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perf tools: Setup default dwarf post unwinder 

Factor NO_LIBDW_DWARF_UNWIND makefile variable and code that selects
default DWARf post unwinder based on detected features (libdw and
libunwind support)

If both are detected the libunwind is selected as default.  Simple
'make' will try to add:

  - libunwind unwinder if present
  - libdw unwinder if present
  - disable dwarf unwind if non of libunwind and libdw
    libraries are present

If one of the DWARF unwind libraries is detected, message is displayed
which one (libunwind/libdw) is compiled in.

Examples:
  - compile in libdw unwinder if present:

    $ make NO_LIBUNWIND=1

  - compile in libdw (with libdw installation directory) unwinder if present:

    $ make LIBDW_DIR=/opt/elfutils/ NO_LIBUNWIND=1
      BUILD:   Doing 'make -j4' parallel build

    Auto-detecting system features:
    ...                         dwarf: [ on  ]
    ...                         glibc: [ on  ]
    ...                          gtk2: [ on  ]
    ...                      libaudit: [ on  ]
    ...                        libbfd: [ on  ]
    ...                        libelf: [ on  ]
    ...                       libnuma: [ on  ]
    ...                       libperl: [ on  ]
    ...                     libpython: [ on  ]
    ...                      libslang: [ on  ]
    ...                     libunwind: [ on  ]
    ...            libdw-dwarf-unwind: [ on  ]
    ...     DWARF post unwind library: libdw

  - disable post dwarf unwind completely:

    $ make NO_LIBUNWIND=1 NO_LIBDW_DWARF_UNWIND=1
      BUILD:   Doing 'make -j4' parallel build

    Auto-detecting system features:
    ...                         dwarf: [ on  ]
    ...                         glibc: [ on  ]
    ...                          gtk2: [ on  ]
    ...                      libaudit: [ on  ]
    ...                        libbfd: [ on  ]
    ...                        libelf: [ on  ]
    ...                       libnuma: [ on  ]
    ...                       libperl: [ on  ]
    ...                     libpython: [ on  ]
    ...                      libslang: [ on  ]
    ...                     libunwind: [ on  ]
    ...            libdw-dwarf-unwind: [ on  ]
    ...     DWARF post unwind library: libunwind

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jean Pihet <jean.pihet@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1392825179-5228-6-git-send-email-jolsa@redhat.com
[ Add suggestion about setting LIBDW_DIR when not finding libdw ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2014-02-19 16:52:58 +01:00 committed by Arnaldo Carvalho de Melo
parent 5ea8415407
commit 0a4f2b6a3b
3 changed files with 66 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
tools/perf/Makefile.perf
View File

@ -61,9 +61,6 @@ include config/utilities.mak
# Define NO_LIBDW_DWARF_UNWIND if you do not want libdw support
# for dwarf backtrace post unwind.
# temporarily disabled
NO_LIBDW_DWARF_UNWIND := 1
ifeq ($(srctree),)
srctree := $(patsubst %/,%,$(dir $(shell pwd)))
srctree := $(patsubst %/,%,$(dir $(srctree)))
@ -412,7 +409,7 @@ endif
LIB_OBJS += $(OUTPUT)tests/code-reading.o
LIB_OBJS += $(OUTPUT)tests/sample-parsing.o
LIB_OBJS += $(OUTPUT)tests/parse-no-sample-id-all.o
ifndef NO_LIBUNWIND
ifndef NO_DWARF_UNWIND
ifeq ($(ARCH),x86)
LIB_OBJS += $(OUTPUT)tests/dwarf-unwind.o
endif

6
tools/perf/arch/x86/Makefile
View File

@ -4,12 +4,14 @@ LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/dwarf-regs.o
endif
ifndef NO_LIBUNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libunwind.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
endif
ifndef NO_LIBDW_DWARF_UNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/unwind-libdw.o
endif
ifndef NO_DWARF_UNWIND
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/regs_load.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/tests/dwarf-unwind.o
endif
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/header.o
LIB_OBJS += $(OUTPUT)arch/$(ARCH)/util/tsc.o
LIB_H += arch/$(ARCH)/util/tsc.h

