Merge tag 'perf-core-for-mingo-4.16-20180110' of git://git.kernel.org/pub/scm/linux...

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

- The 'perf test bpf' entry hooked a eBPF proggie to the
  SyS_epoll_wait() kernel function and expected it to be hit when calling
  the epoll_wait() libc wrapper, which changed recently, in systems such
  as Fedora 27, with the glibc wrapper calling instead the epoll_pwait()
  syscall, so switch to epoll_pwait() for both the kernel and libc
  function, getting it to work both in old and new systems (Arnaldo Carvalho de Melo)

- Beautify 'gettid' syscall result in 'perf trace', and in doing so
  noticed that we need to handle namespaces in 'perf trace', will be
  dealt with in follow up patches where we'll try to figure out if
  the recent support for namespace in tools/perf/ can be used for this
  purpose as well. (Arnaldo Carvalho de Melo)

- Introduce 'perf report --mmaps' and 'perf report --tasks' to show
  info present in 'perf.data' (Jiri Olsa, Arnaldo Carvalho de Melo)

- Synchronize kernel <-> tooling headers wrt meltdown/spectre changes
  (Arnaldo Carvalho de Melo)

- Fix a wrong offset issue when using /proc/kcore (Jin Yao)

- Fix bug that prevented annotating symbols in perf.data files
  generated with 'perf record --branch-any'  (Jin Yao)

- Add infrastructure to record first and last sample time to the
  perf.data file header, so that when processing all samples in
  a 'perf record' session, such as when doing build-id processing,
  or when specifically requesting that that info be recorded, use
  that in 'perf report --time', that also got support for percent
  slices in addition to absolute ones.

  I.e. now it is possible to ask for the samples in the 10%-20%
  time slice of a perf.data file (Jin Yao)

- Enable building with libbabeltrace by default (Jiri Olsa)

- Display perf_event_attr::namespaces when duping the attributes
  in verbose mode (Jiri Olsa)

- Allocate context task_ctx_data for child event (Jiri Olsa)

- Update comments for PERF_RECORD_ITRACE_START and PERF_RECORD_MISC_* (Jiri Olsa)

- Add support for showing PERF_RECORD_LOST events in 'perf script' (Jiri Olsa)

- Add 'perf report --stats' option to display quick statistics about
  metadata events (PERF_RECORD_*) i.e. what we get at the end of 'perf
  report -D' (Jiri Olsa)

- Fix compile error with libunwind x86 (Wang Nan)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>