[PATCH 00/37] perf/core improvements and fixes
From: Arnaldo Carvalho de Melo
Date: Thu Oct 25 2018 - 07:10:48 EST
Hi Ingo,
Please consider pulling,
- Arnaldo
Test results at the end of this message, as usual.
The following changes since commit ce6c9da1113ad681bff27a3e376d2017f7f8a59c:
Merge remote-tracking branch 'tip/perf/urgent' into perf/core (2018-10-18 11:13:01 -0300)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-core-for-mingo-4.20-20181025
for you to fetch changes up to fe57120e18a1f9124ca758c89cc54f91333d1847:
perf script: Support total cycles count (2018-10-24 15:29:56 -0300)
----------------------------------------------------------------
perf/core improvements and fixes:
- Introduce 'perf trace --max-events' for stopping 'perf trace' when
that many syscalls (enter+exit), tracepoints or other events such as
page faults take place.
Support that as well on a per-event basis, e.g.:
perf trace -e sched:*switch/nr=2/,block:*_plug/nr=4/,block:*_unplug/nr=1/,net:*dev_queue/nr=3,max-stack=16/
Will stop when 2 context switches, 4 block plugs, 1 block unplug and
3 net_dev_queue tracepoints take place. (Arnaldo Carvalho de Melo)
- Poll for monitored tasks being alive in 'perf stat -p/-t', exiting when
those tasks all terminate (Jiri Olsa)
- Encode -k clockid frequency into perf.data to enable timestamps derived
metrics conversion into wall clock time on reporting stage. (Alexey Budankov)
- Improve Intel PT call graph from SQL database and GUI python scripts,
including adopting the Qt MDI interface to allow for multiple subwindows
for all the tables, helping in better visualizing the data in the SQL
tables, also uses, when available, the Intel XED disassembler libraries
to present the Intel PT data as x86 asm mnemonics. This last feature
is not currently working in some cases, fix is being discussed (Adrian Hunter)
- Implement a ftrace function_graph view in 'perf script' when processing
hardware trace data such as Intel PT (Andi Kleen)
- Better integration with the Intel XED disassembler, when available, in
'perf script' (Andi Kleen)
- Some 'perf trace' drop refcount fixes (Arnaldo Carvalho de Melo)
- Add Sparc support to 'perf annotate', jitdump (David Miller)
- Fix PLT symbols entry/header sizes properly on Sparc (David Miller)
- Fix generation of system call table failure with /tmp mounted with 'noexec'
in arm64 (Hongxu Jia)
- Allow extended console debug output in 'perf script' (Milian Wolff)
- Flush output stream after events in 'perf script' verbose mode (Milian Wolff)
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
----------------------------------------------------------------
Adrian Hunter (17):
perf scripts python: call-graph-from-sql.py: Use SPDX license identifier
perf scripts python: call-graph-from-sql.py: Provide better default column sizes
perf scripts python: call-graph-from-sql.py: Set a minimum window size
perf scripts python: call-graph-from-sql.py: Change icon
perf scripts python: call-graph-from-sql.py: Make a "Main" function
perf scripts python: call-graph-from-sql.py: Separate the database details into a class
perf scripts python: call-graph-from-sql.py: Add a class for global data
perf scripts python: call-graph-from-sql.py: Remove use of setObjectName()
perf scripts python: call-graph-from-sql.py: Factor out CallGraphModel from TreeModel
perf scripts python: call-graph-from-sql.py: Add data helper functions
perf scripts python: call-graph-from-sql.py: Refactor TreeItem class
perf scripts python: call-graph-from-sql.py: Rename to exported-sql-viewer.py
perf scripts python: exported-sql-viewer.py: Add support for multiple sub-windows
perf scripts python: exported-sql-viewer.py: Add ability to find symbols in the call-graph
perf scripts python: exported-sql-viewer.py: Add ability to shrink / enlarge font
perf scripts python: exported-sql-viewer.py: Add ability to display all the database tables
perf scripts python: exported-sql-viewer.py: Add All branches report
Alexey Budankov (1):
perf record: Encode -k clockid frequency into Perf trace
Andi Kleen (5):
perf script: Add --insn-trace for instruction decoding
perf script: Make itrace script default to all calls
tools script: Add --call-trace and --call-ret-trace
perf script: Implement --graph-function
perf script: Support total cycles count
Arnaldo Carvalho de Melo (7):
tools lib subcmd: Introduce OPTION_ULONG
perf trace: Introduce --max-events
perf evsel: Introduce per event max_events property
perf evsel: Mark a evsel as disabled when asking the kernel do disable it
perf trace: Drop addr_location refcounts
perf trace: Drop thread refcount in trace__event_handler()
perf trace: Introduce per-event maximum number of events property
David Miller (3):
perf annotate: Add Sparc support
perf jitdump: Add Sparc support.
