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Date: Tue, 20 Oct 2015 20:06:54 +0800
From: "Wangnan (F)" <wangnan0@...wei.com>
To: Arnaldo Carvalho de Melo <acme@...hat.com>,
Namhyung Kim <namhyung@...nel.org>
CC: <acme@...nel.org>, <ast@...mgrid.com>, <brendan.d.gregg@...il.com>,
<a.p.zijlstra@...llo.nl>, <daniel@...earbox.net>,
<dsahern@...il.com>, <hekuang@...wei.com>, <jolsa@...nel.org>,
<lizefan@...wei.com>, <masami.hiramatsu.pt@...achi.com>,
<paulus@...ba.org>, <linux-kernel@...r.kernel.org>,
<pi3orama@....com>, <xiakaixu@...wei.com>
Subject: Re: [PATCH 21/31] perf test: Enforce LLVM test, add kbuild test
Hi Namhyung and Arnaldo,
I changed my testing related patches in my local git tree. All
changed combined together is at the end of this mail. I remove
all stderr output, and improve debug message. Please have a look
at it.
Thank you.
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
index 5a6290a..453eff8 100644
--- a/tools/perf/tests/bpf.c
+++ b/tools/perf/tests/bpf.c
@@ -49,7 +49,7 @@ static struct bpf_object *prepare_bpf(const char
*name, void *obj_buf,
obj = bpf__prepare_load_buffer(obj_buf, obj_buf_sz, name);
if (IS_ERR(obj)) {
- fprintf(stderr, " (compile failed)");
+ pr_debug("Compile BPF program failed.\n");
return NULL;
}
return obj;
@@ -82,7 +82,7 @@ static int do_test(struct bpf_object *obj, int
(*func)(void), int expect)
err = parse_events_load_bpf_obj(&parse_evlist, &parse_evlist.list,
obj);
if (err || list_empty(&parse_evlist.list)) {
- fprintf(stderr, " (Failed to add events selected by BPF)");
+ pr_debug("Failed to add events selected by BPF\n");
if (!err)
err = -EINVAL;
goto out;
@@ -140,7 +140,7 @@ static int do_test(struct bpf_object *obj, int
(*func)(void), int expect)
}
if (count != expect) {
- fprintf(stderr, " (filter result incorrect: %d != %d)", count,
expect);
+ pr_debug("BPF filter result incorrect: %d != %d\n", count, expect);
err = -EBADF;
}
@@ -164,16 +164,14 @@ static int __test__bpf(int index, const char *name,
test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz, index);
if (!obj_buf || !obj_buf_sz) {
- if (verbose == 0)
- fprintf(stderr, " (%s)", message_compile);
+ pr_debug("Failed to compile: %s\n", message_compile);
return TEST_SKIP;
}
obj = prepare_bpf(name, obj_buf, obj_buf_sz);
if (!obj) {
err = -EINVAL;
- if ((verbose == 0) && (message_load[0] != '\0'))
- fprintf(stderr, " (%s)", message_load);
+ pr_debug("Failed to load: %s", message_load);
goto out;
}
@@ -192,7 +190,7 @@ int test__bpf(void)
int err;
if (geteuid() != 0) {
- fprintf(stderr, " (try run as root)");
+ pr_debug("Only root can run BPF test\n");
return TEST_SKIP;
}
@@ -214,7 +212,7 @@ int test__bpf(void)
(NR_ITERS + 1) / 4);
return err;
#else
- fprintf(stderr, " (skip BPF prologue test)");
+ pr_debug("BPF prologue is disabled when compiling, skip this test\n");
return TEST_OK;
#endif
}
diff --git a/tools/perf/tests/llvm.c b/tools/perf/tests/llvm.c
index e722e8a..7c3b2c3 100644
--- a/tools/perf/tests/llvm.c
+++ b/tools/perf/tests/llvm.c
@@ -13,19 +13,23 @@
struct llvm_testcase {
const char *source;
const char *errmsg;
+ const char *hintmsg;
struct test_llvm__bpf_result *result;
bool tried;
} llvm_testcases[NR_LLVM_TESTCASES + 1] = {
[LLVM_TESTCASE_BASE] = {.source = test_llvm__bpf_prog,
.errmsg = "Basic LLVM compiling failed",
