Re: [PATCH 02/10] perf bpf filter: Implement event sample filtering

From: Arnaldo Carvalho de Melo
Date: Wed Mar 15 2023 - 16:13:20 EST

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Em Wed, Mar 15, 2023 at 09:51:03AM -0700, Namhyung Kim escreveu:
> On Wed, Mar 15, 2023 at 9:39 AM Arnaldo Carvalho de Melo
> <acme@xxxxxxxxxx> wrote:
> >
> > Em Wed, Mar 15, 2023 at 01:24:37PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Em Tue, Mar 14, 2023 at 04:42:29PM -0700, Namhyung Kim escreveu:
> > > > The BPF program will be attached to a perf_event and be triggered when
> > > > it overflows. It'd iterate the filters map and compare the sample
> > > > value according to the expression. If any of them fails, the sample
> > > > would be dropped.
> > > >
> > > > Also it needs to have the corresponding sample data for the expression
> > > > so it compares data->sample_flags with the given value. To access the
> > > > sample data, it uses the bpf_cast_to_kern_ctx() kfunc which was added
> > > > in v6.2 kernel.
> > > >
> > > > Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> > > > Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> > >
> > >
> > > I'm noticing this while building on a debian:11 container:
> > >
> > > GENSKEL /tmp/build/perf/util/bpf_skel/bperf_leader.skel.h
> > > GENSKEL /tmp/build/perf/util/bpf_skel/bperf_follower.skel.h
> > > GENSKEL /tmp/build/perf/util/bpf_skel/func_latency.skel.h
> > > GENSKEL /tmp/build/perf/util/bpf_skel/bpf_prog_profiler.skel.h
> > > GENSKEL /tmp/build/perf/util/bpf_skel/kwork_trace.skel.h
> > > GENSKEL /tmp/build/perf/util/bpf_skel/sample_filter.skel.h
> > > libbpf: failed to find BTF for extern 'bpf_cast_to_kern_ctx' [21] section: -2
> > > Error: failed to open BPF object file: No such file or directory
> > > make[2]: *** [Makefile.perf:1085: /tmp/build/perf/util/bpf_skel/sample_filter.skel.h] Error 254
> > > make[2]: *** Deleting file '/tmp/build/perf/util/bpf_skel/sample_filter.skel.h'
> > > make[2]: *** Waiting for unfinished jobs....
> > > make[1]: *** [Makefile.perf:236: sub-make] Error 2
> > > make: *** [Makefile:70: all] Error 2
> > > make: Leaving directory '/git/perf-6.3.0-rc1/tools/perf'
> > > + exit 1
> > > [perfbuilder@five 11]$
> >
> > Same thing on debian:10
>
> Hmm.. I thought extern symbols with__ksym are runtime
> dependencies and it should build on old kernels too.
>
> BPF folks, any suggestions?

Fedora 33 also fails, see below, but these work:

[perfbuilder@five ~]$ grep Ok dm.log/summary
1 131.48 almalinux:8 : Ok gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-16) , clang version 14.0.6 (Red Hat 14.0.6-1.module_el8.7.0+3277+b822483f)
2 132.99 almalinux:9 : Ok gcc (GCC) 11.3.1 20220421 (Red Hat 11.3.1-2) , clang version 14.0.6 (Red Hat 14.0.6-4.el9_1)
3 162.36 alpine:3.15 : Ok gcc (Alpine 10.3.1_git20211027) 10.3.1 20211027 , Alpine clang version 12.0.1
4 155.25 alpine:3.16 : Ok gcc (Alpine 11.2.1_git20220219) 11.2.1 20220219 , Alpine clang version 13.0.1
5 136.69 alpine:3.17 : Ok gcc (Alpine 12.2.1_git20220924-r4) 12.2.1 20220924 , Alpine clang version 15.0.7
6 158.08 alpine:edge : Ok gcc (Alpine 12.2.1_git20220924-r9) 12.2.1 20220924 , Alpine clang version 15.0.7
12 137.19 archlinux:base : Ok gcc (GCC) 12.2.0 , clang version 14.0.6
13 117.85 centos:stream : Ok gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-18) , clang version 15.0.7 (Red Hat 15.0.7-1.module_el8.8.0+1258+af79b238)
17 122.65 debian:experimental : Ok gcc (Debian 12.2.0-14) 12.2.0 , Debian clang version 14.0.6
30 165.29 fedora:34 : Ok gcc (GCC) 11.3.1 20220421 (Red Hat 11.3.1-2) , clang version 12.0.1 (Fedora 12.0.1-1.fc34)
33 153.26 fedora:35 : Ok gcc (GCC) 11.3.1 20220421 (Red Hat 11.3.1-3) , clang version 13.0.1 (Fedora 13.0.1-1.fc35)
34 152.66 fedora:36 : Ok gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4) , clang version 14.0.5 (Fedora 14.0.5-2.fc36)
35 154.36 fedora:37 : Ok gcc (GCC) 12.2.1 20221121 (Red Hat 12.2.1-4) , clang version 15.0.7 (Fedora 15.0.7-1.fc37)
36 145.45 fedora:38 : Ok gcc (GCC) 13.0.1 20230208 (Red Hat 13.0.1-0) , clang version 15.0.7 (Fedora 15.0.7-2.fc38)
