perf test: Enhance the LLVM test: update basic BPF test program
This patch replaces the original toy BPF program with the previously
introduced bpf-script-example.c. Dynamically embeddeding it into
'llvm-src-base.c'.
The newly introduced BPF program attaches a BPF program to
'sys_epoll_pwait()'. perf itself never use that syscall, so further test
can verify their result with it. The program would generate 1 sample in
every 2 calls of epoll_pwait() system call.
Since the resulting BPF object is useful per se for further tests,
test_llvm__fetch_bpf_obj() is introduced for creating BPF objects from
source. The LLVM test was rewritten to use it.
Committer note:
Running it:
[root@zoo wb]# perf test -v LLVM
35: Test LLVM searching and compiling :
--- start ---
test child forked, pid 17740
Kernel build dir is set to /lib/modules/4.3.0-rc1+/build
set env: KBUILD_DIR=/lib/modules/4.3.0-rc1+/build
unset env: KBUILD_OPTS
include option is set to -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.9.2/include -I/home/git/linux/arch/x86/include -Iarch/x86/include/generated/uapi -Iarch/x86/include/generated -I/home/git/linux/include -Iinclude -I/home/git/linux/arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I/home/git/linux/include/uapi -Iinclude/generated/uapi -include /home/git/linux/include/linux/kconfig.h
set env: NR_CPUS=4
set env: LINUX_VERSION_CODE=0x40300
set env: CLANG_EXEC=/usr/libexec/icecc/bin/clang
set env: CLANG_OPTIONS=-xc
set env: KERNEL_INC_OPTIONS= -nostdinc -isystem /usr/lib/gcc/x86_64-redhat-linux/4.9.2/include -I/home/git/linux/arch/x86/include -Iarch/x86/include/generated/uapi -Iarch/x86/include/generated -I/home/git/linux/include -Iinclude -I/home/git/linux/arch/x86/include/uapi -Iarch/x86/include/generated/uapi -I/home/git/linux/include/uapi -Iinclude/generated/uapi -include /home/git/linux/include/linux/kconfig.h
set env: WORKING_DIR=/lib/modules/4.3.0-rc1+/build
set env: CLANG_SOURCE=-
llvm compiling command template: echo '/*
* bpf-script-example.c
* Test basic LLVM building
*/
#ifndef LINUX_VERSION_CODE
# error Need LINUX_VERSION_CODE
# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
#endif
#define BPF_ANY 0
#define BPF_MAP_TYPE_ARRAY 2
#define BPF_FUNC_map_lookup_elem 1
#define BPF_FUNC_map_update_elem 2
static void *(*bpf_map_lookup_elem)(void *map, void *key) =
(void *) BPF_FUNC_map_lookup_elem;
static void *(*bpf_map_update_elem)(void *map, void *key, void *value, int flags) =
(void *) BPF_FUNC_map_update_elem;
struct bpf_map_def {
unsigned int type;
unsigned int key_size;
unsigned int value_size;
unsigned int max_entries;
};
#define SEC(NAME) __attribute__((section(NAME), used))
struct bpf_map_def SEC("maps") flip_table = {
.type = BPF_MAP_TYPE_ARRAY,
.key_size = sizeof(int),
.value_size = sizeof(int),
.max_entries = 1,
};
SEC("func=sys_epoll_pwait")
int bpf_func__sys_epoll_pwait(void *ctx)
{
int ind =0;
int *flag = bpf_map_lookup_elem(&flip_table, &ind);
int new_flag;
if (!flag)
return 0;
/* flip flag and store back */
new_flag = !*flag;
bpf_map_update_elem(&flip_table, &ind, &new_flag, BPF_ANY);
return new_flag;
}
char _license[] SEC("license") = "GPL";
int _version SEC("version") = LINUX_VERSION_CODE;
' | $CLANG_EXEC -D__KERNEL__ -D__NR_CPUS__=$NR_CPUS -DLINUX_VERSION_CODE=$LINUX_VERSION_CODE $CLANG_OPTIONS $KERNEL_INC_OPTIONS -Wno-unused-value -Wno-pointer-sign -working-directory $WORKING_DIR -c "$CLANG_SOURCE" -target bpf -O2 -o -
test child finished with 0
---- end ----
Test LLVM searching and compiling: Ok
[root@zoo wb]#
Signed-off-by: Wang Nan <wangnan0@huawei.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
Link: http://lkml.kernel.org/r/1446817783-86722-6-git-send-email-wangnan0@huawei.com
Signed-off-by: He Kuang <hekuang@huawei.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Wang Nan
Arnaldo Carvalho de Melo
parent
d3e0ce3930
commit
b31de018a6
@ -31,9 +31,16 @@ perf-y += sample-parsing.o
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perf-y += parse-no-sample-id-all.o
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perf-y += kmod-path.o
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perf-y += thread-map.o
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perf-y += llvm.o
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perf-y += llvm.o llvm-src-base.o
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perf-y += topology.o
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$(OUTPUT)tests/llvm-src-base.c: tests/bpf-script-example.c
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$(call rule_mkdir)
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$(Q)echo '#include <tests/llvm.h>' > $@
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$(Q)echo 'const char test_llvm__bpf_base_prog[] =' >> $@
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$(Q)sed -e 's/"/\\"/g' -e 's/\(.*\)/"\1\\n"/g' $< >> $@
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$(Q)echo ';' >> $@
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ifeq ($(ARCH),$(filter $(ARCH),x86 arm arm64))
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perf-$(CONFIG_DWARF_UNWIND) += dwarf-unwind.o
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endif
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@ -1,3 +1,7 @@
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/*
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* bpf-script-example.c
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* Test basic LLVM building
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*/
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#ifndef LINUX_VERSION_CODE
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# error Need LINUX_VERSION_CODE
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# error Example: for 4.2 kernel, put 'clang-opt="-DLINUX_VERSION_CODE=0x40200" into llvm section of ~/.perfconfig'
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@ -2,6 +2,7 @@
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#include <bpf/libbpf.h>
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#include <util/llvm-utils.h>
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#include <util/cache.h>
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#include "llvm.h"
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#include "tests.h"
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#include "debug.h"
