Re: [PATCH v1 0/5] Enable BPF skeletons by default

[Ian Rogers]

On Tue, Sep 19, 2023 at 6:16 AM Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
>
> Em Mon, Sep 18, 2023 at 04:40:15PM -0700, Namhyung Kim escreveu:
> > On Thu, Sep 14, 2023 at 2:20 PM Ian Rogers <irogers@xxxxxxxxxx> wrote:
> > >
> > > Enable BPF skeletons by default but warn don't fail if they can't be
> > > supported. This was the intended behavior for Linux 6.4 but it caused
> > > an issue captured in this thread:
> > > https://lore.kernel.org/lkml/20230503211801.897735-1-acme@xxxxxxxxxx/
> > >
> > > This issue isn't repeated here as the previous issue related to
> > > generating vmlinux.h, which is no longer performed by default as a
> > > checked-in vmlinux.h is used instead.
> > >
> > > Unlike with those changes, the BUILD_BPF_SKEL is kept and setting it
> > > to 0 disables BPF skeletons. Also, rather than fail the build due to a
> > > missed dependency, dependencies are checked and BPF skeletons disabled
> > > if they aren't present.
> > >
> > > Some related commits:
> > > b7a2d774c9c5 perf build: Add ability to build with a generated vmlinux.h
> > > a887466562b4 perf bpf skels: Stop using vmlinux.h generated from BTF, use subset of used structs + CO-RE
> > > a2af0f6b8ef7 perf build: Add system include paths to BPF builds
> > > 5be6cecda080 perf bpf skels: Make vmlinux.h use bpf.h and perf_event.h in source directory
> > > 9a2d5178b9d5 Revert "perf build: Make BUILD_BPF_SKEL default, rename to NO_BPF_SKEL"
> > > a887466562b4 perf bpf skels: Stop using vmlinux.h generated from BTF, use subset of used structs + CO-RE
> > > 1d7966547e11 perf build: Add warning for when vmlinux.h generation fails
> > > a980755beb5a perf build: Make BUILD_BPF_SKEL default, rename to NO_BPF_SKEL
> > >
> > > Ian Rogers (5):
> > >   perf version: Add status of bpf skeletons
> > >   perf build: Default BUILD_BPF_SKEL, warn/disable for missing deps
> > >   perf test: Update build test for changed BPF skeleton defaults
> > >   perf test: Ensure EXTRA_TESTS is covered in build test
> > >   perf test: Detect off-cpu support from build options
> >
> > Tested-by: Namhyung Kim <namhyung@xxxxxxxxxx>
>
> Is this verbose by default now? Maybe its something on my side, but I
> noticed a higher level of verbosity, can you check?

I don't see more verbosity. Logs below.

Thanks,
Ian

$ git fetch --all
$ git checkout -b ptn-clean ptn/perf-tools-next
$ b4 am 20230914211948.814999-1-irogers@xxxxxxxxxx
$ git am ./20230914_irogers_enable_bpf_skeletons_by_default.mbx
$ make -C tools/perf O=/tmp/perf clean
make: Entering directory 'tools/perf'
 CLEAN   x86
 CLEAN   libapi
 CLEAN   libbpf
 CLEAN   libsubcmd
 CLEAN   libsymbol
 CLEAN   libperf
 CLEAN   fixdep
 CLEAN   feature-detect
 CLEAN   python
 CLEAN   bpf-skel
 CLEAN   coresight
 CLEAN   core-objs
 CLEAN   core-progs
 CLEAN   core-gen
 CLEAN   Documentation
make: Leaving directory 'tools/perf'
$ make -C tools/perf O=/tmp/perf
make: Entering directory 'tools/perf'
  BUILD:   Doing 'make -j8' parallel build
 HOSTCC  /tmp/perf/fixdep.o
 HOSTLD  /tmp/perf/fixdep-in.o
 LINK    /tmp/perf/fixdep
Warning: Kernel ABI header differences:
 diff -u tools/include/uapi/drm/drm.h include/uapi/drm/drm.h
 diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
 diff -u tools/include/uapi/linux/mount.h include/uapi/linux/mount.h
 diff -u tools/arch/x86/include/asm/disabled-features.h
arch/x86/include/asm/disabled-features.h
 diff -u tools/arch/x86/include/asm/cpufeatures.h
arch/x86/include/asm/cpufeatures.h
 diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
 diff -u tools/arch/x86/include/uapi/asm/prctl.h
arch/x86/include/uapi/asm/prctl.h
 diff -u tools/arch/arm64/include/uapi/asm/perf_regs.h
arch/arm64/include/uapi/asm/perf_regs.h
 diff -u tools/arch/s390/include/uapi/asm/kvm.h arch/s390/include/uapi/asm/kvm.h
 diff -u tools/include/uapi/asm-generic/unistd.h
include/uapi/asm-generic/unistd.h
 diff -u tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
arch/x86/entry/syscalls/syscall_64.tbl
 diff -u tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
arch/powerpc/kernel/syscalls/syscall.tbl
 diff -u tools/perf/arch/s390/entry/syscalls/syscall.tbl
arch/s390/kernel/syscalls/syscall.tbl
 diff -u tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl
arch/mips/kernel/syscalls/syscall_n64.tbl
 diff -u tools/perf/util/hashmap.h tools/lib/bpf/hashmap.h
Makefile.config:607: No sys/sdt.h found, no SDT events are defined,
please install systemtap-sdt-devel or systemtap-sdt-dev
Makefile.config:1009: No libcap found, disables capability support,
please install libcap-devel/libcap-dev
Makefile.config:1022: No numa.h found, disables 'perf bench numa mem'
benchmark, please install numactl-devel/libnuma-devel/libnuma-dev
Makefile.config:1081: No libbabeltrace found, disables 'perf data' CTF
format support, please install
libbabeltrace-dev[el]/libbabeltrace-ctf-dev

Auto-detecting system features:
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...                                   glibc: [ on  ]
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 GEN     /tmp/perf/common-cmds.h
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 MKDIR   /tmp/perf/libapi/fd/
 INSTALL /tmp/perf/libapi/include/api/cpu.h
 CC      /tmp/perf/libapi/fd/array.o
 INSTALL /tmp/perf/libapi/include/api/debug.h
 INSTALL /tmp/perf/libapi/include/api/io.h
 PERF_VERSION = 6.6.rc1.gda192f0aaa30
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 INSTALL /tmp/perf/libperf/include/perf/core.h
 INSTALL /tmp/perf/libapi/include/api/fd/array.h
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 INSTALL /tmp/perf/libapi/include/api/fs/fs.h
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 INSTALL libapi_headers
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 INSTALL /tmp/perf/libperf/include/perf/evlist.h
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 INSTALL /tmp/perf/libbpf/include/bpf/bpf.h
 INSTALL /tmp/perf/libbpf/include/bpf/libbpf.h
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 INSTALL /tmp/perf/libbpf/include/bpf/libbpf_common.h
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 INSTALL /tmp/perf/libbpf/include/bpf/skel_internal.h
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 LD      /tmp/perf/libapi/libapi-in.o
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Auto-detecting system features:
...                         clang-bpf-co-re: [ on  ]
...                                    llvm: [ OFF ]
...                                  libcap: [ OFF ]
...                                  libbfd: [ on  ]

 MKDIR   /tmp/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf
 MKDIR   /tmp/perf/util/bpf_skel/.tmp/bootstrap/
 MKDIR   /tmp/perf/util/bpf_skel/.tmp/bootstrap/libbpf/
 INSTALL /tmp/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/hashmap.h
 INSTALL /tmp/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/relo_core.h
 INSTALL /tmp/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_internal.h
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