+ .hintmsg = "Check llvm.clang-path option in
~/.perfconfig",
.tried = false},
[LLVM_TESTCASE_KBUILD] = {.source =
test_llvm__bpf_test_kbuild_prog,
- .errmsg = "llvm.kbuild-dir can be fixed",
+ .errmsg = "Unable to find usable kbuild dir",
+ .hintmsg = "Check llvm.kbuild-dir option in
~/.perfconfig",
.tried = false},
/* Don't output if this one fail. */
[LLVM_TESTCASE_BPF_PROLOGUE] = {
.source = test_llvm__bpf_test_prologue_prog,
- .errmsg = "failed for unknown reason",
+ .errmsg = "Unable to compile BPF prologue testing
program",
+ .hintmsg = "This is an internal error, please report
it",
.tried = false},
{.source = NULL}
};
@@ -43,16 +47,16 @@ static int test__bpf_parsing(void *obj_buf, size_t
obj_buf_sz)
obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
if (!obj)
- return -1;
+ return TEST_FAIL;
bpf_object__close(obj);
- return 0;
+ return TEST_OK;
}
#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;
+ pr_debug("BPF support is not compiled, skip BPF parsing\n");
+ return TEST_SKIP;
}
#endif
@@ -70,8 +74,8 @@ compose_source(const char *raw_source)
err = sscanf(utsname.release, "%d.%d.%d",
&version, &patchlevel, &sublevel);
if (err != 3) {
- fprintf(stderr, " (Can't get kernel version from uname '%s')",
- utsname.release);
+ pr_debug("Unablt to get kernel version from uname '%s'\n",
+ utsname.release);
return NULL;
}
@@ -104,7 +108,7 @@ static int __test__llvm(int i)
* 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')");
+ pr_debug("Unable to find workable clang\n");
return TEST_SKIP;
}
@@ -155,7 +159,7 @@ static int __test__llvm(int i)
verbose = old_verbose;
if (err)
- return -1;
+ return TEST_FAIL;
err = test__bpf_parsing(obj_buf, obj_buf_sz);
if (!err && result) {
@@ -181,13 +185,12 @@ int test__llvm(void)
* First testcase tests basic LLVM compiling. If it
* fails, no need to check others.
*/
- if (!verbose)
- fprintf(stderr, " (use -v to see error message)");
- return ret;
+ return TEST_FAIL;
} else if (ret) {
- if (!verbose && llvm_testcases[i].errmsg)
- fprintf(stderr, " (%s)", llvm_testcases[i].errmsg);
- return 0;
+ pr_debug("%s\n", llvm_testcases[i].errmsg);
+ if (llvm_testcases[i].hintmsg)
+ pr_debug("Hint:\t%s\n", llvm_testcases[i].hintmsg);
+ return TEST_SKIP;
}
}
return 0;
@@ -199,12 +202,15 @@ void test__llvm_prepare(void)
for (i = 0; llvm_testcases[i].source; i++) {
struct test_llvm__bpf_result *result;
+ void *p;
- result = mmap(NULL, SHARED_BUF_INIT_SIZE,
- PROT_READ | PROT_WRITE,
- MAP_SHARED | MAP_ANONYMOUS, -1, 0);
- if (!result)
+ p = mmap(NULL, SHARED_BUF_INIT_SIZE,
+ PROT_READ | PROT_WRITE,
+ MAP_SHARED | MAP_ANONYMOUS, -1, 0);
+ if (p == MAP_FAILED)
return;
+
+ result = p;
memset((void *)result, '\0', SHARED_BUF_INIT_SIZE);
llvm_testcases[i].result = result;
diff --git a/tools/perf/util/bpf-prologue.c b/tools/perf/util/bpf-prologue.c
index e4adb18..36093d9 100644
--- a/tools/perf/util/bpf-prologue.c
+++ b/tools/perf/util/bpf-prologue.c
@@ -337,8 +337,10 @@ int bpf__gen_prologue(struct probe_trace_arg *args,
int nargs,
return 0;
}
- if (nargs > BPF_PROLOGUE_MAX_ARGS)
+ if (nargs > BPF_PROLOGUE_MAX_ARGS) {
+ pr_warning("bpf: prologue: too many arguments\n");
nargs = BPF_PROLOGUE_MAX_ARGS;
+ }
if (cnt_space > BPF_MAXINSNS)
cnt_space = BPF_MAXINSNS;
--
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