perf symbols: Set PLT entry/header sizes properly on Sparc
Hongxu Jia (1):
perf arm64: Fix generate system call table failed with /tmp mounted with noexec
Jiri Olsa (1):
perf stat: Poll for monitored tasks being alive
Milian Wolff (2):
perf script: Allow extended console debug output
perf script: Flush output stream after events in verbose mode
tools/lib/subcmd/parse-options.c | 19 +
tools/lib/subcmd/parse-options.h | 2 +
tools/perf/Documentation/build-xed.txt | 19 +
tools/perf/Documentation/intel-pt.txt | 2 +-
tools/perf/Documentation/itrace.txt | 7 +-
tools/perf/Documentation/perf-script.txt | 18 +
tools/perf/Documentation/perf-trace.txt | 67 +
tools/perf/arch/arm64/entry/syscalls/mksyscalltbl | 2 +-
tools/perf/arch/sparc/Makefile | 2 +
tools/perf/arch/sparc/annotate/instructions.c | 169 ++
tools/perf/builtin-record.c | 24 +-
tools/perf/builtin-script.c | 166 +-
tools/perf/builtin-stat.c | 24 +
tools/perf/builtin-trace.c | 50 +-
tools/perf/perf.h | 1 +
tools/perf/scripts/python/call-graph-from-sql.py | 339 ----
tools/perf/scripts/python/export-to-postgresql.py | 2 +-
tools/perf/scripts/python/export-to-sqlite.py | 2 +-
tools/perf/scripts/python/exported-sql-viewer.py | 2128 +++++++++++++++++++++
tools/perf/util/annotate.c | 8 +
tools/perf/util/auxtrace.c | 17 +-
tools/perf/util/auxtrace.h | 5 +-
tools/perf/util/cs-etm.c | 3 +-
tools/perf/util/env.h | 1 +
tools/perf/util/evlist.c | 2 +-
tools/perf/util/evsel.c | 27 +-
tools/perf/util/evsel.h | 5 +
tools/perf/util/genelf.h | 6 +
tools/perf/util/header.c | 23 +
tools/perf/util/header.h | 1 +
tools/perf/util/intel-bts.c | 3 +-
tools/perf/util/intel-pt.c | 3 +-
tools/perf/util/parse-events.c | 8 +
tools/perf/util/parse-events.h | 1 +
tools/perf/util/parse-events.l | 1 +
tools/perf/util/symbol-elf.c | 12 +-
tools/perf/util/symbol.h | 3 +-
tools/perf/util/thread.h | 2 +
38 files changed, 2778 insertions(+), 396 deletions(-)
create mode 100644 tools/perf/Documentation/build-xed.txt
create mode 100644 tools/perf/arch/sparc/annotate/instructions.c
delete mode 100644 tools/perf/scripts/python/call-graph-from-sql.py
create mode 100755 tools/perf/scripts/python/exported-sql-viewer.py
Test results:
The first ones are container (docker) based builds of tools/perf with
and without libelf support. Where clang is available, it is also used
to build perf with/without libelf, and building with LIBCLANGLLVM=1
(built-in clang) with gcc and clang when clang and its devel libraries
are installed.
The objtool and samples/bpf/ builds are disabled now that I'm switching from
using the sources in a local volume to fetching them from a http server to
build it inside the container, to make it easier to build in a container cluster.
Those will come back later.
Several are cross builds, the ones with -x-ARCH and the android one, and those
may not have all the features built, due to lack of multi-arch devel packages,
available and being used so far on just a few, like
debian:experimental-x-{arm64,mipsel}.
The 'perf test' one will perform a variety of tests exercising
tools/perf/util/, tools/lib/{bpf,traceevent,etc}, as well as run perf commands
with a variety of command line event specifications to then intercept the
sys_perf_event syscall to check that the perf_event_attr fields are set up as
expected, among a variety of other unit tests.
Then there is the 'make -C tools/perf build-test' ones, that build tools/perf/
with a variety of feature sets, exercising the build with an incomplete set of
features as well as with a complete one. It is planned to have it run on each
of the containers mentioned above, using some container orchestration
infrastructure. Get in contact if interested in helping having this in place.
