• Joe Stringer's avatar
    samples/bpf: Make samples more libbpf-centric · d40fc181
    Joe Stringer authored
    Switch all of the sample code to use the function names from
    tools/lib/bpf so that they're consistent with that, and to declare their
    own log buffers. This allow the next commit to be purely devoted to
    getting rid of the duplicate library in samples/bpf.
    
    Committer notes:
    
    Testing it:
    
    On a fedora rawhide container, with clang/llvm 3.9, sharing the host
    linux kernel git tree:
    
      # make O=/tmp/build/linux/ headers_install
      # make O=/tmp/build/linux -C samples/bpf/
    
    Since I forgot to make it privileged, just tested it outside the
    container, using what it generated:
    
      # uname -a
      Linux jouet 4.9.0-rc8+ #1 SMP Mon Dec 12 11:20:49 BRT 2016 x86_64 x86_64 x86_64 GNU/Linux
      # cd /var/lib/docker/devicemapper/mnt/c43e09a53ff56c86a07baf79847f00e2cc2a17a1e2220e1adbf8cbc62734feda/rootfs/tmp/build/linux/samples/bpf/
      # ls -la offwaketime
      -rwxr-xr-x. 1 root root 24200 Dec 15 12:19 offwaketime
      # file offwaketime
      offwaketime: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=c940d3f127d5e66cdd680e42d885cb0b64f8a0e4, not stripped
      # readelf -SW offwaketime_kern.o  | grep PROGBITS
      [ 2] .text             PROGBITS        0000000000000000 000040 000000 00  AX  0   0  4
      [ 3] kprobe/try_to_wake_up PROGBITS        0000000000000000 000040 0000d8 00  AX  0   0  8
      [ 5] tracepoint/sched/sched_switch PROGBITS        0000000000000000 000118 000318 00  AX  0   0  8
      [ 7] maps              PROGBITS        0000000000000000 000430 000050 00  WA  0   0  4
      [ 8] license           PROGBITS        0000000000000000 000480 000004 00  WA  0   0  1
      [ 9] version           PROGBITS        0000000000000000 000484 000004 00  WA  0   0  4
      # ./offwaketime | head -5
      swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 106
      CPU 0/KVM;entry_SYSCALL_64_fastpath;sys_ioctl;do_vfs_ioctl;kvm_vcpu_ioctl;kvm_arch_vcpu_ioctl_run;kvm_vcpu_block;schedule;__schedule;-;try_to_wake_up;swake_up_locked;swake_up;apic_timer_expired;apic_timer_fn;__hrtimer_run_queues;hrtimer_interrupt;local_apic_timer_interrupt;smp_apic_timer_interrupt;__irqentry_text_start;cpuidle_enter;call_cpuidle;cpu_startup_entry;start_secondary;;swapper/3 2
      Compositor;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;futex_requeue;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;SoftwareVsyncTh 5
      firefox;entry_SYSCALL_64_fastpath;sys_poll;do_sys_poll;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;pollwake;__wake_up_common;__wake_up_sync_key;pipe_write;__vfs_write;vfs_write;sys_write;entry_SYSCALL_64_fastpath;;Timer 13
      JS Helper;entry_SYSCALL_64_fastpath;sys_futex;do_futex;futex_wait;futex_wait_queue_me;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;firefox 2
      #
    Signed-off-by: default avatarJoe Stringer <joe@ovn.org>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Alexei Starovoitov <ast@fb.com>
    Cc: Daniel Borkmann <daniel@iogearbox.net>
    Cc: Wang Nan <wangnan0@huawei.com>
    Cc: netdev@vger.kernel.org
    Link: http://lkml.kernel.org/r/20161214224342.12858-2-joe@ovn.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    d40fc181
lathist_user.c 1.99 KB