[PATCH 16/39 RESEND] perf tests: Add LLVM test for eBPF on-the-fly compiling
Previous patches introduce llvm__compile_bpf() to compile source file to
eBPF object. This patch adds testcase to test it. It also tests libbpf
by opening generated object after applying next patch which introduces
HAVE_LIBBPF_SUPPORT option.
Since llvm__compile_bpf() prints long messages which users who don't
explicitly test llvm doesn't care, this patch set verbose to -1 to
suppress all debug, warning and error message, and hint user use
'perf test -v' to see the full output.
For the same reason, if clang is not found in PATH and there's no [llvm]
section in .perfconfig, skip this test.
Signed-off-by: Wang Nan
Cc: Alexei Starovoitov
Cc: Brendan Gregg
Cc: Daniel Borkmann
Cc: David Ahern
Cc: He Kuang
Cc: Jiri Olsa
Cc: Kaixu Xia
Cc: Masami Hiramatsu
Cc: Namhyung Kim
Cc: Paul Mackerras
Cc: Peter Zijlstra
Cc: Zefan Li
Cc: pi3or...@163.com
Cc: Arnaldo Carvalho de Melo
Link:
http://lkml.kernel.org/n/1436445342-1402-17-git-send-email-wangn...@huawei.com
---
Suppress error message if clang not found.
---
tools/perf/tests/Build | 1 +
tools/perf/tests/builtin-test.c | 4 ++
tools/perf/tests/llvm.c | 98 +
tools/perf/tests/tests.h| 1 +
tools/perf/util/llvm-utils.c| 9
tools/perf/util/llvm-utils.h| 10 +
6 files changed, 123 insertions(+)
create mode 100644 tools/perf/tests/llvm.c
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index d20d6e6..c1518bd 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -32,6 +32,7 @@ perf-y += sample-parsing.o
perf-y += parse-no-sample-id-all.o
perf-y += kmod-path.o
perf-y += thread-map.o
+perf-y += llvm.o
perf-$(CONFIG_X86) += perf-time-to-tsc.o
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index c1dde73..136cd93 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -175,6 +175,10 @@ static struct test {
.func = test__thread_map,
},
{
+ .desc = "Test LLVM searching and compiling",
+ .func = test__llvm,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
new file mode 100644
index 000..a337356
--- /dev/null
+++ b/tools/perf/tests/llvm.c
@@ -0,0 +1,98 @@
+#include
+#include
+#include
+#include
+#include "tests.h"
+#include "debug.h"
+
+static int perf_config_cb(const char *var, const char *val,
+ void *arg __maybe_unused)
+{
+ return perf_default_config(var, val, arg);
+}
+
+/*
+ * Randomly give it a "version" section since we don't really load it
+ * into kernel
+ */
+static const char test_bpf_prog[] =
+ "__attribute__((section(\"do_fork\"), used)) "
+ "int fork(void *ctx) {return 0;} "
+ "char _license[] __attribute__((section(\"license\"), used)) = \"GPL\";"
+ "int _version __attribute__((section(\"version\"), used)) = 0x40100;";
+
+#ifdef HAVE_LIBBPF_SUPPORT
+static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
+{
+ struct bpf_object *obj;
+
+ obj = bpf_object__open_buffer(obj_buf, obj_buf_sz);
+ if (!obj)
+ return -1;
+ bpf_object__close(obj);
+ return 0;
+}
+#else
+static int test__bpf_parsing(void *obj_buf __maybe_unused,
+size_t obj_buf_sz __maybe_unused)
+{
+ fprintf(stderr, " (skip bpf parsing)");
+ return 0;
+}
+#endif
+
+int test__llvm(void)
+{
+ char *tmpl_new, *clang_opt_new;
+ void *obj_buf;
+ size_t obj_buf_sz;
+ int err, old_verbose;
+
+ perf_config(perf_config_cb, NULL);
+
+ /*
+* Skip this test if user's .perfconfig doesn't set [llvm] section
+* and clang is not found in $PATH, and this is not perf test -v
+*/
+ if (verbose == 0 && !llvm_param.user_set_param && llvm__search_clang())
{
+ fprintf(stderr, " (no clang, try 'perf test -v LLVM')");
+ return TEST_SKIP;
+ }
+
+ old_verbose = verbose;
+ /*
+* llvm is verbosity when error. Suppress all error output if
+* not 'perf test -v'.
+*/
+ if (verbose == 0)
+ verbose = -1;
+
+ if (!llvm_param.clang_bpf_cmd_template)
+ return -1;
+
+ if (!llvm_param.clang_opt)
+ llvm_param.clang_opt = strdup("");
+
+ err = asprintf(_new, "echo '%s' | %s", test_bpf_prog,
+ llvm_param.clang_bpf_cmd_template);
+ if (err < 0)
+ return -1;
+ err = asprintf(_opt_new, "-xc %s", llvm_param.clang_opt);
+ if (err < 0)
+ return -1;
+
+ llvm_param.clang_bpf_cmd_template = tmpl_new;
+ llvm_param.clang_opt = clang_opt_new;
+ err = llvm__compile_bpf("-", _buf, _buf_sz);
+
+ verbose = old_verbose;
+ if (err) {
+ if (!verbose)
+
[PATCH 16/39 RESEND] perf tests: Add LLVM test for eBPF on-the-fly compiling
Previous patches introduce llvm__compile_bpf() to compile source file to
eBPF object. This patch adds testcase to test it. It also tests libbpf
by opening generated object after applying next patch which introduces
HAVE_LIBBPF_SUPPORT option.
