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Message-ID: <Z1cdDzXe4QNJe8jL@x1>
Date: Mon, 9 Dec 2024 13:38:39 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
linux-perf-users@...r.kernel.org,
Andrii Nakryiko <andrii@...nel.org>, Song Liu <song@...nel.org>,
bpf@...r.kernel.org, Stephane Eranian <eranian@...gle.com>,
Vlastimil Babka <vbabka@...e.cz>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Hyeonggon Yoo <42.hyeyoo@...il.com>, Kees Cook <kees@...nel.org>
Subject: Re: [PATCH v2 2/4] perf lock contention: Run BPF slab cache iterator
On Mon, Dec 09, 2024 at 01:36:52PM -0300, Arnaldo Carvalho de Melo wrote:
> On Thu, Nov 07, 2024 at 10:14:57PM -0800, Namhyung Kim wrote:
> > Recently the kernel got the kmem_cache iterator to traverse metadata of
> > slab objects. This can be used to symbolize dynamic locks in a slab.
> >
> > The new slab_caches hash map will have the pointer of the kmem_cache as
> > a key and save the name and a id. The id will be saved in the flags
> > part of the lock.
>
> Trying to fix this
So you have that struct in tools/perf/util/bpf_skel/vmlinux/vmlinux.h,
but then, this kernel is old and doesn't have the kmem_cache iterator,
so using the generated vmlinux.h will fail the build.
- Arnaldo
> cd . && make GEN_VMLINUX_H=1 FEATURES_DUMP=/home/acme/git/perf-tools-next/tools/perf/BUILD_TEST_FEATURE_DUMP -j28 O=/tmp/tmp.DWo9tIFvWU DESTDIR=/tmp/tmp.ex3iljqLBT
> BUILD: Doing 'make -j28' parallel build
> 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/perf_event.h include/uapi/linux/perf_event.h
> diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
> diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h
> diff -u tools/arch/arm64/include/uapi/asm/kvm.h arch/arm64/include/uapi/asm/kvm.h
> diff -u tools/arch/arm64/include/uapi/asm/unistd.h arch/arm64/include/uapi/asm/unistd.h
> diff -u tools/include/uapi/asm-generic/unistd.h include/uapi/asm-generic/unistd.h
> diff -u tools/include/uapi/asm-generic/mman.h include/uapi/asm-generic/mman.h
> diff -u tools/perf/arch/x86/entry/syscalls/syscall_32.tbl arch/x86/entry/syscalls/syscall_32.tbl
> 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/trace/beauty/include/uapi/linux/fcntl.h include/uapi/linux/fcntl.h
> diff -u tools/perf/trace/beauty/include/uapi/linux/mount.h include/uapi/linux/mount.h
> diff -u tools/perf/trace/beauty/include/uapi/linux/prctl.h include/uapi/linux/prctl.h
> Makefile.config:989: No libllvm 13+ found, slower source file resolution, please install llvm-devel/llvm-dev
> Makefile.config:1171: No openjdk development package found, please install JDK package, e.g. openjdk-8-jdk, java-1.8.0-openjdk-devel
>
> GEN /tmp/tmp.DWo9tIFvWU/common-cmds.h
> CC /tmp/tmp.DWo9tIFvWU/dlfilters/dlfilter-test-api-v0.o
> CC /tmp/tmp.DWo9tIFvWU/dlfilters/dlfilter-test-api-v2.o
> CC /tmp/tmp.DWo9tIFvWU/dlfilters/dlfilter-show-cycles.o
> GEN /tmp/tmp.DWo9tIFvWU/arch/arm64/include/generated/asm/sysreg-defs.h
> LINK /tmp/tmp.DWo9tIFvWU/dlfilters/dlfilter-test-api-v2.so
> LINK /tmp/tmp.DWo9tIFvWU/dlfilters/dlfilter-show-cycles.so
> LINK /tmp/tmp.DWo9tIFvWU/dlfilters/dlfilter-test-api-v0.so
> PERF_VERSION = 6.13.rc1.g61c6ae4ddd41
> GEN perf-iostat
> GEN perf-archive
> INSTALL /tmp/tmp.DWo9tIFvWU/libsubcmd/include/subcmd/exec-cmd.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libsubcmd/include/subcmd/help.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libsubcmd/include/subcmd/pager.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libsubcmd/include/subcmd/parse-options.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libsubcmd/include/subcmd/run-command.h
> INSTALL libsubcmd_headers
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/bpf_perf.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/core.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/cpumap.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/threadmap.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/evlist.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/evsel.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/event.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/perf/mmap.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/core.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/cpumap.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/evlist.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libapi/include/api/cpu.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/cpumap.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libsymbol/include/symbol/kallsyms.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/evsel.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libapi/include/api/io.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libapi/include/api/debug.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/lib.h
