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From: Jiri Olsa <jolsa@redhat.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	Daniel Borkmann <daniel@iogearbox.net>,
	John Fastabend <john.fastabend@gmail.com>,
	Network Development <netdev@vger.kernel.org>,
	bpf <bpf@vger.kernel.org>, Kernel Team <kernel-team@fb.com>
Subject: Re: [PATCH v2 bpf-next 3/4] selftests/bpf: Add profiler test
Date: Tue, 13 Oct 2020 23:59:15 +0200	[thread overview]
Message-ID: <20201013215915.GC1305928@krava> (raw)
In-Reply-To: <CAADnVQLYSk0YgK7_dUSF-5Rau10vOdDgosVhE9xmEr1dp+=2vg@mail.gmail.com>

On Tue, Oct 13, 2020 at 02:03:33PM -0700, Alexei Starovoitov wrote:
> On Tue, Oct 13, 2020 at 12:56 PM Jiri Olsa <jolsa@redhat.com> wrote:
> >
> > On Thu, Oct 08, 2020 at 06:12:39PM -0700, Alexei Starovoitov wrote:
> >
> > SNIP
> >
> > > +
> > > +#ifdef UNROLL
> > > +#pragma unroll
> > > +#endif
> > > +     for (int i = 0; i < MAX_CGROUPS_PATH_DEPTH; i++) {
> > > +             filepart_length =
> > > +                     bpf_probe_read_str(payload, MAX_PATH, BPF_CORE_READ(cgroup_node, name));
> > > +             if (!cgroup_node)
> > > +                     return payload;
> > > +             if (cgroup_node == cgroup_root_node)
> > > +                     *root_pos = payload - payload_start;
> > > +             if (filepart_length <= MAX_PATH) {
> > > +                     barrier_var(filepart_length);
> > > +                     payload += filepart_length;
> > > +             }
> > > +             cgroup_node = BPF_CORE_READ(cgroup_node, parent);
> > > +     }
> > > +     return payload;
> > > +}
> > > +
> > > +static ino_t get_inode_from_kernfs(struct kernfs_node* node)
> > > +{
> > > +     struct kernfs_node___52* node52 = (void*)node;
> > > +
> > > +     if (bpf_core_field_exists(node52->id.ino)) {
> > > +             barrier_var(node52);
> > > +             return BPF_CORE_READ(node52, id.ino);
> > > +     } else {
> > > +             barrier_var(node);
> > > +             return (u64)BPF_CORE_READ(node, id);
> > > +     }
> > > +}
> > > +
> > > +int pids_cgrp_id = 1;
> >
> >
> > hi,
> > I'm getting compilation failure with this:
> >
> >           CLNG-LLC [test_maps] profiler2.o
> >         In file included from progs/profiler2.c:6:
> >         progs/profiler.inc.h:246:5: error: redefinition of 'pids_cgrp_id' as different kind of symbol
> >         int pids_cgrp_id = 1;
> >             ^
> >         /home/jolsa/linux-qemu/tools/testing/selftests/bpf/tools/include/vmlinux.h:14531:2: note: previous definition is here
> >                 pids_cgrp_id = 11,
> 
> Interesting.
> You probably have CONFIG_CGROUP_PIDS in your .config?

yes

jirka


> I don't and bpf CI doesn't have it either, so this issue wasn't spotted earlier.
> 
> I can hard code 11, of course, but
> but maybe Andrii has a cool way to use co-re to deal with this?
> I think
> "extern bool CONFIG_CGROUP_PIDS __kconfig"
> won't work.
> A good opportunity to try to use bpf_core_enum_value_exists() ?
> 


  parent reply	other threads:[~2020-10-13 21:59 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-09  1:12 [PATCH v2 bpf-next 0/4] bpf: Make the verifier recognize llvm register allocation patterns Alexei Starovoitov
2020-10-09  1:12 ` [PATCH v2 bpf-next 1/4] bpf: Propagate scalar ranges through register assignments Alexei Starovoitov
2020-10-09 19:42   ` John Fastabend
2020-10-09  1:12 ` [PATCH v2 bpf-next 2/4] bpf: Track spill/fill of bounded scalars Alexei Starovoitov
2020-10-09 19:49   ` John Fastabend
2020-10-09  1:12 ` [PATCH v2 bpf-next 3/4] selftests/bpf: Add profiler test Alexei Starovoitov
2020-10-09  6:49   ` Yonghong Song
2020-10-09 15:08     ` Alexei Starovoitov
2020-10-09 15:13       ` Yonghong Song
2020-10-13 19:56   ` Jiri Olsa
2020-10-13 21:03     ` Alexei Starovoitov
2020-10-13 21:56       ` Andrii Nakryiko
2020-10-15  6:09         ` Song Liu
2020-11-04 16:45           ` Jiri Olsa
2020-11-04 20:50             ` Andrii Nakryiko
2020-11-04 21:57               ` Jiri Olsa
2020-10-13 21:59       ` Jiri Olsa [this message]
2020-10-14  0:21     ` Song Liu
2020-10-09  1:12 ` [PATCH v2 bpf-next 4/4] selftests/bpf: Asm tests for the verifier regalloc tracking Alexei Starovoitov
2020-10-09 20:06   ` John Fastabend
2020-10-09 20:10 ` [PATCH v2 bpf-next 0/4] bpf: Make the verifier recognize llvm register allocation patterns patchwork-bot+netdevbpf

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