37 166.89 fedora:rawhide : Ok gcc (GCC) 13.0.1 20230127 (Red Hat 13.0.1-0) , clang version 15.0.7 (Fedora 15.0.7-2.fc38)
44 146.10 opensuse:15.4 : Ok gcc (SUSE Linux) 7.5.0 , clang version 13.0.1
45 165.87 opensuse:15.5 : Ok gcc (SUSE Linux) 7.5.0 , clang version 15.0.2
46 167.90 opensuse:tumbleweed : Ok gcc (SUSE Linux) 12.2.1 20221020 [revision 0aaef83351473e8f4eb774f8f999bbe87a4866d7] , clang version 15.0.6
47 130.58 oraclelinux:8 : Ok gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-16.0.2) , clang version 14.0.6 (Red Hat 14.0.6-1.0.1.module+el8.7.0+20823+214a699d)
49 132.09 rockylinux:8 : Ok gcc (GCC) 8.5.0 20210514 (Red Hat 8.5.0-16) , clang version 14.0.6 (Red Hat 14.0.6-1.module+el8.7.0+1080+d88dc670)
64 161.49 ubuntu:22.04 : Ok gcc (Ubuntu 11.3.0-1ubuntu1~22.04) 11.3.0 , Ubuntu clang version 14.0.0-1ubuntu1
[perfbuilder@five ~]$

[perfbuilder@five ~]$ for a in `grep Ok dm.log/summary | cut -c15- | cut -d: -f1,2`; do grep -q GENSKEL.*sample_filter dm.log/$a && echo $a ; done
almalinux:8
almalinux:9
alpine:3.15
alpine:3.16
alpine:3.17
alpine:edge
archlinux:base
centos:stream
debian:experimental
fedora:34
fedora:35
fedora:36
fedora:37
fedora:38
fedora:rawhide
opensuse:15.4
opensuse:15.5
opensuse:tumbleweed
oraclelinux:8
rockylinux:8
ubuntu:22.04
[perfbuilder@five ~]$

Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-redhat-linux
Configured with: ../configure --enable-bootstrap --enable-languages=c,c++,fortran,objc,obj-c++,ada,go,d,lto --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-shared --enable-threads=posix --enable-checking=release --enable-multilib --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-gcc-major-version-only --with-linker-hash-style=gnu --enable-plugin --enable-initfini-array --with-isl --enable-offload-targets=nvptx-none --without-cuda-driver --enable-gnu-indirect-function --enable-cet --with-tune=generic --with-arch_32=i686 --build=x86_64-redhat-linux
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 10.3.1 20210422 (Red Hat 10.3.1-1) (GCC)
+ make PYTHON=python3 ARCH= CROSS_COMPILE= EXTRA_CFLAGS= -C tools/perf O=/tmp/build/perf
make: Entering directory '/git/perf-6.3.0-rc1/tools/perf'
BUILD: Doing 'make -j32' parallel build
HOSTCC /tmp/build/perf/fixdep.o
HOSTLD /tmp/build/perf/fixdep-in.o
LINK /tmp/build/perf/fixdep
Makefile.config:1046: No libbabeltrace found, disables 'perf data' CTF format support, please install libbabeltrace-dev[el]/libbabeltrace-ctf-dev
Makefile.config:1137: libpfm4 not found, disables libpfm4 support. Please install libpfm4-dev

Auto-detecting system features:
... dwarf: [ on ]
... dwarf_getlocations: [ on ]
... glibc: [ on ]
... libbfd: [ on ]
... libbfd-buildid: [ on ]
... libcap: [ on ]
... libelf: [ on ]
... libnuma: [ on ]
... numa_num_possible_cpus: [ on ]
... libperl: [ on ]
... libpython: [ on ]
... libcrypto: [ on ]
... libunwind: [ on ]
... libdw-dwarf-unwind: [ on ]
... zlib: [ on ]
... lzma: [ on ]
... get_cpuid: [ on ]
... bpf: [ on ]
... libaio: [ on ]
... libzstd: [ on ]

GEN /tmp/build/perf/common-cmds.h
PERF_VERSION = 6.3.rc1.gd34a77f6cd75
GEN perf-archive
GEN perf-iostat
CC /tmp/build/perf/dlfilters/dlfilter-test-api-v0.o
CC /tmp/build/perf/dlfilters/dlfilter-show-cycles.o
MKDIR /tmp/build/perf/jvmti/
MKDIR /tmp/build/perf/jvmti/
MKDIR /tmp/build/perf/jvmti/
MKDIR /tmp/build/perf/jvmti/
CC /tmp/build/perf/jvmti/libjvmti.o
CC /tmp/build/perf/jvmti/jvmti_agent.o
CC /tmp/build/perf/jvmti/libstring.o
CC /tmp/build/perf/jvmti/libctype.o
INSTALL /tmp/build/perf/libsubcmd/include/subcmd/exec-cmd.h
INSTALL /tmp/build/perf/libsubcmd/include/subcmd/help.h
INSTALL /tmp/build/perf/libsubcmd/include/subcmd/pager.h
INSTALL /tmp/build/perf/libsubcmd/include/subcmd/parse-options.h
INSTALL /tmp/build/perf/libsubcmd/include/subcmd/run-command.h
CC /tmp/build/perf/libsubcmd/exec-cmd.o
CC /tmp/build/perf/libsubcmd/help.o
CC /tmp/build/perf/libsubcmd/pager.o
CC /tmp/build/perf/libsubcmd/parse-options.o
CC /tmp/build/perf/libsubcmd/run-command.o
CC /tmp/build/perf/libsubcmd/sigchain.o
