From 393be2e3747ea3ef0d2e724115a5f42b2fa50dbd Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 6 Aug 2012 13:41:21 +0900 Subject: [PATCH] perf symbols: Support minimal build without libelf Now we have isolated all ELF-specific stuff, it's possible to build without libelf. The output binary can do most of jobs but lacks (user level) symbol information - kernel symbols are still accessable thanks to the kallsyms. To build perf without libelf (elfutils), give NO_LIBELF=1 to make. For now, only 'perf probe' command is removed since it depends on libelf/libdw heavily. Signed-off-by: Namhyung Kim Cc: Ingo Molnar Cc: Jiri Olsa Cc: Paul Mackerras Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/1344228082-15569-4-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Makefile | 57 ++++++++++++++++++++++++++++--------- tools/perf/builtin-inject.c | 5 +++- tools/perf/command-list.txt | 2 +- tools/perf/perf.c | 2 ++ tools/perf/util/generate-cmdlist.sh | 15 ++++++++++ tools/perf/util/map.c | 3 +- tools/perf/util/symbol-minimal.c | 39 +++++++++++++++++++++++++ 7 files changed, 106 insertions(+), 17 deletions(-) create mode 100644 tools/perf/util/symbol-minimal.c diff --git a/tools/perf/Makefile b/tools/perf/Makefile index f790e3b..de6aa8c 100644 --- a/tools/perf/Makefile +++ b/tools/perf/Makefile @@ -37,7 +37,12 @@ include config/utilities.mak # # Define NO_NEWT if you do not want TUI support. # +# Define NO_GTK2 if you do not want GTK+ GUI support. +# # Define NO_DEMANGLE if you do not want C++ symbol demangling. +# +# Define NO_LIBELF if you do not want libelf dependency (e.g. cross-builds) +# $(OUTPUT)PERF-VERSION-FILE: .FORCE-PERF-VERSION-FILE @$(SHELL_PATH) util/PERF-VERSION-GEN $(OUTPUT) @@ -450,34 +455,57 @@ PYRF_OBJS += $(OUTPUT)util/xyarray.o -include config.mak.autogen -include config.mak -ifndef NO_DWARF -FLAGS_DWARF=$(ALL_CFLAGS) -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) -ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF)),y) - msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev); +ifdef NO_LIBELF NO_DWARF := 1 -endif # Dwarf support -endif # NO_DWARF - --include arch/$(ARCH)/Makefile - -ifneq ($(OUTPUT),) - BASIC_CFLAGS += -I$(OUTPUT) -endif - + NO_DEMANGLE := 1 +else FLAGS_LIBELF=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) ifneq ($(call try-cc,$(SOURCE_LIBELF),$(FLAGS_LIBELF)),y) FLAGS_GLIBC=$(ALL_CFLAGS) $(ALL_LDFLAGS) ifneq ($(call try-cc,$(SOURCE_GLIBC),$(FLAGS_GLIBC)),y) msg := $(error No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static); else - msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel); + NO_LIBELF := 1 + NO_DWARF := 1 + NO_DEMANGLE := 1 endif endif +endif # NO_LIBELF + +-include arch/$(ARCH)/Makefile + +ifneq ($(OUTPUT),) + BASIC_CFLAGS += -I$(OUTPUT) +endif + +ifdef NO_LIBELF +BASIC_CFLAGS += -DNO_LIBELF_SUPPORT + +EXTLIBS := $(filter-out -lelf,$(EXTLIBS)) + +# Remove ELF/DWARF dependent codes +LIB_OBJS := $(filter-out $(OUTPUT)util/symbol-elf.o,$(LIB_OBJS)) +LIB_OBJS := $(filter-out $(OUTPUT)util/dwarf-aux.o,$(LIB_OBJS)) +LIB_OBJS := $(filter-out $(OUTPUT)util/probe-event.o,$(LIB_OBJS)) +LIB_OBJS := $(filter-out $(OUTPUT)util/probe-finder.o,$(LIB_OBJS)) + +BUILTIN_OBJS := $(filter-out $(OUTPUT)builtin-probe.o,$(BUILTIN_OBJS)) + +# Use minimal symbol handling +LIB_OBJS += $(OUTPUT)util/symbol-minimal.o + +else # NO_LIBELF ifneq ($(call try-cc,$(SOURCE_ELF_MMAP),$(FLAGS_COMMON)),y) BASIC_CFLAGS += -DLIBELF_NO_MMAP endif +FLAGS_DWARF=$(ALL_CFLAGS) -ldw -lelf $(ALL_LDFLAGS) $(EXTLIBS) +ifneq ($(call try-cc,$(SOURCE_DWARF),$(FLAGS_DWARF)),y) + msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev); + NO_DWARF := 1 +endif # Dwarf support + ifndef NO_DWARF ifeq ($(origin PERF_HAVE_DWARF_REGS), undefined) msg := $(warning DWARF register mappings