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Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf

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On 15 December 2016 at 14:00, Joe Stringer <joe@ovn.org> wrote:
> On 15 December 2016 at 10:34, Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
>> Em Thu, Dec 15, 2016 at 03:29:18PM -0300, Arnaldo Carvalho de Melo escreveu:
>>> Em Thu, Dec 15, 2016 at 12:50:22PM -0300, Arnaldo Carvalho de Melo escreveu:
>>> > Em Wed, Dec 14, 2016 at 02:43:39PM -0800, Joe Stringer escreveu:
>>> > > Now that libbpf under tools/lib/bpf/* is synced with the version from
>>> > > samples/bpf, we can get rid most of the libbpf library here.
>>> > >
>>> > > Signed-off-by: Joe Stringer <joe@ovn.org>
>>> > > Cc: Alexei Starovoitov <ast@fb.com>
>>> > > Cc: Daniel Borkmann <daniel@iogearbox.net>
>>> > > Cc: Wang Nan <wangnan0@huawei.com>
>>> > > Link: http://lkml.kernel.org/r/20161209024620.31660-6-joe@ovn.org
>>> > > [ Use -I$(srctree)/tools/lib/ to support out of source code tree builds, as noticed by Wang Nan ]
>>>
>>> So, the above comment no longer applied to this adjusted patch from you,
>>> as you removed one hunk too much, that, after applied, gets samples/bpf/
>>> to build successfully:
>>>
>>> diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
>>> index add514e2984a..81b0ef2f7994 100644
>>> --- a/samples/bpf/Makefile
>>> +++ b/samples/bpf/Makefile
>>> @@ -107,6 +107,7 @@ always += lwt_len_hist_kern.o
>>>  always += xdp_tx_iptunnel_kern.o
>>>
>>>  HOSTCFLAGS += -I$(objtree)/usr/include
>>> +HOSTCFLAGS += -I$(srctree)/tools/lib/
>>>  HOSTCFLAGS += -I$(srctree)/tools/testing/selftests/bpf/
>>>
>>>  HOSTCFLAGS_bpf_load.o += -I$(objtree)/usr/include -Wno-unused-variable
>>>
>>> ---------------------
>>>
>>> I added it, continuing...
>>
>> But then, when I tried to run offwaketime with it, it fails:
>>
>> [root@jouet bpf]# ./offwaketime  ls
>> bpf_load_program() err=22
>> BPF_LDX uses reserved fields
>> bpf_load_program() err=22
>> BPF_LDX uses reserved fields
>> [root@jouet bpf]#
>>
>> If I remove this patch and try again, it works:
>>
>> [root@jouet bpf]# ./offwaketime | head -4
>> swapper/1;start_secondary;cpu_startup_entry;schedule_preempt_disabled;schedule;__schedule;-;---;; 46
>> chrome;return_from_SYSCALL_64;do_syscall_64;exit_to_usermode_loop;schedule;__schedule;-;try_to_wake_up;do_futex;sys_futex;do_syscall_64;return_from_SYSCALL_64;;Chrome_ChildIOT 1
>> 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 3
>> dockerd-current;entry_SYSCALL_64_fastpath;sys_select;core_sys_select;do_select;poll_schedule_timeout;schedule_hrtimeout_range;schedule_hrtimeout_range_clock;schedule;__schedule;-;try_to_wake_up;futex_wake;do_futex;sys_futex;entry_SYSCALL_64_fastpath;;dockerd-current 2
>> [root@jouet bpf]#
>>
>>
>> So, I'm stopping here so that I can push what I have to Ingo, then I'll get
>> back to this, hopefully by then you beat me and I have just to retest 8-)
>
> OK, thanks for the report. Looks like there was another difference
> between the two libbpfs - one used total program size for its
> load_program API; the actual kernel API uses instruction count. This
> incremental should do the trick:
>
> https://github.com/joestringer/linux/commit/6ff7726f20077bed66fb725f5189c13690154b6a

The full branch with this change (fast-forward from your tmp branch)
is available here:
https://github.com/joestringer/linux/tree/submit/libbpf_samples_v5

I tried running every selftest and BPF sample I could get my hands on;
there's one or two that I couldn't run, but seemed more to do with my
versions of TC/iproute and kernel config rather than libbpf changes.
Let me know if you see any further trouble.

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[PATCH perf/core REBASE 0/5] Reuse libbpf from samples/bpf Joe Stringer <joe@ovn.org> - 2016-12-15 00:00 +0100
  [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Joe Stringer <joe@ovn.org> - 2016-12-15 00:00 +0100
    Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-15 17:00 +0100
      Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-15 19:40 +0100
        Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-15 19:50 +0100
        Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-15 19:50 +0100
          Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Joe Stringer <joe@ovn.org> - 2016-12-15 23:10 +0100
            Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Joe Stringer <joe@ovn.org> - 2016-12-16 02:50 +0100
              Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@redhat.com> - 2016-12-16 15:30 +0100
              Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-16 16:50 +0100
              Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-20 14:50 +0100
      Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Joe Stringer <joe@ovn.org> - 2016-12-15 19:40 +0100
        Re: [PATCH perf/core REBASE 2/5] samples/bpf: Switch over to libbpf Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-15 20:10 +0100
  [PATCH perf/core REBASE 3/5] tools lib bpf: Add bpf_prog_{attach,detach} Joe Stringer <joe@ovn.org> - 2016-12-15 00:10 +0100
    Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add  bpf_prog_{attach,detach} Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-20 15:20 +0100
      Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add  bpf_prog_{attach,detach} Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-20 15:40 +0100
        Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add bpf_prog_{attach,detach} Joe Stringer <joe@ovn.org> - 2016-12-20 20:00 +0100
          Re: [PATCH perf/core REBASE 3/5] tools lib bpf: Add  bpf_prog_{attach,detach} Arnaldo Carvalho de Melo <acme@kernel.org> - 2016-12-21 17:10 +0100
  [PATCH perf/core REBASE 4/5] samples/bpf: Remove perf_event_open() declaration Joe Stringer <joe@ovn.org> - 2016-12-15 00:10 +0100
  [PATCH perf/core REBASE 1/5] samples/bpf: Make samples more libbpf-centric Joe Stringer <joe@ovn.org> - 2016-12-15 00:10 +0100
    [tip:perf/urgent] samples/bpf: Make samples more libbpf-centric tip-bot for Joe Stringer <tipbot@zytor.com> - 2016-12-20 20:30 +0100
  [PATCH perf/core REBASE 5/5] samples/bpf: Move open_raw_sock to separate header Joe Stringer <joe@ovn.org> - 2016-12-15 00:10 +0100

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