78
tools/perf/config/Makefile
View File

@ -159,7 +159,8 @@ CORE_FEATURE_TESTS = \
libunwind \
on-exit \
stackprotector-all \
timerfd
timerfd \
libdw-dwarf-unwind
LIB_FEATURE_TESTS = \
dwarf \
@ -172,7 +173,8 @@ LIB_FEATURE_TESTS = \
libperl \
libpython \
libslang \
libunwind
libunwind \
libdw-dwarf-unwind
VF_FEATURE_TESTS = \
backtrace \
@ -280,6 +282,12 @@ else
msg := $(error No gnu/libc-version.h found, please install glibc-dev[el]/glibc-static);
endif
else
ifndef NO_LIBDW_DWARF_UNWIND
ifneq ($(feature-libdw-dwarf-unwind),1)
NO_LIBDW_DWARF_UNWIND := 1
msg := $(warning No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR);
endif
endif
ifneq ($(feature-dwarf), 1)
msg := $(warning No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev);
NO_DWARF := 1
@ -315,25 +323,51 @@ endif # NO_LIBELF
ifndef NO_LIBUNWIND
ifneq ($(feature-libunwind), 1)
msg := $(warning No libunwind found, disabling post unwind support. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
msg := $(warning No libunwind found. Please install libunwind-dev[el] >= 1.1 and/or set LIBUNWIND_DIR);
NO_LIBUNWIND := 1
endif
endif
dwarf-post-unwind := 1
dwarf-post-unwind-text := BUG
# setup DWARF post unwinder
ifdef NO_LIBUNWIND
ifdef NO_LIBDW_DWARF_UNWIND
msg := $(warning Disabling post unwind, no support found.);
dwarf-post-unwind := 0
else
ifeq ($(ARCH),arm)
$(call feature_check,libunwind-debug-frame)
ifneq ($(feature-libunwind-debug-frame), 1)
msg := $(warning No debug_frame support found in libunwind);
CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
endif
else
# non-ARM has no dwarf_find_debug_frame() function:
dwarf-post-unwind-text := libdw
endif
else
dwarf-post-unwind-text := libunwind
# Enable libunwind support by default.
ifndef NO_LIBDW_DWARF_UNWIND
NO_LIBDW_DWARF_UNWIND := 1
endif
endif
ifeq ($(dwarf-post-unwind),1)
CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT
else
NO_DWARF_UNWIND := 1
endif
ifndef NO_LIBUNWIND
ifeq ($(ARCH),arm)
$(call feature_check,libunwind-debug-frame)
ifneq ($(feature-libunwind-debug-frame), 1)
msg := $(warning No debug_frame support found in libunwind);
CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
endif
CFLAGS += -DHAVE_DWARF_UNWIND_SUPPORT -DHAVE_LIBUNWIND_SUPPORT
EXTLIBS += $(LIBUNWIND_LIBS)
CFLAGS += $(LIBUNWIND_CFLAGS)
LDFLAGS += $(LIBUNWIND_LDFLAGS)
endif # ifneq ($(feature-libunwind), 1)
else
# non-ARM has no dwarf_find_debug_frame() function:
CFLAGS += -DNO_LIBUNWIND_DEBUG_FRAME
endif
CFLAGS += -DHAVE_LIBUNWIND_SUPPORT
EXTLIBS += $(LIBUNWIND_LIBS)
CFLAGS += $(LIBUNWIND_CFLAGS)
LDFLAGS += $(LIBUNWIND_LDFLAGS)
endif
ifndef NO_LIBAUDIT
@ -620,6 +654,10 @@ endef
PERF_FEATURES := $(foreach feat,$(LIB_FEATURE_TESTS),feature-$(feat)($(feature-$(feat))))
PERF_FEATURES_FILE := $(shell touch $(OUTPUT)PERF-FEATURES; cat $(OUTPUT)PERF-FEATURES)
ifeq ($(dwarf-post-unwind),1)
PERF_FEATURES += dwarf-post-unwind($(dwarf-post-unwind-text))
endif
# The $(display_lib) controls the default detection message
# output. It's set if:
# - detected features differes from stored features from
@ -650,6 +688,10 @@ ifeq ($(display_lib),1)
$(info )
$(info Auto-detecting system features:)
$(foreach feat,$(LIB_FEATURE_TESTS),$(call feature_print_status,$(feat),))
ifeq ($(dwarf-post-unwind),1)
$(call feature_print_text,"DWARF post unwind library", $(dwarf-post-unwind-text))
endif
endif
ifeq ($(display_vf),1)
@ -659,6 +701,8 @@ ifeq ($(display_vf),1)
$(call feature_print_var,bindir)
$(call feature_print_var,libdir)
$(call feature_print_var,sysconfdir)
$(call feature_print_var,LIBUNWIND_DIR)
$(call feature_print_var,LIBDW_DIR)
endif
ifeq ($(display_lib),1)