Merge tag 'perf-core-for-mingo-20160224' of git://git.kernel.org/pub/scm/linux/kernel...

Pull perf/core improvements from Arnaldo Carvalho de Melo:

User visible changes:

  - Hierarchy histogram mode for 'perf top' and 'perf report', showing multiple
    levels, one per --sort entry: (Namhyung Kim)

    On a mostly idle system:

    # perf top --hierarchy -s comm,dso

    Then expand some levels and use 'P' to take a snapshot:

    # cat perf.hist.0
    -  92.32%         perf
          58.20%         perf
          22.29%         libc-2.22.so
           5.97%         [kernel]
           4.18%         libelf-0.165.so
           1.69%         [unknown]
    -   4.71%         qemu-system-x86
           3.10%         [kernel]
           1.60%         qemu-system-x86_64 (deleted)
    +   2.97%         swapper
    #

  - Check availability of memory events in 'perf mem': (Jiri Olsa)

    On a Intel Broadwell machine:

    # perf mem record -e list
    ldlat-loads : available
    ldlat-stores: available
    #

  - Decode data_src values (e.g. perf.data files generated by 'perf mem record')
    in 'perf script': (Jiri Olsa)

    # perf script
      perf 693 [1] 4.088652: 1 cpu/mem-loads,ldlat=30/P: ffff88007d0b0f40 68100142 L1 hit|SNP None|TLB L1 or L2 hit|LCK No <SNIP>
                                                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  - Print bpf-output events in 'perf script': (Wang Nan).

    # perf record -e bpf-output/no-inherit,name=evt/ -e ./test_bpf_output_3.c/map:channel.event=evt/ usleep 1000
    # perf script
       usleep  4882 21384.532523:   evt:  ffffffff810e97d1 sys_nanosleep ([kernel.kallsyms])
        BPF output: 0000: 52 61 69 73 65 20 61 20  Raise a
                    0008: 42 50 46 20 65 76 65 6e  BPF even
                    0010: 74 21 00 00              t!..
        BPF string: "Raise a BPF event!"
    #

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