CC /tmp/build/perf/libsubcmd/subcmd-config.o
LINK /tmp/build/perf/dlfilters/dlfilter-show-cycles.so
INSTALL libsubcmd_headers
LINK /tmp/build/perf/dlfilters/dlfilter-test-api-v0.so
INSTALL /tmp/build/perf/libperf/include/perf/bpf_perf.h
INSTALL /tmp/build/perf/libperf/include/perf/core.h
INSTALL /tmp/build/perf/libperf/include/perf/cpumap.h
INSTALL /tmp/build/perf/libperf/include/perf/threadmap.h
INSTALL /tmp/build/perf/libsymbol/include/symbol/kallsyms.h
INSTALL /tmp/build/perf/libapi/include/api/cpu.h
INSTALL /tmp/build/perf/libperf/include/perf/evlist.h
INSTALL /tmp/build/perf/libapi/include/api/debug.h
INSTALL /tmp/build/perf/libperf/include/perf/evsel.h
CC /tmp/build/perf/libperf/core.o
CC /tmp/build/perf/libsymbol/kallsyms.o
CC /tmp/build/perf/libperf/cpumap.o
INSTALL /tmp/build/perf/libapi/include/api/io.h
INSTALL /tmp/build/perf/libperf/include/perf/event.h
INSTALL /tmp/build/perf/libapi/include/api/fd/array.h
MKDIR /tmp/build/perf/libapi/fd/
CC /tmp/build/perf/libperf/threadmap.o
INSTALL libsymbol_headers
INSTALL /tmp/build/perf/libperf/include/perf/mmap.h
INSTALL /tmp/build/perf/libapi/include/api/fs/fs.h
CC /tmp/build/perf/libperf/evsel.o
GEN /tmp/build/perf/libbpf/bpf_helper_defs.h
CC /tmp/build/perf/libperf/evlist.o
MKDIR /tmp/build/perf/libapi/fs/
INSTALL /tmp/build/perf/libapi/include/api/fs/tracing_path.h
MKDIR /tmp/build/perf/libapi/fs/
CC /tmp/build/perf/libapi/fd/array.o
CC /tmp/build/perf/libperf/mmap.o
MKDIR /tmp/build/perf/libapi/fs/
CC /tmp/build/perf/libperf/zalloc.o
CC /tmp/build/perf/libapi/fs/fs.o
CC /tmp/build/perf/libperf/xyarray.o
CC /tmp/build/perf/libperf/lib.o
CC /tmp/build/perf/libapi/fs/tracing_path.o
CC /tmp/build/perf/libapi/fs/cgroup.o
INSTALL /tmp/build/perf/libperf/include/internal/cpumap.h
INSTALL /tmp/build/perf/libperf/include/internal/evlist.h
CC /tmp/build/perf/libapi/cpu.o
CC /tmp/build/perf/libapi/debug.o
CC /tmp/build/perf/libapi/str_error_r.o
INSTALL /tmp/build/perf/libperf/include/internal/evsel.h
INSTALL /tmp/build/perf/libbpf/include/bpf/bpf.h
INSTALL /tmp/build/perf/libbpf/include/bpf/libbpf.h
INSTALL /tmp/build/perf/libperf/include/internal/lib.h
INSTALL libapi_headers
INSTALL /tmp/build/perf/libperf/include/internal/mmap.h
INSTALL /tmp/build/perf/libperf/include/internal/threadmap.h
INSTALL /tmp/build/perf/libperf/include/internal/xyarray.h
INSTALL /tmp/build/perf/libbpf/include/bpf/btf.h
INSTALL /tmp/build/perf/libbpf/include/bpf/libbpf_common.h
INSTALL /tmp/build/perf/libbpf/include/bpf/libbpf_legacy.h
INSTALL /tmp/build/perf/libbpf/include/bpf/bpf_helpers.h
INSTALL /tmp/build/perf/libbpf/include/bpf/bpf_tracing.h
INSTALL /tmp/build/perf/libbpf/include/bpf/bpf_endian.h
INSTALL /tmp/build/perf/libbpf/include/bpf/bpf_core_read.h
INSTALL libperf_headers
INSTALL /tmp/build/perf/libbpf/include/bpf/skel_internal.h
INSTALL /tmp/build/perf/libbpf/include/bpf/libbpf_version.h
INSTALL /tmp/build/perf/libbpf/include/bpf/usdt.bpf.h
INSTALL /tmp/build/perf/libbpf/include/bpf/bpf_helper_defs.h
MKDIR /tmp/build/perf/libbpf/staticobjs/
MKDIR /tmp/build/perf/libbpf/staticobjs/
INSTALL libbpf_headers
MKDIR /tmp/build/perf/libbpf/staticobjs/
MKDIR /tmp/build/perf/libbpf/staticobjs/
MKDIR /tmp/build/perf/libbpf/staticobjs/
LD /tmp/build/perf/libsymbol/libsymbol-in.o
MKDIR /tmp/build/perf/libbpf/staticobjs/
LD /tmp/build/perf/libapi/fd/libapi-in.o
MKDIR /tmp/build/perf/libbpf/staticobjs/
CC /tmp/build/perf/libbpf/staticobjs/bpf_prog_linfo.o
CC /tmp/build/perf/libbpf/staticobjs/libbpf.o
CC /tmp/build/perf/libbpf/staticobjs/bpf.o
CC /tmp/build/perf/libbpf/staticobjs/nlattr.o
CC /tmp/build/perf/libbpf/staticobjs/btf.o
CC /tmp/build/perf/libbpf/staticobjs/libbpf_errno.o
CC /tmp/build/perf/libbpf/staticobjs/str_error.o
CC /tmp/build/perf/libbpf/staticobjs/netlink.o
CC /tmp/build/perf/libbpf/staticobjs/libbpf_probes.o
CC /tmp/build/perf/libbpf/staticobjs/hashmap.o
CC /tmp/build/perf/libbpf/staticobjs/btf_dump.o
AR /tmp/build/perf/libsymbol/libsymbol.a
CC /tmp/build/perf/libbpf/staticobjs/ringbuf.o
LD /tmp/build/perf/jvmti/jvmti-in.o
CC /tmp/build/perf/libbpf/staticobjs/strset.o
