From 2bd42de0e196f89994cbae1990d2c7c5a9b6a529 Mon Sep 17 00:00:00 2001 From: Wang Nan Date: Sat, 26 Nov 2016 07:03:30 +0000 Subject: [PATCH] perf llvm: Extract helpers in llvm-utils.c The following commits will use builtin clang to compile BPF scripts. llvm__get_kbuild_opts() and llvm__get_nr_cpus() are extracted to help building '-DKERNEL_VERSION_CODE' and '-D__NR_CPUS__' macros. Doing object dumping in bpf loader, so further builtin clang compiling needn't consider it. Signed-off-by: Wang Nan Cc: Alexei Starovoitov Cc: He Kuang Cc: Jiri Olsa Cc: Joe Stringer Cc: Zefan Li Cc: pi3orama@163.com Link: http://lkml.kernel.org/r/20161126070354.141764-7-wangnan0@huawei.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/bpf-loader.c | 4 ++ tools/perf/util/llvm-utils.c | 76 +++++++++++++++++++++++++++--------- tools/perf/util/llvm-utils.h | 6 +++ 3 files changed, 68 insertions(+), 18 deletions(-) diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c index a5fd275238f7..cf16b94115b5 100644 --- a/tools/perf/util/bpf-loader.c +++ b/tools/perf/util/bpf-loader.c @@ -90,6 +90,10 @@ struct bpf_object *bpf__prepare_load(const char *filename, bool source) if (err) return ERR_PTR(-BPF_LOADER_ERRNO__COMPILE); obj = bpf_object__open_buffer(obj_buf, obj_buf_sz, filename); + + if (!IS_ERR(obj) && llvm_param.dump_obj) + llvm__dump_obj(filename, obj_buf, obj_buf_sz); + free(obj_buf); } else obj = bpf_object__open(filename); diff --git a/tools/perf/util/llvm-utils.c b/tools/perf/util/llvm-utils.c index 27b6f303720a..b23ff44cf214 100644 --- a/tools/perf/util/llvm-utils.c +++ b/tools/perf/util/llvm-utils.c @@ -7,6 +7,7 @@ #include #include #include +#include #include "debug.h" #include "llvm-utils.h" #include "config.h" @@ -282,9 +283,10 @@ static const char *kinc_fetch_script = "rm -rf $TMPDIR\n" "exit $RET\n"; -static inline void -get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts) +void llvm__get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts) { + static char *saved_kbuild_dir; + static char *saved_kbuild_include_opts; int err; if (!kbuild_dir || !kbuild_include_opts) @@ -293,10 +295,28 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts) *kbuild_dir = NULL; *kbuild_include_opts = NULL; + if (saved_kbuild_dir && saved_kbuild_include_opts && + !IS_ERR(saved_kbuild_dir) && !IS_ERR(saved_kbuild_include_opts)) { + *kbuild_dir = strdup(saved_kbuild_dir); + *kbuild_include_opts = strdup(saved_kbuild_include_opts); + + if (*kbuild_dir && *kbuild_include_opts) + return; + + zfree(kbuild_dir); + zfree(kbuild_include_opts); + /* + * Don't fall through: it may breaks saved_kbuild_dir and + * saved_kbuild_include_opts if detect them again when + * memory is low. + */ + return; + } + if (llvm_param.kbuild_dir && !llvm_param.kbuild_dir[0]) { pr_debug("[llvm.kbuild-dir] is set to \"\" deliberately.\n"); pr_debug("Skip kbuild options detection.\n"); - return; + goto errout; } err = detect_kbuild_dir(kbuild_dir); @@ -306,7 +326,7 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts) "Hint:\tSet correct kbuild directory using 'kbuild-dir' option in [llvm]\n" " \tsection of ~/.perfconfig or set it to \"\" to suppress kbuild\n" " \tdetection.\n\n"); - return; + goto errout; } pr_debug("Kernel build dir is set to %s\n", *kbuild_dir); @@ -325,14 +345,43 @@ get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts) free(*kbuild_dir); *kbuild_dir = NULL; - return; + goto errout; } pr_debug("include option is set to %s\n", *kbuild_include_opts); + + saved_kbuild_dir = strdup(*kbuild_dir); + saved_kbuild_include_opts = strdup(*kbuild_include_opts); + + if (!saved_kbuild_dir || !saved_kbuild_include_opts) { + zfree(&saved_kbuild_dir); + zfree(&saved_kbuild_include_opts); + } + return; +errout: + saved_kbuild_dir = ERR_PTR(-EINVAL); + saved_kbuild_include_opts = ERR_PTR(-EINVAL); } -static void -dump_obj(const char *path, void *obj_buf, size_t size) +int llvm__get_nr_cpus(void) +{ + static int nr_cpus_avail = 0; + char serr[STRERR_BUFSIZE]; + + if (nr_cpus_avail > 0) + return nr_cpus_avail; + + nr_cpus_avail = sysconf(_SC_NPROCESSORS_CONF); + if (nr_cpus_avail <= 0) { + pr_err( +"WARNING:\tunable to get available CPUs in this system: %s\n" +" \tUse 128 instead.\n", str_error_r(errno, serr, sizeof(serr))); + nr_cpus_avail = 128; + } + return nr_cpus_avail; +} + +void llvm__dump_obj(const char *path, void *obj_buf, size_t size) { char *obj_path = strdup(path); FILE *fp; @@ -406,15 +455,9 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf, * This is an optional work. Even it fail we can continue our * work. Needn't to check error return. */ - get_kbuild_opts(&kbuild_dir, &kbuild_include_opts); + llvm__get_kbuild_opts(&kbuild_dir, &kbuild_include_opts); - nr_cpus_avail = sysconf(_SC_NPROCESSORS_CONF); - if (nr_cpus_avail <= 0) { - pr_err( -"WARNING:\tunable to get available CPUs in this system: %s\n" -" \tUse 128 instead.\n", str_error_r(errno, serr, sizeof(serr))); - nr_cpus_avail = 128; - } + nr_cpus_avail = llvm__get_nr_cpus(); snprintf(nr_cpus_avail_str, sizeof(nr_cpus_avail_str), "%d", nr_cpus_avail); @@ -453,9 +496,6 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf, free(kbuild_dir); free(kbuild_include_opts); - if (llvm_param.dump_obj) - dump_obj(path, obj_buf, obj_buf_sz); - if (!p_obj_buf) free(obj_buf); else diff --git a/tools/perf/util/llvm-utils.h b/tools/perf/util/llvm-utils.h index 9f501cef06a1..c87a2a92a88f 100644 --- a/tools/perf/util/llvm-utils.h +++ b/tools/perf/util/llvm-utils.h @@ -50,4 +50,10 @@ int llvm__compile_bpf(const char *path, void **p_obj_buf, size_t *p_obj_buf_sz); /* This function is for test__llvm() use only */ int llvm__search_clang(void); + +/* Following functions are reused by builtin clang support */ +void llvm__get_kbuild_opts(char **kbuild_dir, char **kbuild_include_opts); +int llvm__get_nr_cpus(void); + +void llvm__dump_obj(const char *path, void *obj_buf, size_t size); #endif