# dm
1 alpine:3.4 : Ok gcc (Alpine 5.3.0) 5.3.0
2 alpine:3.5 : Ok gcc (Alpine 6.2.1) 6.2.1 20160822
3 alpine:3.6 : Ok gcc (Alpine 6.3.0) 6.3.0
4 alpine:3.7 : Ok gcc (Alpine 6.4.0) 6.4.0
5 alpine:3.8 : Ok gcc (Alpine 6.4.0) 6.4.0
6 alpine:edge : Ok gcc (Alpine 6.4.0) 6.4.0
6 alpine:edge : Ok gcc (Alpine 6.4.0) 6.4.0
7 amazonlinux:1 : Ok gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
8 amazonlinux:2 : Ok gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
9 android-ndk:r12b-arm : Ok arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
10 android-ndk:r15c-arm : Ok arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
11 centos:5 : Ok gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-55)
12 centos:6 : Ok gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)
13 centos:7 : Ok gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
14 debian:7 : Ok gcc (Debian 4.7.2-5) 4.7.2
15 debian:8 : Ok gcc (Debian 4.9.2-10+deb8u1) 4.9.2
16 debian:9 : Ok gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
17 debian:experimental : Ok gcc (Debian 8.2.0-7) 8.2.0
18 debian:experimental-x-arm64 : Ok aarch64-linux-gnu-gcc (Debian 8.2.0-7) 8.2.0
19 debian:experimental-x-mips : Ok mips-linux-gnu-gcc (Debian 8.2.0-7) 8.2.0
20 debian:experimental-x-mips64 : Ok mips64-linux-gnuabi64-gcc (Debian 8.1.0-12) 8.1.0
21 debian:experimental-x-mipsel : Ok mipsel-linux-gnu-gcc (Debian 8.2.0-7) 8.2.0
22 fedora:20 : Ok gcc (GCC) 4.8.3 20140911 (Red Hat 4.8.3-7)
23 fedora:21 : Ok gcc (GCC) 4.9.2 20150212 (Red Hat 4.9.2-6)
24 fedora:22 : Ok gcc (GCC) 5.3.1 20160406 (Red Hat 5.3.1-6)
25 fedora:23 : Ok gcc (GCC) 5.3.1 20160406 (Red Hat 5.3.1-6)
26 fedora:24 : Ok gcc (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1)
27 fedora:24-x-ARC-uClibc : Ok arc-linux-gcc (ARCompact ISA Linux uClibc toolchain 2017.09-rc2) 7.1.1 20170710
28 fedora:25 : Ok gcc (GCC) 6.4.1 20170727 (Red Hat 6.4.1-1)
29 fedora:26 : Ok gcc (GCC) 7.3.1 20180130 (Red Hat 7.3.1-2)
30 fedora:27 : Ok gcc (GCC) 7.3.1 20180712 (Red Hat 7.3.1-6)
31 fedora:28 : Ok gcc (GCC) 8.1.1 20180712 (Red Hat 8.1.1-5)
32 fedora:rawhide : Ok gcc (GCC) 8.2.1 20180905 (Red Hat 8.2.1-3)
33 gentoo-stage3-amd64:latest : Ok gcc (Gentoo 7.3.0-r3 p1.4) 7.3.0
34 mageia:5 : Ok gcc (GCC) 4.9.2
35 mageia:6 : Ok gcc (Mageia 5.5.0-1.mga6) 5.5.0
36 opensuse:13.2 : Ok gcc (SUSE Linux) 4.8.3 20140627 [gcc-4_8-branch revision 212064]
37 opensuse:42.1 : Ok gcc (SUSE Linux) 4.8.5
38 opensuse:42.2 : Ok gcc (SUSE Linux) 4.8.5
39 opensuse:42.3 : Ok gcc (SUSE Linux) 4.8.5
40 opensuse:tumbleweed : Ok gcc (SUSE Linux) 7.3.1 20180323 [gcc-7-branch revision 258812]
41 oraclelinux:6 : Ok gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23.0.1)
42 oraclelinux:7 : Ok gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28.0.1)
43 ubuntu:12.04.5 : Ok gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
44 ubuntu:14.04.4 : Ok gcc (Ubuntu 4.8.4-2ubuntu1~14.04.3) 4.8.4
45 ubuntu:14.04.4-x-linaro-arm64 : Ok aarch64-linux-gnu-gcc (Linaro GCC 5.5-2017.10) 5.5.0
46 ubuntu:16.04 : Ok gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609
47 ubuntu:16.04-x-arm : Ok arm-linux-gnueabihf-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
48 ubuntu:16.04-x-arm64 : Ok aarch64-linux-gnu-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
49 ubuntu:16.04-x-powerpc : Ok powerpc-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