CC /tmp/build/perf/libbpf/staticobjs/linker.o
CC /tmp/build/perf/libbpf/staticobjs/gen_loader.o
CC /tmp/build/perf/libbpf/staticobjs/relo_core.o
CC /tmp/build/perf/libbpf/staticobjs/usdt.o
LD /tmp/build/perf/libapi/fs/libapi-in.o
LINK /tmp/build/perf/libperf-jvmti.so
LD /tmp/build/perf/libapi/libapi-in.o
LD /tmp/build/perf/libperf/libperf-in.o
AR /tmp/build/perf/libapi/libapi.a
AR /tmp/build/perf/libperf/libperf.a
LD /tmp/build/perf/libsubcmd/libsubcmd-in.o
AR /tmp/build/perf/libsubcmd/libsubcmd.a
GEN /tmp/build/perf/python/perf.cpython-39-x86_64-linux-gnu.so

Auto-detecting system features:
... clang-bpf-co-re: [ on ]
... llvm: [ on ]
... libcap: [ on ]
... libbfd: [ on ]

MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/hashmap.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/relo_core.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_internal.h
GEN /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/bpf_helper_defs.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/btf.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_common.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_legacy.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_helpers.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_tracing.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_endian.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_core_read.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/skel_internal.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_version.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/usdt.bpf.h
INSTALL /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_helper_defs.h
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
INSTALL libbpf_headers
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
MKDIR /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf_probes.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/bpf.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/nlattr.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf_errno.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/hashmap.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/str_error.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/netlink.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/bpf_prog_linfo.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf_dump.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/ringbuf.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/strset.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/linker.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/gen_loader.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/relo_core.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/usdt.o
LD /tmp/build/perf/libbpf/staticobjs/libbpf-in.o
LINK /tmp/build/perf/libbpf/libbpf.a
LD /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf-in.o
LINK /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/libbpf/libbpf.a
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/main.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/common.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/json_writer.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/gen.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/btf.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/xlated_dumper.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/btf_dumper.o
CC /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/disasm.o
LINK /tmp/build/perf/util/bpf_skel/.tmp/bootstrap/bpftool
GEN /tmp/build/perf/util/bpf_skel/vmlinux.h
CLANG /tmp/build/perf/util/bpf_skel/.tmp/bpf_prog_profiler.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/bperf_leader.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/bperf_follower.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/bperf_cgroup.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/func_latency.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/off_cpu.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/lock_contention.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/kwork_trace.bpf.o