> CC /tmp/tmp.DWo9tIFvWU/libsymbol/kallsyms.o
> CC /tmp/tmp.DWo9tIFvWU/libperf/threadmap.o
> GEN /tmp/tmp.DWo9tIFvWU/libbpf/bpf_helper_defs.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/mmap.h
> MKDIR /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf
> CC /tmp/tmp.DWo9tIFvWU/libperf/evsel.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/rc_check.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libapi/include/api/fd/array.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/threadmap.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/bpf.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/evlist.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libapi/include/api/fs/fs.h
> CC /tmp/tmp.DWo9tIFvWU/libapi/cpu.o
> INSTALL libsymbol_headers
> INSTALL /tmp/tmp.DWo9tIFvWU/libapi/include/api/fs/tracing_path.h
> MKDIR /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/libbpf.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/mmap.o
> MKDIR /tmp/tmp.DWo9tIFvWU/libapi/fd/
> INSTALL /tmp/tmp.DWo9tIFvWU/libperf/include/internal/xyarray.h
> MKDIR /tmp/tmp.DWo9tIFvWU/libapi/fs/
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/btf.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/zalloc.o
> CC /tmp/tmp.DWo9tIFvWU/libapi/debug.o
> CC /tmp/tmp.DWo9tIFvWU/libapi/fd/array.o
> CC /tmp/tmp.DWo9tIFvWU/libapi/fs/fs.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/libbpf_common.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/libbpf_legacy.h
> CC /tmp/tmp.DWo9tIFvWU/libapi/str_error_r.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/bpf_helpers.h
> MKDIR /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/
> INSTALL libperf_headers
> INSTALL libapi_headers
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/bpf_tracing.h
> CC /tmp/tmp.DWo9tIFvWU/libapi/fs/tracing_path.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/bpf_endian.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/xyarray.o
> CC /tmp/tmp.DWo9tIFvWU/libapi/fs/cgroup.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/bpf_core_read.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/skel_internal.h
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/libbpf_version.h
> CC /tmp/tmp.DWo9tIFvWU/libperf/lib.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/usdt.bpf.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/hashmap.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/relo_core.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_internal.h
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/help.o
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/exec-cmd.o
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/pager.o
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/parse-options.o
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/run-command.o
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/sigchain.o
> CC /tmp/tmp.DWo9tIFvWU/libsubcmd/subcmd-config.o
> INSTALL /tmp/tmp.DWo9tIFvWU/libbpf/include/bpf/bpf_helper_defs.h
> INSTALL libbpf_headers
> GEN /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/bpf_helper_defs.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/btf.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_common.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_legacy.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_helpers.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_tracing.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_endian.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_core_read.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/skel_internal.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/libbpf_version.h
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/usdt.bpf.h
> LD /tmp/tmp.DWo9tIFvWU/libapi/fd/libapi-in.o
> LD /tmp/tmp.DWo9tIFvWU/libsymbol/libsymbol-in.o
> AR /tmp/tmp.DWo9tIFvWU/libsymbol/libsymbol.a
> LD /tmp/tmp.DWo9tIFvWU/libapi/fs/libapi-in.o
> INSTALL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/include/bpf/bpf_helper_defs.h
> INSTALL libbpf_headers
> LD /tmp/tmp.DWo9tIFvWU/libapi/libapi-in.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/libbpf.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/bpf.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/nlattr.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/btf.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/libbpf_errno.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/str_error.o
> LD /tmp/tmp.DWo9tIFvWU/libperf/libperf-in.o
> AR /tmp/tmp.DWo9tIFvWU/libapi/libapi.a