Since llvm__compile_bpf() prints long messages which users who don't
explicitly test llvm doesn't care, this patch set verbose to -1 to
suppress all debug, warning and error message, and hint user use
'perf test -v' to see the full output.
For the same reason, if clang is not found in PATH and there's no [llvm]
section in .perfconfig, skip this test.
Signed-off-by: Wang Nan wangn...@huawei.com
Cc: Alexei Starovoitov a...@plumgrid.com
Cc: Brendan Gregg brendan.d.gr...@gmail.com
Cc: Daniel Borkmann dan...@iogearbox.net
Cc: David Ahern dsah...@gmail.com
Cc: He Kuang heku...@huawei.com
Cc: Jiri Olsa jo...@kernel.org
Cc: Kaixu Xia xiaka...@huawei.com
Cc: Masami Hiramatsu masami.hiramatsu...@hitachi.com
Cc: Namhyung Kim namhy...@kernel.org
Cc: Paul Mackerras pau...@samba.org
Cc: Peter Zijlstra a.p.zijls...@chello.nl
Cc: Zefan Li lize...@huawei.com
Cc: pi3or...@163.com
Cc: Arnaldo Carvalho de Melo a...@redhat.com
Link:
http://lkml.kernel.org/n/1436445342-1402-17-git-send-email-wangn...@huawei.com
---
Suppress error message if clang not found.
---
tools/perf/tests/Build | 1 +
tools/perf/tests/builtin-test.c | 4 ++
tools/perf/tests/llvm.c | 98 +
tools/perf/tests/tests.h| 1 +
tools/perf/util/llvm-utils.c| 9
tools/perf/util/llvm-utils.h| 10 +
6 files changed, 123 insertions(+)
create mode 100644 tools/perf/tests/llvm.c
diff --git a/tools/perf/tests/Build b/tools/perf/tests/Build
index d20d6e6..c1518bd 100644
--- a/tools/perf/tests/Build
+++ b/tools/perf/tests/Build
@@ -32,6 +32,7 @@ perf-y += sample-parsing.o
perf-y += parse-no-sample-id-all.o
perf-y += kmod-path.o
perf-y += thread-map.o
+perf-y += llvm.o
perf-$(CONFIG_X86) += perf-time-to-tsc.o
diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
index c1dde73..136cd93 100644
--- a/tools/perf/tests/builtin-test.c
+++ b/tools/perf/tests/builtin-test.c
@@ -175,6 +175,10 @@ static struct test {
.func = test__thread_map,
},
{
+ .desc = Test LLVM searching and compiling,
+ .func = test__llvm,
+ },
+ {
.func = NULL,
},
};
diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
new file mode 100644
index 000..a337356
--- /dev/null
+++ b/tools/perf/tests/llvm.c
@@ -0,0 +1,98 @@
+#include stdio.h
+#include bpf/libbpf.h
+#include util/llvm-utils.h
+#include util/cache.h
+#include tests.h
+#include debug.h
+
+static int perf_config_cb(const char *var, const char *val,
+ void *arg __maybe_unused)
+{
+ return perf_default_config(var, val, arg);
+}
+
+/*
+ * Randomly give it a version section since we don't really load it
+ * into kernel
+ */
+static const char test_bpf_prog[] =
+ __attribute__((section(\do_fork\), used))
+ int fork(void *ctx) {return 0;}
+ char _license[] __attribute__((section(\license\), used)) = \GPL\;
+ int _version __attribute__((section(\version\), used)) = 0x40100;;
+
+#ifdef HAVE_LIBBPF_SUPPORT
+static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
+{
+ struct bpf_object *obj;
+
+ obj = bpf_object__open_buffer(obj_buf, obj_buf_sz);
+ if (!obj)
+ return -1;
+ bpf_object__close(obj);
+ return 0;
+}
+#else
+static int test__bpf_parsing(void *obj_buf __maybe_unused,
+size_t obj_buf_sz __maybe_unused)
+{
+ fprintf(stderr, (skip bpf parsing));
+ return 0;
+}
+#endif
+
+int test__llvm(void)
+{
+ char *tmpl_new, *clang_opt_new;
+ void *obj_buf;
+ size_t obj_buf_sz;
+ int err, old_verbose;
+
+ perf_config(perf_config_cb, NULL);
+
+ /*
+* Skip this test if user's .perfconfig doesn't set [llvm] section
+* and clang is not found in $PATH, and this is not perf test -v
+*/
+ if (verbose == 0 !llvm_param.user_set_param llvm__search_clang())
{
+ fprintf(stderr, (no clang, try 'perf test -v LLVM'));
+ return TEST_SKIP;
+ }
+
+ old_verbose = verbose;
+ /*
+* llvm is verbosity when error. Suppress all error output if
+* not 'perf test -v'.
+*/
+ if (verbose == 0)
+ verbose = -1;
+
+ if (!llvm_param.clang_bpf_cmd_template)
+ return -1;
+
+ if (!llvm_param.clang_opt)
+ llvm_param.clang_opt = strdup();
+
+ err = asprintf(tmpl_new, echo '%s' | %s, test_bpf_prog,
+ llvm_param.clang_bpf_cmd_template);
+ if (err 0)
+ return -1;
+ err = asprintf(clang_opt_new, -xc %s, llvm_param.clang_opt);
+ if (err