CLANG /tmp/build/perf/util/bpf_skel/.tmp/sample_filter.bpf.o
GENSKEL /tmp/build/perf/util/bpf_skel/bpf_prog_profiler.skel.h
GENSKEL /tmp/build/perf/util/bpf_skel/bperf_leader.skel.h
GENSKEL /tmp/build/perf/util/bpf_skel/bperf_follower.skel.h
GENSKEL /tmp/build/perf/util/bpf_skel/func_latency.skel.h
libbpf: elf: skipping unrecognized data section(7) .eh_frame
libbpf: elf: skipping unrecognized data section(8) .eh_frame
libbpf: elf: skipping unrecognized data section(8) .eh_frame
libbpf: elf: skipping unrecognized data section(9) .eh_frame
libbpf: elf: skipping relo section(12) .rel.eh_frame for section(7) .eh_frame
libbpf: elf: skipping relo section(13) .rel.eh_frame for section(8) .eh_frame
libbpf: elf: skipping relo section(14) .rel.eh_frame for section(8) .eh_frame
libbpf: elf: skipping relo section(15) .rel.eh_frame for section(9) .eh_frame
GENSKEL /tmp/build/perf/util/bpf_skel/kwork_trace.skel.h
libbpf: elf: skipping unrecognized data section(17) .eh_frame
libbpf: elf: skipping relo section(29) .rel.eh_frame for section(17) .eh_frame
GENSKEL /tmp/build/perf/util/bpf_skel/sample_filter.skel.h
libbpf: elf: skipping unrecognized data section(8) .eh_frame
libbpf: elf: skipping relo section(13) .rel.eh_frame for section(8) .eh_frame
libbpf: failed to find BTF for extern 'bpf_cast_to_kern_ctx' [21] section: -2
Error: failed to open BPF object file: No such file or directory
make[2]: *** [Makefile.perf:1085: /tmp/build/perf/util/bpf_skel/sample_filter.skel.h] Error 254
make[2]: *** Deleting file '/tmp/build/perf/util/bpf_skel/sample_filter.skel.h'
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [Makefile.perf:236: sub-make] Error 2
make: *** [Makefile:70: all] Error 2
make: Leaving directory '/git/perf-6.3.0-rc1/tools/perf'
+ exit 1
[perfbuilder@five 33]$ fg

> Thanks,
> Namhyung
>
>
> >
> > libbpf: failed to find BTF for extern 'bpf_cast_to_kern_ctx' [21] section: -2
> > Error: failed to open BPF object file: No such file or directory
> > make[2]: *** [Makefile.perf:1085: /tmp/build/perf/util/bpf_skel/sample_filter.skel.h] Error 254
> > make[2]: *** Deleting file '/tmp/build/perf/util/bpf_skel/sample_filter.skel.h'
> > make[2]: *** Waiting for unfinished jobs....
> > make[1]: *** [Makefile.perf:236: sub-make] Error 2
> > make: *** [Makefile:70: all] Error 2
> > make: Leaving directory '/git/perf-6.3.0-rc1/tools/perf'
> > + exit 1
> > [perfbuilder@five 10]$
> >
> > Works with debian:experimental:
> >
> >
> > [perfbuilder@five experimental]$ export BUILD_TARBALL=http://192.168.86.10/perf/perf-6.3.0-rc1.tar.xz
> > [perfbuilder@five experimental]$ time dm .
> > 1 147.54 debian:experimental : Ok gcc (Debian 12.2.0-14) 12.2.0 , Debian clang version 14.0.6
> > BUILD_TARBALL_HEAD=d34a77f6cd75d2a75c64e78f3d949a12903a7cf0
> >
> > Both with:
> >
> > Debian clang version 14.0.6
> > Target: x86_64-pc-linux-gnu
> > Thread model: posix
> > InstalledDir: /usr/bin
> > Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/12
> > Selected GCC installation: /usr/bin/../lib/gcc/x86_64-linux-gnu/12
> > Candidate multilib: .;@m64
> > Selected multilib: .;@m64
> > + rm -rf /tmp/build/perf
> > + mkdir /tmp/build/perf
> > + make ARCH= CROSS_COMPILE= EXTRA_CFLAGS= -C tools/perf O=/tmp/build/perf CC=clang
> >
> > and:
> >
> > COLLECT_GCC=gcc
> > COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/12/lto-wrapper
> > OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa
> > OFFLOAD_TARGET_DEFAULT=1
> > Target: x86_64-linux-gnu
> > Configured with: ../src/configure -v --with-pkgversion='Debian 12.2.0-14' --with-bugurl=file:///usr/share/doc/gcc-12/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-12 --program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --enable-cet --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none=/build/gcc-12-bTRWOB/gcc-12-12.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-12-bTRWOB/gcc-12-12.2.0/debian/tmp-gcn/usr --enable-offload-defaulted --without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
> > Thread model: posix
> > Supported LTO compression algorithms: zlib zstd
> > gcc version 12.2.0 (Debian 12.2.0-14)