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/netlink.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/bpf_prog_linfo.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/libbpf_probes.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/hashmap.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/btf_dump.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/ringbuf.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/strset.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/linker.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/gen_loader.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/relo_core.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/usdt.o
> AR /tmp/tmp.DWo9tIFvWU/libperf/libperf.a
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/zip.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/elf.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/features.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/btf_iter.o
> CC /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/btf_relocate.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/bpf.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/nlattr.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf_errno.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/str_error.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/netlink.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/bpf_prog_linfo.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf_probes.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/hashmap.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf_dump.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/ringbuf.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/strset.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/linker.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/gen_loader.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/relo_core.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/usdt.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/zip.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/elf.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/features.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf_iter.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/btf_relocate.o
> LD /tmp/tmp.DWo9tIFvWU/libsubcmd/libsubcmd-in.o
> AR /tmp/tmp.DWo9tIFvWU/libsubcmd/libsubcmd.a
> LD /tmp/tmp.DWo9tIFvWU/libbpf/staticobjs/libbpf-in.o
> LINK /tmp/tmp.DWo9tIFvWU/libbpf/libbpf.a
> LD /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/staticobjs/libbpf-in.o
> LINK /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/libbpf/libbpf.a
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/main.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/common.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/json_writer.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/gen.o
> CC /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/btf.o
> LINK /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bootstrap/bpftool
> GEN /tmp/tmp.DWo9tIFvWU/util/bpf_skel/vmlinux.h
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bpf_prog_profiler.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bperf_leader.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bperf_follower.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bperf_cgroup.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/func_latency.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/off_cpu.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/lock_contention.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/kwork_trace.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/sample_filter.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/kwork_top.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/bench_uprobe.bpf.o
> CLANG /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/augmented_raw_syscalls.bpf.o
> GENSKEL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/bench_uprobe.skel.h
> GENSKEL /tmp/tmp.DWo9tIFvWU/util/bpf_skel/func_latency.skel.h
> util/bpf_skel/lock_contention.bpf.c:612:28: error: declaration of 'struct bpf_iter__kmem_cache' will not be visible outside of this function [-Werror,-Wvisibility]
> 612 | int slab_cache_iter(struct bpf_iter__kmem_cache *ctx)
> | ^
> util/bpf_skel/lock_contention.bpf.c:614:28: error: incomplete definition of type 'struct bpf_iter__kmem_cache'
> 614 | struct kmem_cache *s = ctx->s;
> | ~~~^
> util/bpf_skel/lock_contention.bpf.c:612:28: note: forward declaration of 'struct bpf_iter__kmem_cache'
> 612 | int slab_cache_iter(struct bpf_iter__kmem_cache *ctx)
> | ^
> 2 errors generated.
> make[4]: *** [Makefile.perf:1248: /tmp/tmp.DWo9tIFvWU/util/bpf_skel/.tmp/lock_contention.bpf.o] Error 1
> make[4]: *** Waiting for unfinished jobs....
