perf/ebpf basic integration

Browse source

Please see the changeset comments, but this is the very basic integration of
 perf with libbpf that, given a .o file built for the 'bpf' target with clang,
 will get it validated and loaded into the kernel via the sys_bpf syscall, which
 can be seen using 'perf trace' to trace the whole thing looking just for the
 bpf and perf_event_open syscalls:
 
   # perf trace -e bpf,perf_event_open perf record -g --event /tmp/foo.o -a
    362.779 ( 0.129 ms): perf/22408 bpf(cmd: 5, uattr: 0x7ffd4edb6db0, size: 48                           ) = 3
    384.192 ( 0.016 ms): perf/22408 perf_event_open(attr_uptr: 0x7ffd4edbace0, pid: -1, cpu: 3, group_fd: -1, flags: FD_CLOEXEC) = 5
    384.247 ( 0.038 ms): perf/22408 perf_event_open(attr_uptr: 0x37aedd8, pid: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
    384.261 ( 0.007 ms): perf/22408 perf_event_open(attr_uptr: 0x37aedd8, pid: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
    387.680 ( 3.413 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
    387.688 ( 0.005 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, cpu: 1, group_fd: -1, flags: FD_CLOEXEC) = 6
    387.693 ( 0.004 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, cpu: 2, group_fd: -1, flags: FD_CLOEXEC) = 7
    387.698 ( 0.003 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, cpu: 3, group_fd: -1, flags: FD_CLOEXEC) = 8
   ^C[ perf record: Woken up 1 times to write data ]
     [ perf record: Captured and wrote 0.221 MB perf.data (2 samples) ]
   # perf script
   bash 18389 [002] 83446.412607: perf_bpf_probe:fork: (ffffffff8109be30)
                   29be31 _do_fork (/lib/modules/4.3.0-rc6+/build/vmlinux)
                   96d662 tracesys_phase2 (/lib/modules/4.3.0-rc6+/build/vmlinux)
                    bd56c __libc_fork (/usr/lib64/libc-2.17.so)
                    413b2 make_child (/usr/bin/bash)
 
   bash 18389 [002] 83447.227255: perf_bpf_probe:fork: (ffffffff8109be30)
                   29be31 _do_fork (/lib/modules/4.3.0-rc6+/build/vmlinux)
                   96d662 tracesys_phase2 (/lib/modules/4.3.0-rc6+/build/vmlinux)
                    bd56c __libc_fork (/usr/lib64/libc-2.17.so)
                    413b2 make_child (/usr/bin/bash)
 
   # perf evlist -v
   perf_bpf_probe:fork: type: 2, size: 112, config: 0x6cf, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CALLCHAIN|CPU|PERIOD|RAW, disabled: 1, inherit: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
   #
 
 More work is about to be reviewed, tested and merged that will allow the whole
 process of going from a .c file to an .o file via clang, etc to be done
 automagically. (Wang Nan)
 
 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIcBAABAgAGBQJWMPzEAAoJENZQFvNTUqpAib4P/Ronv5SdIHxT1OfVZ6GiK9oG
 b+K72dAFcOZVg0aSRIe0s9jczKEomJBkT8H7JG5JOPGD94E/asWnItjuS9EwTaQG
 E2m/+OMwb0LhL4OeF7KH4YBAhNFMpBzlIO+IgHky8FNwuk2sa/dgPK8Xav3NLHzn
 yNunz+282RcSt9XE06Pm/tMCkcMQIvPbjRcXV5McA0zJYkCZDCYDKl3i11ypJY3K
 7t5sdz2Rau0wwG5XEsr5ZxQB4jphlzeYA+5YxiYxFigHlg/nSskzrwwSwxzQBSJb
 tHVBV9GQYVj2KEqS60kO4lNNTUPdhF92GNh3GSKa/laxtUYu+fBm224oz3cES86B
 oh8B8B05eSyj9WM4u23TSHir7Z8ppbtzTVfBXJNDO63dMZ/EhlL8r6uzfKNB3zM2
 aXMyUfcrF9wK8wnds4MA9VGwmkkXx3ailOH5zIskTNSzU5FK6WWAPptNFI1ykxJb
 56poai9g5F1VqE5X90yHgzRFC/Vc6GC4KuOjtw9ixzPZ6zA8TLYrDEtIeP5eZoC6
 ZaI8jF6+8+nOVoDwsYIoEYE+IFi/zhmpOOQ0eNoAv2+o6FaPJ7tSNmDMMcgE1CQN
 x9jVvAb3eVFuh5dLhLiCPxkE7qv8kAARt2qNncscMBTEVRJ3mNGSvjQcYB5ScOnp
 /W6no1caIEPGr/AZIXch
 =xGPO
 -----END PGP SIGNATURE-----