> > + make ARCH= CROSS_COMPILE= EXTRA_CFLAGS= -C tools/perf O=/tmp/build/perf
> > make: Entering directory '/git/perf-6.3.0-rc1/tools/perf'
> >
> >
> > >
> > > > ---
> > > > tools/perf/Makefile.perf | 2 +-
> > > > tools/perf/util/bpf-filter.c | 64 ++++++++++
> > > > tools/perf/util/bpf-filter.h | 26 ++--
> > > > tools/perf/util/bpf_skel/sample-filter.h | 24 ++++
> > > > tools/perf/util/bpf_skel/sample_filter.bpf.c | 126 +++++++++++++++++++
> > > > tools/perf/util/evsel.h | 7 +-
> > > > 6 files changed, 236 insertions(+), 13 deletions(-)
> > > > create mode 100644 tools/perf/util/bpf_skel/sample-filter.h
> > > > create mode 100644 tools/perf/util/bpf_skel/sample_filter.bpf.c
> > > >
> > > > diff --git a/tools/perf/Makefile.perf b/tools/perf/Makefile.perf
> > > > index dc9dda09b076..ed6b6a070f79 100644
> > > > --- a/tools/perf/Makefile.perf
> > > > +++ b/tools/perf/Makefile.perf
> > > > @@ -1050,7 +1050,7 @@ SKELETONS := $(SKEL_OUT)/bpf_prog_profiler.skel.h
> > > > SKELETONS += $(SKEL_OUT)/bperf_leader.skel.h $(SKEL_OUT)/bperf_follower.skel.h
> > > > SKELETONS += $(SKEL_OUT)/bperf_cgroup.skel.h $(SKEL_OUT)/func_latency.skel.h
> > > > SKELETONS += $(SKEL_OUT)/off_cpu.skel.h $(SKEL_OUT)/lock_contention.skel.h
> > > > -SKELETONS += $(SKEL_OUT)/kwork_trace.skel.h
> > > > +SKELETONS += $(SKEL_OUT)/kwork_trace.skel.h $(SKEL_OUT)/sample_filter.skel.h
> > > >
> > > > $(SKEL_TMP_OUT) $(LIBAPI_OUTPUT) $(LIBBPF_OUTPUT) $(LIBPERF_OUTPUT) $(LIBSUBCMD_OUTPUT) $(LIBSYMBOL_OUTPUT):
> > > > $(Q)$(MKDIR) -p $@
> > > > diff --git a/tools/perf/util/bpf-filter.c b/tools/perf/util/bpf-filter.c
> > > > index c72e35d51240..f20e1bc03778 100644
> > > > --- a/tools/perf/util/bpf-filter.c
> > > > +++ b/tools/perf/util/bpf-filter.c
> > > > @@ -1,10 +1,74 @@
> > > > /* SPDX-License-Identifier: GPL-2.0 */
> > > > #include <stdlib.h>
> > > >
> > > > +#include <bpf/bpf.h>
> > > > +#include <linux/err.h>
> > > > +#include <internal/xyarray.h>
> > > > +
> > > > +#include "util/debug.h"
> > > > +#include "util/evsel.h"
> > > > +
> > > > #include "util/bpf-filter.h"
> > > > #include "util/bpf-filter-flex.h"
> > > > #include "util/bpf-filter-bison.h"
> > > >
> > > > +#include "bpf_skel/sample-filter.h"
> > > > +#include "bpf_skel/sample_filter.skel.h"
> > > > +
> > > > +#define FD(e, x, y) (*(int *)xyarray__entry(e->core.fd, x, y))
> > > > +
> > > > +int perf_bpf_filter__prepare(struct evsel *evsel)
> > > > +{
> > > > + int i, x, y, fd;
> > > > + struct sample_filter_bpf *skel;
> > > > + struct bpf_program *prog;
> > > > + struct bpf_link *link;
> > > > + struct perf_bpf_filter_expr *expr;
> > > > +
> > > > + skel = sample_filter_bpf__open_and_load();
> > > > + if (!skel) {
> > > > + pr_err("Failed to load perf sample-filter BPF skeleton\n");
> > > > + return -1;
> > > > + }
> > > > +
> > > > + i = 0;
> > > > + fd = bpf_map__fd(skel->maps.filters);
> > > > + list_for_each_entry(expr, &evsel->bpf_filters, list) {
> > > > + struct perf_bpf_filter_entry entry = {
> > > > + .op = expr->op,
> > > > + .flags = expr->sample_flags,
> > > > + .value = expr->val,
> > > > + };
> > > > + bpf_map_update_elem(fd, &i, &entry, BPF_ANY);
> > > > + i++;
> > > > + }
> > > > +
> > > > + prog = skel->progs.perf_sample_filter;
> > > > + for (x = 0; x < xyarray__max_x(evsel->core.fd); x++) {
> > > > + for (y = 0; y < xyarray__max_y(evsel->core.fd); y++) {
> > > > + link = bpf_program__attach_perf_event(prog, FD(evsel, x, y));
> > > > + if (IS_ERR(link)) {
> > > > + pr_err("Failed to attach perf sample-filter program\n");
> > > > + return PTR_ERR(link);
> > > > + }
> > > > + }
> > > > + }
> > > > + evsel->bpf_skel = skel;
> > > > + return 0;
> > > > +}
> > > > +
> > > > +int perf_bpf_filter__destroy(struct evsel *evsel)
> > > > +{
> > > > + struct perf_bpf_filter_expr *expr, *tmp;
> > > > +
> > > > + list_for_each_entry_safe(expr, tmp, &evsel->bpf_filters, list) {
> > > > + list_del(&expr->list);
> > > > + free(expr);
> > > > + }
> > > > + sample_filter_bpf__destroy(evsel->bpf_skel);
> > > > + return 0;
> > > > +}
> > > > +
> > > > struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags,
> > > > enum perf_bpf_filter_op op,
> > > > unsigned long val)
> > > > diff --git a/tools/perf/util/bpf-filter.h b/tools/perf/util/bpf-filter.h
> > > > index 93a0d3de038c..eb8e1ac43cdf 100644
> > > > --- a/tools/perf/util/bpf-filter.h
> > > > +++ b/tools/perf/util/bpf-filter.h
> > > > @@ -4,15 +4,7 @@
> > > >
> > > > #include <linux/list.h>
> > > >
> > > > -enum perf_bpf_filter_op {
> > > > - PBF_OP_EQ,
> > > > - PBF_OP_NEQ,
> > > > - PBF_OP_GT,
> > > > - PBF_OP_GE,
> > > > - PBF_OP_LT,
> > > > - PBF_OP_LE,
> > > > - PBF_OP_AND,
> > > > -};
> > > > +#include "bpf_skel/sample-filter.h"
> > > >
> > > > struct perf_bpf_filter_expr {
> > > > struct list_head list;
> > > > @@ -21,16 +13,30 @@ struct perf_bpf_filter_expr {
> > > > unsigned long val;
> > > > };
> > > >
> > > > +struct evsel;
> > > > +
> > > > #ifdef HAVE_BPF_SKEL
> > > > struct perf_bpf_filter_expr *perf_bpf_filter_expr__new(unsigned long sample_flags,
> > > > enum perf_bpf_filter_op op,
> > > > unsigned long val);
> > > > int perf_bpf_filter__parse(struct list_head *expr_head, const char *str);
> > > > +int perf_bpf_filter__prepare(struct evsel *evsel);
> > > > +int perf_bpf_filter__destroy(struct evsel *evsel);
> > > > +
> > > > #else /* !HAVE_BPF_SKEL */
> > > > +
> > > > static inline int perf_bpf_filter__parse(struct list_head *expr_head __maybe_unused,
> > > > const char *str __maybe_unused)
> > > > {
> > > > - return -ENOSYS;
> > > > + return -EOPNOTSUPP;
> > > > +}
> > > > +static inline int perf_bpf_filter__prepare(struct evsel *evsel __maybe_unused)
> > > > +{
> > > > + return -EOPNOTSUPP;
> > > > +}
> > > > +static inline int perf_bpf_filter__destroy(struct evsel *evsel __maybe_unused)
> > > > +{
> > > > + return -EOPNOTSUPP;
> > > > }
> > > > #endif /* HAVE_BPF_SKEL*/
> > > > #endif /* PERF_UTIL_BPF_FILTER_H */
> > > > diff --git a/tools/perf/util/bpf_skel/sample-filter.h b/tools/perf/util/bpf_skel/sample-filter.h
> > > > new file mode 100644
> > > > index 000000000000..862060bfda14
> > > > --- /dev/null
> > > > +++ b/tools/perf/util/bpf_skel/sample-filter.h
> > > > @@ -0,0 +1,24 @@
> > > > +#ifndef PERF_UTIL_BPF_SKEL_SAMPLE_FILTER_H
> > > > +#define PERF_UTIL_BPF_SKEL_SAMPLE_FILTER_H
> > > > +
> > > > +#define MAX_FILTERS 32
> > > > +
> > > > +/* supported filter operations */
> > > > +enum perf_bpf_filter_op {
> > > > + PBF_OP_EQ,
> > > > + PBF_OP_NEQ,
> > > > + PBF_OP_GT,
> > > > + PBF_OP_GE,
> > > > + PBF_OP_LT,
> > > > + PBF_OP_LE,
> > > > + PBF_OP_AND
> > > > +};
> > > > +
> > > > +/* BPF map entry for filtering */
> > > > +struct perf_bpf_filter_entry {
> > > > + enum perf_bpf_filter_op op;
> > > > + __u64 flags;
> > > > + __u64 value;
> > > > +};
> > > > +
> > > > +#endif /* PERF_UTIL_BPF_SKEL_SAMPLE_FILTER_H */
> > > > \ No newline at end of file
> > > > diff --git a/tools/perf/util/bpf_skel/sample_filter.bpf.c b/tools/perf/util/bpf_skel/sample_filter.bpf.c
> > > > new file mode 100644
> > > > index 000000000000..c07256279c3e
> > > > --- /dev/null
> > > > +++ b/tools/perf/util/bpf_skel/sample_filter.bpf.c
> > > > @@ -0,0 +1,126 @@
> > > > +// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > > +// Copyright (c) 2023 Google
> > > > +#include "vmlinux.h"
> > > > +#include <bpf/bpf_helpers.h>
> > > > +#include <bpf/bpf_tracing.h>
> > > > +#include <bpf/bpf_core_read.h>
> > > > +
> > > > +#include "sample-filter.h"
> > > > +
> > > > +/* BPF map that will be filled by user space */
> > > > +struct filters {
> > > > + __uint(type, BPF_MAP_TYPE_ARRAY);
> > > > + __type(key, int);
> > > > + __type(value, struct perf_bpf_filter_entry);
> > > > + __uint(max_entries, MAX_FILTERS);
> > > > +} filters SEC(".maps");
> > > > +
> > > > +int dropped;
> > > > +
> > > > +void *bpf_cast_to_kern_ctx(void *) __ksym;
> > > > +
> > > > +/* new kernel perf_sample_data definition */
> > > > +struct perf_sample_data___new {
> > > > + __u64 sample_flags;
> > > > +} __attribute__((preserve_access_index));
> > > > +
> > > > +/* helper function to return the given perf sample data */
