAMIC) {
offset = *(int *)(sample->raw_data + field->offset);
offset &= 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
+#endif
}

return sample->raw_data + offset;
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 6fb84b7455b8392d..7320f7f777fe0e56 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -442,8 +442,10 @@ tracepoint_field(struct pyrf_event *pe, struct tep_format_field *field)
offset = val;
len = offset >> 16;
offset &= 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
+#endif
}
if (field->flags & TEP_FIELD_IS_STRING &&
is_printable_array(data + offset, len)) {
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index 0bacb49408f84adf..c097b7934fd4ebe9 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -393,8 +393,10 @@ static void perl_process_tracepoint(struct perf_sample *sample,
if (field->flags & TEP_FIELD_IS_DYNAMIC) {
offset = *(int *)(data + field->offset);
offset &= 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
+#endif
} else
offset = field->offset;
XPUSHs(sv_2mortal(newSVpv((char *)data + offset, 0)));
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index fabba21919b8fa51..e930f5f1f36d2831 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -994,8 +994,10 @@ static void python_process_tracepoint(struct perf_sample *sample,
offset = val;
len = offset >> 16;
offset &= 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
+#endif
}
if (field->flags & TEP_FIELD_IS_STRING &&
is_printable_array(data + offset, len)) {
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index c7a97b33e13477e1..0ecc2cb137920d2d 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -2568,9 +2568,10 @@ static int64_t __sort__hde_cmp(struct perf_hpp_fmt *fmt,
tep_read_number_field(field, a->raw_data, &dyn);
offset = dyn & 0xffff;
size = (dyn >> 16) & 0xffff;
+#ifdef HAVE_LIBTRACEEVENT_TEP_FIELD_IS_RELATIVE
if (field->flags & TEP_FIELD_IS_RELATIVE)
offset += field->offset + field->size;
-
+#endif
/* record max width for output */
if (size > hde->dynamic_len)
hde->dynamic_len = size;