50 ubuntu:16.04-x-powerpc64 : Ok powerpc64-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
51 ubuntu:16.04-x-powerpc64el : Ok powerpc64le-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
52 ubuntu:16.04-x-s390 : Ok s390x-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
53 ubuntu:16.10 : Ok gcc (Ubuntu 6.2.0-5ubuntu12) 6.2.0 20161005
54 ubuntu:17.10 : Ok gcc (Ubuntu 7.2.0-8ubuntu3.2) 7.2.0
55 ubuntu:18.04 : Ok gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
56 ubuntu:18.04-x-arm : Ok arm-linux-gnueabihf-gcc (Ubuntu/Linaro 7.3.0-27ubuntu1~18.04) 7.3.0
57 ubuntu:18.04-x-arm64 : Ok aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.3.0-27ubuntu1~18.04) 7.3.0
58 ubuntu:18.04-x-m68k : Ok m68k-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
59 ubuntu:18.04-x-powerpc : Ok powerpc-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
60 ubuntu:18.04-x-powerpc64 : Ok powerpc64-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
61 ubuntu:18.04-x-powerpc64el : Ok powerpc64le-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
62 ubuntu:18.04-x-riscv64 : Ok riscv64-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
63 ubuntu:18.04-x-s390 : Ok s390x-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
64 ubuntu:18.04-x-sh4 : Ok sh4-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
65 ubuntu:18.04-x-sparc64 : Ok sparc64-linux-gnu-gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
66 ubuntu:18.10 : Ok gcc (Ubuntu 8.2.0-7ubuntu1) 8.2.0
# uname -a
Linux jouet 4.19.0-rc4-00022-gad3273d5f1b9 #1 SMP Mon Sep 17 17:18:22 -03 2018 x86_64 x86_64 x86_64 GNU/Linux
# git log --oneline -1
fe57120e18a1 perf script: Support total cycles count
# perf version --build-options
perf version 4.19.rc8.gfe5712
dwarf: [ on ] # HAVE_DWARF_SUPPORT
dwarf_getlocations: [ on ] # HAVE_DWARF_GETLOCATIONS_SUPPORT
glibc: [ on ] # HAVE_GLIBC_SUPPORT
gtk2: [ on ] # HAVE_GTK2_SUPPORT
syscall_table: [ on ] # HAVE_SYSCALL_TABLE_SUPPORT
libbfd: [ on ] # HAVE_LIBBFD_SUPPORT
libelf: [ on ] # HAVE_LIBELF_SUPPORT
libnuma: [ on ] # HAVE_LIBNUMA_SUPPORT
numa_num_possible_cpus: [ on ] # HAVE_LIBNUMA_SUPPORT
libperl: [ on ] # HAVE_LIBPERL_SUPPORT
libpython: [ on ] # HAVE_LIBPYTHON_SUPPORT
libslang: [ on ] # HAVE_SLANG_SUPPORT
libcrypto: [ on ] # HAVE_LIBCRYPTO_SUPPORT
libunwind: [ on ] # HAVE_LIBUNWIND_SUPPORT
libdw-dwarf-unwind: [ on ] # HAVE_DWARF_SUPPORT
zlib: [ on ] # HAVE_ZLIB_SUPPORT
lzma: [ on ] # HAVE_LZMA_SUPPORT
get_cpuid: [ on ] # HAVE_AUXTRACE_SUPPORT
bpf: [ on ] # HAVE_LIBBPF_SUPPORT
# perf test
1: vmlinux symtab matches kallsyms : Ok
2: Detect openat syscall event : Ok
3: Detect openat syscall event on all cpus : Ok
4: Read samples using the mmap interface : Ok
5: Test data source output : Ok
6: Parse event definition strings : Ok
7: Simple expression parser : Ok
8: PERF_RECORD_* events & perf_sample fields : Ok
9: Parse perf pmu format : Ok
10: DSO data read : Ok
11: DSO data cache : Ok
12: DSO data reopen : Ok
13: Roundtrip evsel->name : Ok
14: Parse sched tracepoints fields : Ok
15: syscalls:sys_enter_openat event fields : Ok
16: Setup struct perf_event_attr : Ok
17: Match and link multiple hists : Ok
18: 'import perf' in python : Ok
19: Breakpoint overflow signal handler : Ok
20: Breakpoint overflow sampling : Ok
21: Breakpoint accounting : Ok
22: Watchpoint :
22.1: Read Only Watchpoint : Skip
22.2: Write Only Watchpoint : Ok
22.3: Read / Write Watchpoint : Ok
22.4: Modify Watchpoint : Ok