> > > > +static inline __u64 perf_get_sample(struct bpf_perf_event_data_kern *kctx,
> > > > + struct perf_bpf_filter_entry *entry)
> > > > +{
> > > > + struct perf_sample_data___new *data = (void *)kctx->data;
> > > > +
> > > > + if (!bpf_core_field_exists(data->sample_flags) ||
> > > > + (data->sample_flags & entry->flags) == 0)
> > > > + return 0;
> > > > +
> > > > + switch (entry->flags) {
> > > > + case PERF_SAMPLE_IP:
> > > > + return kctx->data->ip;
> > > > + case PERF_SAMPLE_ID:
> > > > + return kctx->data->id;
> > > > + case PERF_SAMPLE_TID:
> > > > + return kctx->data->tid_entry.tid;
> > > > + case PERF_SAMPLE_CPU:
> > > > + return kctx->data->cpu_entry.cpu;
> > > > + case PERF_SAMPLE_TIME:
> > > > + return kctx->data->time;
> > > > + case PERF_SAMPLE_ADDR:
> > > > + return kctx->data->addr;
> > > > + case PERF_SAMPLE_PERIOD:
> > > > + return kctx->data->period;
> > > > + case PERF_SAMPLE_TRANSACTION:
> > > > + return kctx->data->txn;
> > > > + case PERF_SAMPLE_WEIGHT:
> > > > + return kctx->data->weight.full;
> > > > + case PERF_SAMPLE_PHYS_ADDR:
> > > > + return kctx->data->phys_addr;
> > > > + case PERF_SAMPLE_CODE_PAGE_SIZE:
> > > > + return kctx->data->code_page_size;
> > > > + case PERF_SAMPLE_DATA_PAGE_SIZE:
> > > > + return kctx->data->data_page_size;
> > > > + default:
> > > > + break;
> > > > + }
> > > > + return 0;
> > > > +}
> > > > +
> > > > +/* BPF program to be called from perf event overflow handler */
> > > > +SEC("perf_event")
> > > > +int perf_sample_filter(void *ctx)
> > > > +{
> > > > + struct bpf_perf_event_data_kern *kctx;
> > > > + struct perf_bpf_filter_entry *entry;
> > > > + __u64 sample_data;
> > > > + int i;
> > > > +
> > > > + kctx = bpf_cast_to_kern_ctx(ctx);
> > > > +
> > > > + for (i = 0; i < MAX_FILTERS; i++) {
> > > > + int key = i; /* needed for verifier :( */
> > > > +
> > > > + entry = bpf_map_lookup_elem(&filters, &key);
> > > > + if (entry == NULL)
> > > > + break;
> > > > + sample_data = perf_get_sample(kctx, entry);
> > > > +
> > > > + switch (entry->op) {
> > > > + case PBF_OP_EQ:
> > > > + if (!(sample_data == entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + case PBF_OP_NEQ:
> > > > + if (!(sample_data != entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + case PBF_OP_GT:
> > > > + if (!(sample_data > entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + case PBF_OP_GE:
> > > > + if (!(sample_data >= entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + case PBF_OP_LT:
> > > > + if (!(sample_data < entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + case PBF_OP_LE:
> > > > + if (!(sample_data <= entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + case PBF_OP_AND:
> > > > + if (!(sample_data & entry->value))
> > > > + goto drop;
> > > > + break;
> > > > + }
> > > > + }
> > > > + /* generate sample data */
> > > > + return 1;
> > > > +
> > > > +drop:
> > > > + __sync_fetch_and_add(&dropped, 1);
> > > > + return 0;
> > > > +}
> > > > +
> > > > +char LICENSE[] SEC("license") = "Dual BSD/GPL";
> > > > diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> > > > index c272c06565c0..68072ec655ce 100644
> > > > --- a/tools/perf/util/evsel.h
> > > > +++ b/tools/perf/util/evsel.h
> > > > @@ -150,8 +150,10 @@ struct evsel {
> > > > */
> > > > struct bpf_counter_ops *bpf_counter_ops;
> > > >
> > > > - /* for perf-stat -b */
> > > > - struct list_head bpf_counter_list;
> > > > + union {
> > > > + struct list_head bpf_counter_list; /* for perf-stat -b */
> > > > + struct list_head bpf_filters; /* for perf-record --filter */
> > > > + };
> > > >
> > > > /* for perf-stat --use-bpf */
> > > > int bperf_leader_prog_fd;
> > > > @@ -159,6 +161,7 @@ struct evsel {
> > > > union {
> > > > struct bperf_leader_bpf *leader_skel;
> > > > struct bperf_follower_bpf *follower_skel;
> > > > + void *bpf_skel;
> > > > };
> > > > unsigned long open_flags;
> > > > int precise_ip_original;
> > > > --
> > > > 2.40.0.rc1.284.g88254d51c5-goog
> > > >
> > >
> > > --
> > >
> > > - Arnaldo
> >
> > --
> >
> > - Arnaldo

--

- Arnaldo

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