perf tools: Enable libtraceevent dynamic linking

Currently we support only static linking with kernel's libtraceevent
(tools/lib/traceevent). This patch adds libtraceevent package detection
and support to link perf with it dynamically.

  The libtraceevent package status is displayed with:
  $ make VF=1 LIBTRACEEVENT_DYNAMIC=1
  ...
  ...                 libtraceevent: [ on  ]

Default behavior remains the same (static linking).

Committer testing:

  $ make LIBTRACEEVENT_DYNAMIC=1 VF=1 O=/tmp/build/perf -C tools/perf install-bin |& grep traceevent
  Makefile.config:1090: *** Error: No libtraceevent devel library found, please install libtraceevent-devel.  Stop.
  $

Signed-off-by: Michael Petlan <mpetlan@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
LPU-Reference: 20210428092023.4009-1-mpetlan@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/build/Makefile.feature b/tools/build/Makefile.feature
index 74e255d..b3221a4 100644 (file)
--- a/tools/build/Makefile.feature
+++ b/tools/build/Makefile.feature
@@ -52,6 +52,7 @@ FEATURE_TESTS_BASIC :=                  \
         libpython-version               \
         libslang                        \
         libslang-include-subdir         \
+        libtraceevent                   \
         libcrypto                       \
         libunwind                       \
         pthread-attr-setaffinity-np     \

diff --git a/tools/build/feature/Makefile b/tools/build/feature/Makefile
index 3e55edb..ec203e2 100644 (file)
--- a/tools/build/feature/Makefile
+++ b/tools/build/feature/Makefile
@@ -36,6 +36,7 @@ FILES=                                          \
          test-libpython-version.bin             \
          test-libslang.bin                      \
          test-libslang-include-subdir.bin       \
+         test-libtraceevent.bin                 \
          test-libcrypto.bin                     \
          test-libunwind.bin                     \
          test-libunwind-debug-frame.bin         \
@@ -196,6 +197,9 @@ $(OUTPUT)test-libslang.bin:
 $(OUTPUT)test-libslang-include-subdir.bin:
        $(BUILD) -lslang
 
+$(OUTPUT)test-libtraceevent.bin:
+       $(BUILD) -ltraceevent
+
 $(OUTPUT)test-libcrypto.bin:
        $(BUILD) -lcrypto
 

diff --git a/tools/build/feature/test-libtraceevent.c b/tools/build/feature/test-libtraceevent.c
new file mode 100644 (file)
index 0000000..416b11f
--- /dev/null
+++ b/tools/build/feature/test-libtraceevent.c
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <traceevent/trace-seq.h>
+
+int main(void)
+{
+       int rv = 0;
+       struct trace_seq s;
+       trace_seq_init(&s);
+       rv += !(s.state == TRACE_SEQ__GOOD);
+       trace_seq_destroy(&s);
+       return rv;
+}

diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
index 3514fe9..99c73a7 100644 (file)
--- a/tools/perf/Makefile.config
+++ b/tools/perf/Makefile.config
@@ -1079,6 +1079,15 @@ ifdef LIBPFM4
   endif
 endif
 
+ifdef LIBTRACEEVENT_DYNAMIC
+  $(call feature_check,libtraceevent)
+  ifeq ($(feature-libtraceevent), 1)
+    EXTLIBS += -ltraceevent
+  else
+    dummy := $(error Error: No libtraceevent devel library found, please install libtraceevent-devel);
+  endif
+endif
+
 # Among the variables below, these:
 #   perfexecdir
 #   perf_include_dir

diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
index 6240fbb..e47f04e 100644 (file)
--- a/tools/perf/Makefile.perf
+++ b/tools/perf/Makefile.perf
@@ -128,6 +128,8 @@ include ../scripts/utilities.mak
 #
 # Define BUILD_BPF_SKEL to enable BPF skeletons
 #
+# Define LIBTRACEEVENT_DYNAMIC to enable libtraceevent dynamic linking
+#
 
 # As per kernel Makefile, avoid funny character set dependencies
 unexport LC_ALL
@@ -310,7 +312,6 @@ endif
 
 LIBTRACEEVENT = $(TE_PATH)libtraceevent.a
 export LIBTRACEEVENT
-
 LIBTRACEEVENT_DYNAMIC_LIST = $(PLUGINS_PATH)libtraceevent-dynamic-list
 
 #
@@ -375,12 +376,15 @@ endif
 
 export PERL_PATH
 
-PERFLIBS = $(LIBAPI) $(LIBTRACEEVENT) $(LIBSUBCMD) $(LIBPERF)
+PERFLIBS = $(LIBAPI) $(LIBSUBCMD) $(LIBPERF)
 ifndef NO_LIBBPF
   ifndef LIBBPF_DYNAMIC
     PERFLIBS += $(LIBBPF)
   endif
 endif
+ifndef LIBTRACEEVENT_DYNAMIC
+  PERFLIBS += $(LIBTRACEEVENT)
+endif
 
 # We choose to avoid "if .. else if .. else .. endif endif"
 # because maintaining the nesting to match is a pain.  If