[GIT PULL] perf/urgent fixes for 5.2

[Arnaldo Carvalho de Melo]

Hi Ingo,

	Please consider pulling, that is a trimmed down set from
yesterday's pull req, with just fixes.

	The other stuff, mostly acting on the warnings for the UAPI
changes are being packaged into a perf/core pull request I'll send for
5.3.

	I had it mostly done earlier, but then I noticed the fix for
the syscall numbers, and backtracked to avoid sending yet another pull
req, got too late in the -rc game, so 5.3 they go.

	I'm not reposting them, the only change was adding an Acked-by
for one of the UAPI syncs, the drm.h one.

        I did all the tests again, find them below, after the new signed
tag.

Best regards,

- Arnaldo

Test results at the end of this message, as usual.

The following changes since commit 5bdd9ad875b6edf213f54ec3986ed9e8640c5cf9:

  Merge tag 'kbuild-fixes-v5.2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild (2019-05-20 17:22:17 -0700)

are available in the Git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git tags/perf-urgent-for-mingo-5.2-20190528

for you to fetch changes up to a7350998a25ac10cdca5b33dee1d343a74debbfe:

  tools headers UAPI: Sync kvm.h headers with the kernel sources (2019-05-28 09:52:23 -0300)

----------------------------------------------------------------
perf/urgent fixes:

BPF:

  Jiri Olsa:

  - Fixup determination of end of kernel map, to avoid having BPF programs,
    that are after the kernel headers and just before module texts mixed up in
    the kernel map.

tools UAPI header copies:

  Arnaldo Carvalho de Melo:

  - Update copy of files related to new fspick, fsmount, fsconfig, fsopen,
    move_mount and open_tree syscalls.

  - Sync cpufeatures.h, sched.h, fs.h, drm.h, i915_drm.h and kvm.h headers.

Namespaces:

  Namhyung Kim:

  - Add missing byte swap ops for namespace events when processing records from
    perf.data files that could have been recorded in a arch with a different
    endianness.

  - Fix access to the thread namespaces list by using the namespaces_lock.

perf data:

  Shawn Landden:

  - Fix 'strncat may truncate' build failure with recent gcc.

s/390

  Thomas Richter:

  - Fix s390 missing module symbol and warning for non-root users in 'perf record'.

arm64:

  Vitaly Chikunov:

  - Fix mksyscalltbl when system kernel headers are ahead of the kernel.

Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>

----------------------------------------------------------------
Arnaldo Carvalho de Melo (8):
      tools include UAPI: Update copy of files related to new fspick, fsmount, fsconfig, fsopen, move_mount and open_tree syscalls
      tools arch x86: Sync asm/cpufeatures.h with the with the kernel
      tools headers UAPI: Sync linux/sched.h with the kernel
      tools headers UAPI: Sync linux/fs.h with the kernel
      tools headers UAPI: Sync drm/i915_drm.h with the kernel
      tools headers UAPI: Sync drm/drm.h with the kernel
      perf test vmlinux-kallsyms: Ignore aliases to _etext when searching on kallsyms
      tools headers UAPI: Sync kvm.h headers with the kernel sources

Jiri Olsa (1):
      perf machine: Read also the end of the kernel

Namhyung Kim (2):
      perf namespace: Protect reading thread's namespace
      perf session: Add missing swap ops for namespace events

Shawn Landden (1):
      perf data: Fix 'strncat may truncate' build failure with recent gcc

Thomas Richter (1):
      perf record: Fix s390 missing module symbol and warning for non-root users

Vitaly Chikunov (1):
      perf arm64: Fix mksyscalltbl when system kernel headers are ahead of the kernel

 tools/arch/arm64/include/uapi/asm/kvm.h           |  43 ++++
 tools/arch/powerpc/include/uapi/asm/kvm.h         |  46 ++++
 tools/arch/s390/include/uapi/asm/kvm.h            |   4 +-
 tools/arch/x86/include/asm/cpufeatures.h          |   3 +
 tools/include/uapi/asm-generic/unistd.h           |  14 +-
 tools/include/uapi/drm/drm.h                      |  37 ++++
 tools/include/uapi/drm/i915_drm.h                 | 254 +++++++++++++++-------
 tools/include/uapi/linux/fcntl.h                  |   2 +
 tools/include/uapi/linux/fs.h                     |   3 +
 tools/include/uapi/linux/kvm.h                    |  15 +-
 tools/include/uapi/linux/mount.h                  |  62 ++++++
 tools/include/uapi/linux/sched.h                  |   1 +
 tools/perf/arch/arm64/entry/syscalls/mksyscalltbl |   2 +-
 tools/perf/arch/s390/util/machine.c               |   9 +-
 tools/perf/arch/x86/entry/syscalls/syscall_64.tbl |   6 +
 tools/perf/tests/vmlinux-kallsyms.c               |   9 +-
 tools/perf/util/data-convert-bt.c                 |   2 +-
 tools/perf/util/machine.c                         |  27 ++-
 tools/perf/util/session.c                         |  21 ++
 tools/perf/util/thread.c                          |  15 +-
 20 files changed, 481 insertions(+), 94 deletions(-)

Test results:

The first ones are container 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.