> make[3]: *** [Makefile.perf:292: sub-make] Error 2
> make[2]: *** [Makefile:76: all] Error 2
> make[1]: *** [tests/make:344: make_gen_vmlinux_h_O] Error 1
> make: *** [Makefile:109: build-test] Error 2
> make: Leaving directory '/home/acme/git/perf-tools-next/tools/perf'
>
> real 3m43.896s
> user 29m30.716s
> sys 6m36.609s
> ⬢ [acme@...lbox perf-tools-next]$
>
>
>
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> > tools/perf/util/bpf_lock_contention.c | 50 +++++++++++++++++++
> > .../perf/util/bpf_skel/lock_contention.bpf.c | 28 +++++++++++
> > tools/perf/util/bpf_skel/lock_data.h | 12 +++++
> > tools/perf/util/bpf_skel/vmlinux/vmlinux.h | 8 +++
> > 4 files changed, 98 insertions(+)
> >
> > diff --git a/tools/perf/util/bpf_lock_contention.c b/tools/perf/util/bpf_lock_contention.c
> > index 41a1ad08789511c3..558590c3111390fc 100644
> > --- a/tools/perf/util/bpf_lock_contention.c
> > +++ b/tools/perf/util/bpf_lock_contention.c
> > @@ -12,12 +12,59 @@
> > #include <linux/zalloc.h>
> > #include <linux/string.h>
> > #include <bpf/bpf.h>
> > +#include <bpf/btf.h>
> > #include <inttypes.h>
> >
> > #include "bpf_skel/lock_contention.skel.h"
> > #include "bpf_skel/lock_data.h"
> >
> > static struct lock_contention_bpf *skel;
> > +static bool has_slab_iter;
> > +
> > +static void check_slab_cache_iter(struct lock_contention *con)
> > +{
> > + struct btf *btf = btf__load_vmlinux_btf();
> > + s32 ret;
> > +
> > + if (btf == NULL) {
> > + pr_debug("BTF loading failed: %s\n", strerror(errno));
> > + return;
> > + }
> > +
> > + ret = btf__find_by_name_kind(btf, "bpf_iter__kmem_cache", BTF_KIND_STRUCT);
> > + if (ret < 0) {
> > + bpf_program__set_autoload(skel->progs.slab_cache_iter, false);
> > + pr_debug("slab cache iterator is not available: %d\n", ret);
> > + goto out;
> > + }
> > +
> > + has_slab_iter = true;
> > +
> > + bpf_map__set_max_entries(skel->maps.slab_caches, con->map_nr_entries);
> > +out:
> > + btf__free(btf);
> > +}
> > +
> > +static void run_slab_cache_iter(void)
> > +{
> > + int fd;
> > + char buf[256];
> > +
> > + if (!has_slab_iter)
> > + return;
> > +
> > + fd = bpf_iter_create(bpf_link__fd(skel->links.slab_cache_iter));
> > + if (fd < 0) {
> > + pr_debug("cannot create slab cache iter: %d\n", fd);
> > + return;
> > + }
> > +
> > + /* This will run the bpf program */
> > + while (read(fd, buf, sizeof(buf)) > 0)
> > + continue;
> > +
> > + close(fd);
> > +}
> >
> > int lock_contention_prepare(struct lock_contention *con)
> > {
> > @@ -109,6 +156,8 @@ int lock_contention_prepare(struct lock_contention *con)
> > skel->rodata->use_cgroup_v2 = 1;
> > }
> >
> > + check_slab_cache_iter(con);
> > +
> > if (lock_contention_bpf__load(skel) < 0) {
> > pr_err("Failed to load lock-contention BPF skeleton\n");
> > return -1;
> > @@ -304,6 +353,7 @@ static void account_end_timestamp(struct lock_contention *con)
> >
> > int lock_contention_start(void)
> > {
> > + run_slab_cache_iter();
> > skel->bss->enabled = 1;
> > return 0;
> > }
> > diff --git a/tools/perf/util/bpf_skel/lock_contention.bpf.c b/tools/perf/util/bpf_skel/lock_contention.bpf.c