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

Pull basic perf/ebpf integration:

 "Please see the changeset comments, but this is the very basic integration of
  perf with libbpf that, given a .o file built for the 'bpf' target with clang,
  will get it validated and loaded into the kernel via the sys_bpf syscall, which
  can be seen using 'perf trace' to trace the whole thing looking just for the
  bpf and perf_event_open syscalls:

    # perf trace -e bpf,perf_event_open perf record -g --event /tmp/foo.o -a
     362.779 ( 0.129 ms): perf/22408 bpf(cmd: 5, uattr: 0x7ffd4edb6db0, size: 48                           ) = 3
     384.192 ( 0.016 ms): perf/22408 perf_event_open(attr_uptr: 0x7ffd4edbace0, pid: -1, cpu: 3, group_fd: -1, flags: FD_CLOEXEC) = 5
     384.247 ( 0.038 ms): perf/22408 perf_event_open(attr_uptr: 0x37aedd8, pid: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
     384.261 ( 0.007 ms): perf/22408 perf_event_open(attr_uptr: 0x37aedd8, pid: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
     387.680 ( 3.413 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, group_fd: -1, flags: FD_CLOEXEC) = 5
     387.688 ( 0.005 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, cpu: 1, group_fd: -1, flags: FD_CLOEXEC) = 6
     387.693 ( 0.004 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, cpu: 2, group_fd: -1, flags: FD_CLOEXEC) = 7
     387.698 ( 0.003 ms): perf/22408 perf_event_open(attr_uptr: 0x3222f08, pid: -1, cpu: 3, group_fd: -1, flags: FD_CLOEXEC) = 8
    ^C[ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.221 MB perf.data (2 samples) ]
    # perf script
    bash 18389 [002] 83446.412607: perf_bpf_probe:fork: (ffffffff8109be30)
                    29be31 _do_fork (/lib/modules/4.3.0-rc6+/build/vmlinux)
                    96d662 tracesys_phase2 (/lib/modules/4.3.0-rc6+/build/vmlinux)
                     bd56c __libc_fork (/usr/lib64/libc-2.17.so)
                     413b2 make_child (/usr/bin/bash)

    bash 18389 [002] 83447.227255: perf_bpf_probe:fork: (ffffffff8109be30)
                    29be31 _do_fork (/lib/modules/4.3.0-rc6+/build/vmlinux)
                    96d662 tracesys_phase2 (/lib/modules/4.3.0-rc6+/build/vmlinux)
                     bd56c __libc_fork (/usr/lib64/libc-2.17.so)
                     413b2 make_child (/usr/bin/bash)

    # perf evlist -v
    perf_bpf_probe:fork: type: 2, size: 112, config: 0x6cf, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CALLCHAIN|CPU|PERIOD|RAW, disabled: 1, inherit: 1, mmap: 1, comm: 1, task: 1, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
    #

  More work is about to be reviewed, tested and merged that will allow the whole
  process of going from a .c file to an .o file via clang, etc to be done
  automagically. (Wang Nan)"

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

...

This commit is contained in:

Ingo Molnar 2015-10-29 13:17:56 +01:00

parent 6fc774ef4c 4edf30e39e

commit 66a565c203

13 changed files with 619 additions and 7 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

tools/build/Makefile.feature

View file

3

tools/perf/MANIFEST

View file

21

tools/perf/Makefile.perf

View file

19

tools/perf/config/Makefile

View file

2

tools/perf/perf.c

View file

4

tools/perf/tests/make

View file

1

tools/perf/util/Build

View file

339

tools/perf/util/bpf-loader.c

View file

84

tools/perf/util/bpf-loader.h

View file

118

tools/perf/util/parse-events.c

View file

8

tools/perf/util/parse-events.h

View file

3

tools/perf/util/parse-events.l

View file

18

tools/perf/util/parse-events.y

View file