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@ -11,16 +12,6 @@ static int perf_config_cb(const char *var, const char *val,
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return perf_default_config(var, val, arg);
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}
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/*
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* Randomly give it a "version" section since we don't really load it
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* into kernel
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*/
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static const char test_bpf_prog[] =
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"__attribute__((section(\"do_fork\"), used)) "
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"int fork(void *ctx) {return 0;} "
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"char _license[] __attribute__((section(\"license\"), used)) = \"GPL\";"
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"int _version __attribute__((section(\"version\"), used)) = 0x40100;";
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#ifdef HAVE_LIBBPF_SUPPORT
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static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
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{
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@ -28,25 +19,47 @@ static int test__bpf_parsing(void *obj_buf, size_t obj_buf_sz)
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obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, NULL);
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if (IS_ERR(obj))
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return -1;
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return TEST_FAIL;
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bpf_object__close(obj);
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return 0;
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return TEST_OK;
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}
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#else
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static int test__bpf_parsing(void *obj_buf __maybe_unused,
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size_t obj_buf_sz __maybe_unused)
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{
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pr_debug("Skip bpf parsing\n");
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return 0;
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return TEST_OK;
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}
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#endif
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int test__llvm(void)
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static struct {
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const char *source;
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const char *desc;
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} bpf_source_table[__LLVM_TESTCASE_MAX] = {
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[LLVM_TESTCASE_BASE] = {
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.source = test_llvm__bpf_base_prog,
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.desc = "Basic BPF llvm compiling test",
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},
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};
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int
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test_llvm__fetch_bpf_obj(void **p_obj_buf,
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size_t *p_obj_buf_sz,
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enum test_llvm__testcase index,
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bool force)
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{
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char *tmpl_new, *clang_opt_new;
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void *obj_buf;
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size_t obj_buf_sz;
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int err, old_verbose;
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const char *source;
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const char *desc;
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const char *tmpl_old, *clang_opt_old;
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char *tmpl_new = NULL, *clang_opt_new = NULL;
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int err, old_verbose, ret = TEST_FAIL;
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if (index >= __LLVM_TESTCASE_MAX)
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return TEST_FAIL;
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source = bpf_source_table[index].source;
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desc = bpf_source_table[index].desc;
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perf_config(perf_config_cb, NULL);
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@ -54,42 +67,100 @@ int test__llvm(void)
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* Skip this test if user's .perfconfig doesn't set [llvm] section
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* and clang is not found in $PATH, and this is not perf test -v
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*/
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if (verbose == 0 && !llvm_param.user_set_param && llvm__search_clang()) {
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if (!force && (verbose == 0 &&
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!llvm_param.user_set_param &&
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llvm__search_clang())) {
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pr_debug("No clang and no verbosive, skip this test\n");
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return TEST_SKIP;
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}
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old_verbose = verbose;
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/*
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* llvm is verbosity when error. Suppress all error output if
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* not 'perf test -v'.