  $ export PERF_TARBALL=http://192.168.124.1/perf/perf-5.2.0-rc1.tar.xz
  $ 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:3.9                    : Ok   gcc (Alpine 8.3.0) 8.3.0
   7 alpine:edge                   : Ok   gcc (Alpine 8.3.0) 8.3.0
   8 amazonlinux:1                 : Ok   gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-28)
   9 amazonlinux:2                 : Ok   gcc (GCC) 7.3.1 20180303 (Red Hat 7.3.1-5)
  10 android-ndk:r12b-arm          : Ok   arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
  11 android-ndk:r15c-arm          : Ok   arm-linux-androideabi-gcc (GCC) 4.9.x 20150123 (prerelease)
  12 centos:5                      : Ok   gcc (GCC) 4.1.2 20080704 (Red Hat 4.1.2-55)
  13 centos:6                      : Ok   gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)
  14 centos:7                      : Ok   gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36)
  15 clearlinux:latest             : Ok   gcc (Clear Linux OS for Intel Architecture) 9.0.1 20190501 (prerelease) gcc-8-branch@270761
  16 debian:8                      : Ok   gcc (Debian 4.9.2-10+deb8u2) 4.9.2
  17 debian:9                      : Ok   gcc (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
  18 debian:experimental           : Ok   gcc (Debian 8.3.0-7) 8.3.0
  19 debian:experimental-x-arm64   : Ok   aarch64-linux-gnu-gcc (Debian 8.3.0-7) 8.3.0
  20 debian:experimental-x-mips    : Ok   mips-linux-gnu-gcc (Debian 8.3.0-7) 8.3.0
  21 debian:experimental-x-mips64  : Ok   mips64-linux-gnuabi64-gcc (Debian 8.3.0-7) 8.3.0
  22 debian:experimental-x-mipsel  : Ok   mipsel-linux-gnu-gcc (Debian 8.3.0-7) 8.3.0
  23 fedora:20                     : Ok   gcc (GCC) 4.8.3 20140911 (Red Hat 4.8.3-7)
  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) 8.3.1 20190223 (Red Hat 8.3.1-2)
  32 fedora:29                     : Ok   gcc (GCC) 8.3.1 20190223 (Red Hat 8.3.1-2)
  33 fedora:30                     : Ok   gcc (GCC) 9.1.1 20190503 (Red Hat 9.1.1-1)
  34 fedora:30-x-ARC-glibc         : Ok   arc-linux-gcc (ARC HS GNU/Linux glibc toolchain 2019.03-rc1) 8.3.1 20190225
  35 fedora:30-x-ARC-uClibc        : Ok   arc-linux-gcc (ARCv2 ISA Linux uClibc toolchain 2019.03-rc1) 8.3.1 20190225
  36 fedora:rawhide                : Ok   gcc (GCC) 9.0.1 20190418 (Red Hat 9.0.1-0.14)
  37 gentoo-stage3-amd64:latest    : Ok   gcc (Gentoo 8.3.0-r1 p1.1) 8.3.0
  38 mageia:5                      : Ok   gcc (GCC) 4.9.2
  39 mageia:6                      : Ok   gcc (Mageia 5.5.0-1.mga6) 5.5.0
  40 opensuse:15.0                 : Ok   gcc (SUSE Linux) 7.4.0
  41 opensuse:15.1                 : Ok   gcc (SUSE Linux) 7.4.0
  42 opensuse:42.3                 : Ok   gcc (SUSE Linux) 4.8.5
  43 opensuse:tumbleweed           : Ok   gcc (SUSE Linux) 9.1.1 20190520 [gcc-9-branch revision 271396]
  44 oraclelinux:6                 : Ok   gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23.0.1)
  45 oraclelinux:7                 : Ok    gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-36.0.1)
  46 ubuntu:12.04.5                : Ok   gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
  47 ubuntu:14.04.4                : Ok   gcc (Ubuntu 4.8.4-2ubuntu1~14.04.4) 4.8.4
  48 ubuntu:16.04                  : Ok   gcc (Ubuntu 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609
  49 ubuntu:16.04-x-arm            : Ok   arm-linux-gnueabihf-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  50 ubuntu:16.04-x-arm64          : Ok   aarch64-linux-gnu-gcc (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  51 ubuntu:16.04-x-powerpc        : Ok   powerpc-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  52 ubuntu:16.04-x-powerpc64      : Ok   powerpc64-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  53 ubuntu:16.04-x-powerpc64el    : Ok   powerpc64le-linux-gnu-gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  54 ubuntu:16.04-x-s390           : Ok   s390x-linux-gnu-gcc (Ubuntu 5.4.0-6ubuntu1~16.04.9) 5.4.0 20160609
  55 ubuntu:17.10                  : Ok   gcc (Ubuntu 7.2.0-8ubuntu3.2) 7.2.0
  56 ubuntu:18.04                  : Ok   gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  57 ubuntu:18.04-x-arm            : Ok   arm-linux-gnueabihf-gcc (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04) 7.4.0
  58 ubuntu:18.04-x-arm64          : Ok   aarch64-linux-gnu-gcc (Ubuntu/Linaro 7.4.0-1ubuntu1~18.04) 7.4.0
  59 ubuntu:18.04-x-m68k           : Ok   m68k-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  60 ubuntu:18.04-x-powerpc        : Ok   powerpc-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  61 ubuntu:18.04-x-powerpc64      : Ok   powerpc64-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  62 ubuntu:18.04-x-powerpc64el    : Ok   powerpc64le-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  63 ubuntu:18.04-x-riscv64        : Ok   riscv64-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  64 ubuntu:18.04-x-s390           : Ok   s390x-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  65 ubuntu:18.04-x-sh4            : Ok   sh4-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  66 ubuntu:18.04-x-sparc64        : Ok   sparc64-linux-gnu-gcc (Ubuntu 7.4.0-1ubuntu1~18.04) 7.4.0
  67 ubuntu:18.10                  : Ok   gcc (Ubuntu 8.3.0-6ubuntu1~18.10) 8.3.0
  68 ubuntu:19.04                  : Ok   gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0
  69 ubuntu:19.04-x-alpha          : Ok   alpha-linux-gnu-gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0
  70 ubuntu:19.04-x-arm64          : Ok   aarch64-linux-gnu-gcc (Ubuntu/Linaro 8.3.0-6ubuntu1) 8.3.0
  71 ubuntu:19.04-x-hppa           : Ok   hppa-linux-gnu-gcc (Ubuntu 8.3.0-6ubuntu1) 8.3.0
  #