> > index 1069bda5d733887f..fd24ccb00faec0ba 100644
> > --- a/tools/perf/util/bpf_skel/lock_contention.bpf.c
> > +++ b/tools/perf/util/bpf_skel/lock_contention.bpf.c
> > @@ -100,6 +100,13 @@ struct {
> > __uint(max_entries, 1);
> > } cgroup_filter SEC(".maps");
> >
> > +struct {
> > + __uint(type, BPF_MAP_TYPE_HASH);
> > + __uint(key_size, sizeof(long));
> > + __uint(value_size, sizeof(struct slab_cache_data));
> > + __uint(max_entries, 1);
> > +} slab_caches SEC(".maps");
> > +
> > struct rw_semaphore___old {
> > struct task_struct *owner;
> > } __attribute__((preserve_access_index));
> > @@ -136,6 +143,8 @@ int perf_subsys_id = -1;
> >
> > __u64 end_ts;
> >
> > +__u32 slab_cache_id;
> > +
> > /* error stat */
> > int task_fail;
> > int stack_fail;
> > @@ -563,4 +572,23 @@ int BPF_PROG(end_timestamp)
> > return 0;
> > }
> >
> > +SEC("iter/kmem_cache")
> > +int slab_cache_iter(struct bpf_iter__kmem_cache *ctx)
> > +{
> > + struct kmem_cache *s = ctx->s;
> > + struct slab_cache_data d;
> > +
> > + if (s == NULL)
> > + return 0;
> > +
> > + d.id = ++slab_cache_id << LCB_F_SLAB_ID_SHIFT;
> > + bpf_probe_read_kernel_str(d.name, sizeof(d.name), s->name);
> > +
> > + if (d.id >= LCB_F_SLAB_ID_END)
> > + return 0;
> > +
> > + bpf_map_update_elem(&slab_caches, &s, &d, BPF_NOEXIST);
> > + return 0;
> > +}
> > +
> > char LICENSE[] SEC("license") = "Dual BSD/GPL";
> > diff --git a/tools/perf/util/bpf_skel/lock_data.h b/tools/perf/util/bpf_skel/lock_data.h
> > index 4f0aae5483745dfa..c15f734d7fc4aecb 100644
> > --- a/tools/perf/util/bpf_skel/lock_data.h
> > +++ b/tools/perf/util/bpf_skel/lock_data.h
> > @@ -32,9 +32,16 @@ struct contention_task_data {
> > #define LCD_F_MMAP_LOCK (1U << 31)
> > #define LCD_F_SIGHAND_LOCK (1U << 30)
> >
> > +#define LCB_F_SLAB_ID_SHIFT 16
> > +#define LCB_F_SLAB_ID_START (1U << 16)
> > +#define LCB_F_SLAB_ID_END (1U << 26)
> > +#define LCB_F_SLAB_ID_MASK 0x03FF0000U
> > +
> > #define LCB_F_TYPE_MAX (1U << 7)
> > #define LCB_F_TYPE_MASK 0x0000007FU
> >
> > +#define SLAB_NAME_MAX 28
> > +
> > struct contention_data {
> > u64 total_time;
> > u64 min_time;
> > @@ -55,4 +62,9 @@ enum lock_class_sym {
> > LOCK_CLASS_RQLOCK,
> > };
> >
> > +struct slab_cache_data {
> > + u32 id;
> > + char name[SLAB_NAME_MAX];
> > +};
> > +
> > #endif /* UTIL_BPF_SKEL_LOCK_DATA_H */
> > diff --git a/tools/perf/util/bpf_skel/vmlinux/vmlinux.h b/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
> > index 4dcad7b682bdee9c..7b81d3173917fdb5 100644
> > --- a/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
> > +++ b/tools/perf/util/bpf_skel/vmlinux/vmlinux.h
> > @@ -195,4 +195,12 @@ struct bpf_perf_event_data_kern {
> > */
> > struct rq {};
> >
> > +struct kmem_cache {
> > + const char *name;
> > +} __attribute__((preserve_access_index));
> > +
> > +struct bpf_iter__kmem_cache {
> > + struct kmem_cache *s;
> > +} __attribute__((preserve_access_index));
> > +
> > #endif // __VMLINUX_H
> > --
> > 2.47.0.277.g8800431eea-goog
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