have not been defined for architecture $(ARCH), DWARF support disabled); @@ -488,6 +516,7 @@ else LIB_OBJS += $(OUTPUT)util/dwarf-aux.o endif # PERF_HAVE_DWARF_REGS endif # NO_DWARF +endif # NO_LIBELF ifdef NO_NEWT BASIC_CFLAGS += -DNO_NEWT_SUPPORT diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c index 3beab48..64d8ba2 100644 --- a/tools/perf/builtin-inject.c +++ b/tools/perf/builtin-inject.c @@ -191,10 +191,13 @@ static int perf_event__inject_buildid(struct perf_tool *tool, * If this fails, too bad, let the other side * account this as unresolved. */ - } else + } else { +#ifndef NO_LIBELF_SUPPORT pr_warning("no symbols found in %s, maybe " "install a debug package?\n", al.map->dso->long_name); +#endif + } } } diff --git a/tools/perf/command-list.txt b/tools/perf/command-list.txt index d695fe4..0303ec6 100644 --- a/tools/perf/command-list.txt +++ b/tools/perf/command-list.txt @@ -18,7 +18,7 @@ perf-stat mainporcelain common perf-timechart mainporcelain common perf-top mainporcelain common perf-script mainporcelain common -perf-probe mainporcelain common +perf-probe mainporcelain full perf-kmem mainporcelain common perf-lock mainporcelain common perf-kvm mainporcelain common diff --git a/tools/perf/perf.c b/tools/perf/perf.c index db37ee3..e7840e5 100644 --- a/tools/perf/perf.c +++ b/tools/perf/perf.c @@ -47,7 +47,9 @@ static struct cmd_struct commands[] = { { "version", cmd_version, 0 }, { "script", cmd_script, 0 }, { "sched", cmd_sched, 0 }, +#ifndef NO_LIBELF_SUPPORT { "probe", cmd_probe, 0 }, +#endif { "kmem", cmd_kmem, 0 }, { "lock", cmd_lock, 0 }, { "kvm", cmd_kvm, 0 }, diff --git a/tools/perf/util/generate-cmdlist.sh b/tools/perf/util/generate-cmdlist.sh index f06f6fd..389590c 100755 --- a/tools/perf/util/generate-cmdlist.sh +++ b/tools/perf/util/generate-cmdlist.sh @@ -21,4 +21,19 @@ do p }' "Documentation/perf-$cmd.txt" done + +echo "#ifndef NO_LIBELF_SUPPORT" +sed -n -e 's/^perf-\([^ ]*\)[ ].* full.*/\1/p' command-list.txt | +sort | +while read cmd +do + sed -n ' + /^NAME/,/perf-'"$cmd"'/H + ${ + x + s/.*perf-'"$cmd"' - \(.*\)/ {"'"$cmd"'", "\1"},/ + p + }' "Documentation/perf-$cmd.txt" +done +echo "#endif /* NO_LIBELF_SUPPORT */" echo "};" diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c index 115654c..287cb34 100644 --- a/tools/perf/util/map.c +++ b/tools/perf/util/map.c @@ -156,6 +156,7 @@ int map__load(struct map *self, symbol_filter_t filter) pr_warning(", continuing without symbols\n"); return -1; } else if (nr == 0) { +#ifndef NO_LIBELF_SUPPORT const size_t len = strlen(name); const size_t real_len = len - sizeof(DSO__DELETED); @@ -168,7 +169,7 @@ int map__load(struct map *self, symbol_filter_t filter) pr_warning("no symbols found in %s, maybe install " "a debug package?\n", name); } - +#endif return -1; } /* diff --git a/tools/perf/util/symbol-minimal.c b/tools/perf/util/symbol-minimal.c new file mode 100644 index 0000000..416ecf3 --- /dev/null +++ b/tools/perf/util/symbol-minimal.c @@ -0,0 +1,39 @@ +#include "symbol.h" + + +int filename__read_build_id(const char *filename __used, void *bf __used, + size_t size __used) +{ + return -1; +} + +int sysfs__read_build_id(const char *filename __used, void *build_id __used, + size_t size __used) +{ + return -1; +} + +int filename__read_debuglink(const char *filename __used, + char *debuglink __used, size_t size __used) +{ + return -1; +} + +int dso__synthesize_plt_symbols(struct dso *dso __used, char *name __used, + struct map *map __used, + symbol_filter_t filter __used) +{ + return 0; +} + +int dso__load_sym(struct dso *dso __used, struct map *map __used, + const char *name __used, int fd __used, + symbol_filter_t filter __used, int kmodule __used, + int want_symtab __used) +{ + return 0; +} + +void symbol__elf_init(void) +{ +} -- 2.7.4