  # uname -a
  Linux quaco 5.2.0-rc1+ #1 SMP Thu May 23 10:37:55 -03 2019 x86_64 x86_64 x86_64 GNU/Linux
  # git log --oneline -1
  a7350998a25a tools headers UAPI: Sync kvm.h headers with the kernel sources
  # perf version --build-options
  perf version 5.2.rc1.ga735099
                   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
                     aio: [ on  ]  # HAVE_AIO_SUPPORT
                    zstd: [ on  ]  # HAVE_ZSTD_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: probe libc's inet_pton & backtrace it with ping       : Ok
  65: Use vfs_getname probe to get syscall args filenames   : Ok
  66: Add vfs_getname probe to get syscall args filenames   : Ok
  67: Check open filename arg using perf trace + vfs_getname: Ok
  68: Zstd perf.data compression/decompression              : Ok
  #

  $ make -C tools/perf build-test
  make: Entering directory '/home/acme/git/perf/tools/perf'
  - tarpkg: ./tests/perf-targz-src-pkg .
                make_install_O: make install
             make_no_libnuma_O: make NO_LIBNUMA=1
              make_no_libelf_O: make NO_LIBELF=1
                  make_no_ui_O: make NO_NEWT=1 NO_SLANG=1 NO_GTK2=1
              make_clean_all_O: make clean all
                   make_tags_O: make tags
         make_with_clangllvm_O: make LIBCLANGLLVM=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 NO_LIBZSTD=1
                 make_cscope_O: make cscope
                make_no_gtk2_O: make NO_GTK2=1
              make_no_libbpf_O: make NO_LIBBPF=1
                   make_help_O: make help
            make_no_demangle_O: make NO_DEMANGLE=1
            make_no_auxtrace_O: make NO_AUXTRACE=1
               make_no_slang_O: make NO_SLANG=1
   make_install_prefix_slash_O: make install prefix=/tmp/krava/
                 make_static_O: make LDFLAGS=-static
             make_no_libperl_O: make NO_LIBPERL=1
             make_no_scripts_O: make NO_LIBPYTHON=1 NO_LIBPERL=1
                  make_debug_O: make DEBUG=1
                 make_perf_o_O: make perf.o
        make_with_babeltrace_O: make LIBBABELTRACE=1
           make_no_libpython_O: make NO_LIBPYTHON=1
         make_install_prefix_O: make install prefix=/tmp/krava
                   make_pure_O: make
            make_no_libaudit_O: make NO_LIBAUDIT=1
             make_util_map_o_O: make util/map.o
                make_no_newt_O: make NO_NEWT=1
           make_no_libunwind_O: make NO_LIBUNWIND=1
  make_no_libdw_dwarf_unwind_O: make NO_LIBDW_DWARF_UNWIND=1
           make_no_libbionic_O: make NO_LIBBIONIC=1
           make_no_backtrace_O: make NO_BACKTRACE=1
       make_util_pmu_bison_o_O: make util/pmu-bison.o
                    make_doc_O: make doc
            make_install_bin_O: make install-bin
  OK
  make: Leaving directory '/home/acme/git/perf/tools/perf'
  $