23: Number of exit events of a simple workload : Ok
24: Software clock events period values : Ok
25: Object code reading : Ok
26: Sample parsing : Ok
27: Use a dummy software event to keep tracking : Ok
28: Parse with no sample_id_all bit set : Ok
29: Filter hist entries : Ok
30: Lookup mmap thread : Ok
31: Share thread mg : Ok
32: Sort output of hist entries : Ok
33: Cumulate child hist entries : Ok
34: Track with sched_switch : Ok
35: Filter fds with revents mask in a fdarray : Ok
36: Add fd to a fdarray, making it autogrow : Ok
37: kmod_path__parse : Ok
38: Thread map : Ok
39: LLVM search and compile :
39.1: Basic BPF llvm compile : Ok
39.2: kbuild searching : Ok
39.3: Compile source for BPF prologue generation : Ok
39.4: Compile source for BPF relocation : Ok
40: Session topology : Ok
41: BPF filter :
41.1: Basic BPF filtering : Ok
41.2: BPF pinning : Ok
41.3: BPF prologue generation : Ok
41.4: BPF relocation checker : Ok
42: Synthesize thread map : Ok
43: Remove thread map : Ok
44: Synthesize cpu map : Ok
45: Synthesize stat config : Ok
46: Synthesize stat : Ok
47: Synthesize stat round : Ok
48: Synthesize attr update : Ok
49: Event times : Ok
50: Read backward ring buffer : Ok
51: Print cpu map : Ok
52: Probe SDT events : Ok
53: is_printable_array : Ok
54: Print bitmap : Ok
55: perf hooks : Ok
56: builtin clang support : Skip (not compiled in)
57: unit_number__scnprintf : Ok
58: mem2node : Ok
59: x86 rdpmc : Ok
60: Convert perf time to TSC : Ok
61: DWARF unwind : Ok
62: x86 instruction decoder - new instructions : Ok
63: x86 bp modify : Ok
64: Use vfs_getname probe to get syscall args filenames : Ok
65: Check open filename arg using perf trace + vfs_getname: Ok
66: probe libc's inet_pton & backtrace it with ping : Ok
67: Add vfs_getname probe to get syscall args filenames : Ok
$ make -C tools/perf build-test
make: Entering directory '/home/acme/git/perf/tools/perf'
make_no_auxtrace_O: make NO_AUXTRACE=1
make_no_libbpf_O: make NO_LIBBPF=1
make_with_clangllvm_O: make LIBCLANGLLVM=1
make_no_libaudit_O: make NO_LIBAUDIT=1
make_no_backtrace_O: make NO_BACKTRACE=1
make_no_gtk2_O: make NO_GTK2=1
make_tags_O: make tags
make_install_bin_O: make install-bin
make_util_map_o_O: make util/map.o
make_static_O: make LDFLAGS=-static
make_no_libbionic_O: make NO_LIBBIONIC=1
make_debug_O: make DEBUG=1
make_install_prefix_slash_O: make install prefix=/tmp/krava/
make_util_pmu_bison_o_O: make util/pmu-bison.o
make_help_O: make help
make_clean_all_O: make clean all
make_no_libpython_O: make NO_LIBPYTHON=1
make_no_ui_O: make NO_NEWT=1 NO_SLANG=1 NO_GTK2=1
make_doc_O: make doc
make_no_newt_O: make NO_NEWT=1
make_minimal_O: make NO_LIBPERL=1 NO_LIBPYTHON=1 NO_NEWT=1 NO_GTK2=1 NO_DEMANGLE=1 NO_LIBELF=1 NO_LIBUNWIND=1 NO_BACKTRACE=1 NO_LIBNUMA=1 NO_LIBAUDIT=1 NO_LIBBIONIC=1 NO_LIBDW_DWARF_UNWIND=1 NO_AUXTRACE=1 NO_LIBBPF=1 NO_LIBCRYPTO=1 NO_SDT=1 NO_JVMTI=1
make_no_libunwind_O: make NO_LIBUNWIND=1
make_no_scripts_O: make NO_LIBPYTHON=1 NO_LIBPERL=1
make_install_O: make install
make_no_demangle_O: make NO_DEMANGLE=1
make_install_prefix_O: make install prefix=/tmp/krava
make_pure_O: make
make_no_libelf_O: make NO_LIBELF=1
make_with_babeltrace_O: make LIBBABELTRACE=1
make_no_libperl_O: make NO_LIBPERL=1
make_no_slang_O: make NO_SLANG=1
make_no_libnuma_O: make NO_LIBNUMA=1
make_no_libdw_dwarf_unwind_O: make NO_LIBDW_DWARF_UNWIND=1
make_perf_o_O: make perf.o
OK
make: Leaving directory '/home/acme/git/perf/tools/perf'
$