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*/
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old_verbose = verbose;
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if (verbose == 0)
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verbose = -1;
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*p_obj_buf = NULL;
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*p_obj_buf_sz = 0;
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if (!llvm_param.clang_bpf_cmd_template)
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return -1;
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goto out;
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if (!llvm_param.clang_opt)
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llvm_param.clang_opt = strdup("");
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err = asprintf(&tmpl_new, "echo '%s' | %s", test_bpf_prog,
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llvm_param.clang_bpf_cmd_template);
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err = asprintf(&tmpl_new, "echo '%s' | %s%s", source,
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llvm_param.clang_bpf_cmd_template,
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old_verbose ? "" : " 2>/dev/null");
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if (err < 0)
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return -1;
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goto out;
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err = asprintf(&clang_opt_new, "-xc %s", llvm_param.clang_opt);
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if (err < 0)
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return -1;
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goto out;
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tmpl_old = llvm_param.clang_bpf_cmd_template;
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llvm_param.clang_bpf_cmd_template = tmpl_new;
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clang_opt_old = llvm_param.clang_opt;
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llvm_param.clang_opt = clang_opt_new;
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err = llvm__compile_bpf("-", &obj_buf, &obj_buf_sz);
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err = llvm__compile_bpf("-", p_obj_buf, p_obj_buf_sz);
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llvm_param.clang_bpf_cmd_template = tmpl_old;
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llvm_param.clang_opt = clang_opt_old;
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verbose = old_verbose;
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if (err)
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return TEST_FAIL;
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goto out;
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err = test__bpf_parsing(obj_buf, obj_buf_sz);
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free(obj_buf);
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return err;
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ret = TEST_OK;
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out:
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free(tmpl_new);
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free(clang_opt_new);
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if (ret != TEST_OK)
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pr_debug("Failed to compile test case: '%s'\n", desc);
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return ret;
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}
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int test__llvm(void)
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{
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enum test_llvm__testcase i;
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for (i = 0; i < __LLVM_TESTCASE_MAX; i++) {
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int ret;
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void *obj_buf = NULL;
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size_t obj_buf_sz = 0;
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ret = test_llvm__fetch_bpf_obj(&obj_buf, &obj_buf_sz,
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i, false);
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if (ret == TEST_OK) {
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ret = test__bpf_parsing(obj_buf, obj_buf_sz);
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if (ret != TEST_OK)
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pr_debug("Failed to parse test case '%s'\n",
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bpf_source_table[i].desc);
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}
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free(obj_buf);
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switch (ret) {
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case TEST_SKIP:
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return TEST_SKIP;
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case TEST_OK:
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break;
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default:
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/*
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* Test 0 is the basic LLVM test. If test 0
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* fail, the basic LLVM support not functional
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* so the whole test should fail. If other test
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* case fail, it can be fixed by adjusting
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* config so don't report error.
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*/
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if (i == 0)
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return TEST_FAIL;
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else
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return TEST_SKIP;
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}
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}
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return TEST_OK;
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}
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16
tools/perf/tests/llvm.h
Normal file
16
tools/perf/tests/llvm.h
Normal file
@ -0,0 +1,16 @@
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#ifndef PERF_TEST_LLVM_H
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#define PERF_TEST_LLVM_H
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#include <stddef.h> /* for size_t */
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#include <stdbool.h> /* for bool */
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extern const char test_llvm__bpf_base_prog[];
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enum test_llvm__testcase {
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LLVM_TESTCASE_BASE,
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__LLVM_TESTCASE_MAX,
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};
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int test_llvm__fetch_bpf_obj(void **p_obj_buf, size_t *p_obj_buf_sz,
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enum test_llvm__testcase index, bool force);
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#endif
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