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Message-ID: <YN4CZbkN5ZrKHXo/@kernel.org>
Date: Thu, 1 Jul 2021 14:59:01 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Andi Kleen <ak@...ux.intel.com>,
Ian Rogers <irogers@...gle.com>,
Stephane Eranian <eranian@...gle.com>,
Song Liu <songliubraving@...com>
Subject: Re: [PATCH 1/4] perf tools: Add read_cgroup_id() function
Em Fri, Jun 25, 2021 at 12:18:23AM -0700, Namhyung Kim escreveu:
> The read_cgroup_id() is to read a cgroup id from a file handle using
> name_to_handle_at(2) for the given cgroup. It'll be used by bperf
> cgroup stat later.
>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
> tools/perf/util/cgroup.c | 25 +++++++++++++++++++++++++
> tools/perf/util/cgroup.h | 9 +++++++++
> 2 files changed, 34 insertions(+)
>
> diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
> index f24ab4585553..ef18c988c681 100644
> --- a/tools/perf/util/cgroup.c
> +++ b/tools/perf/util/cgroup.c
> @@ -45,6 +45,31 @@ static int open_cgroup(const char *name)
> return fd;
> }
>
> +#ifdef HAVE_FILE_HANDLE
> +int read_cgroup_id(struct cgroup *cgrp)
> +{
> + char path[PATH_MAX + 1];
> + char mnt[PATH_MAX + 1];
> + struct {
> + struct file_handle fh;
> + uint64_t cgroup_id;
> + } handle;
> + int mount_id;
> +
> + if (cgroupfs_find_mountpoint(mnt, PATH_MAX + 1, "perf_event"))
> + return -1;
> +
> + scnprintf(path, PATH_MAX, "%s/%s", mnt, cgrp->name);
> +
> + handle.fh.handle_bytes = sizeof(handle.cgroup_id);
> + if (name_to_handle_at(AT_FDCWD, path, &handle.fh, &mount_id, 0) < 0)
> + return -1;
> +
> + cgrp->id = handle.cgroup_id;
> + return 0;
> +}
> +#endif /* HAVE_FILE_HANDLE */
> +
> static struct cgroup *evlist__find_cgroup(struct evlist *evlist, const char *str)
> {
> struct evsel *counter;
> diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
> index 162906f3412a..707adbe25123 100644
> --- a/tools/perf/util/cgroup.h
> +++ b/tools/perf/util/cgroup.h
> @@ -38,4 +38,13 @@ struct cgroup *cgroup__find(struct perf_env *env, uint64_t id);
>
> void perf_env__purge_cgroups(struct perf_env *env);
>
> +#ifdef HAVE_FILE_HANDLE
> +int read_cgroup_id(struct cgroup *cgrp);
> +#else
> +int read_cgroup_id(struct cgroup *cgrp)
> +{
> + return -1;
> +}
> +#endif /* HAVE_FILE_HANDLE */
> +
> #endif /* __CGROUP_H__ */
> --
> 2.32.0.93.g670b81a890-goog
>
You forgot the __maybe_unused in the !HAVE_FILE_HANDLE case, also the
static inline for functions defined in headers, I'm fixing this up:
Alpine clang version 8.0.0 (tags/RELEASE_800/final) (based on LLVM 8.0.0)
Target: x86_64-alpine-linux-musl
Thread model: posix
InstalledDir: /usr/bin
Found candidate GCC installation: /usr/bin/../lib/gcc/x86_64-alpine-linux-musl/8.3.0
Found candidate GCC installation: /usr/lib/gcc/x86_64-alpine-linux-musl/8.3.0
Selected GCC installation: /usr/bin/../lib/gcc/x86_64-alpine-linux-musl/8.3.0
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'
make: Entering directory '/git/perf-5.13.0/tools/perf'
BUILD: Doing 'make -j24' parallel build
HOSTCC /tmp/build/perf/fixdep.o
HOSTLD /tmp/build/perf/fixdep-in.o
LINK /tmp/build/perf/fixdep
Makefile.config:439: No libdw DWARF unwind found, Please install elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR
Makefile.config:444: No libdw.h found or old libdw.h found or elfutils is older than 0.138, disables dwarf support. Please install new elfutils-devel/libdw-dev
Makefile.config:563: DWARF support is off, BPF prologue is disabled
Makefile.config:571: No sys/sdt.h found, no SDT events are defined, please install systemtap-sdt-devel or systemtap-sdt-dev
Makefile.config:998: No libbabeltrace found, disables 'perf data' CTF format support, please install libbabeltrace-dev[el]/libbabeltrace-ctf-dev
Makefile.config:1024: No alternatives command found, you need to set JDIR= to point to the root of your Java directory
Auto-detecting system features:
... dwarf: [ OFF ]
... dwarf_getlocations: [ OFF ]
... glibc: [ OFF ]
... 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: [ OFF ]
... zlib: [ on ]
... lzma: [ on ]
... get_cpuid: [ on ]
... bpf: [ on ]
... libaio: [ on ]
... libzstd: [ on ]
... disassembler-four-args: [ on ]
GEN /tmp/build/perf/common-cmds.h
PERF_VERSION = 5.13.gfdf19665b1fb
MKDIR /tmp/build/perf/pmu-events/
MKDIR /tmp/build/perf/pmu-events/
MKDIR /tmp/build/perf/pmu-events/
HOSTCC /tmp/build/perf/pmu-events/json.o
HOSTCC /tmp/build/perf/pmu-events/jsmn.o
HOSTCC /tmp/build/perf/pmu-events/jevents.o
GEN perf-archive
GEN perf-with-kcore
GEN perf-iostat
CC /tmp/build/perf/exec-cmd.o
CC /tmp/build/perf/help.o
CC /tmp/build/perf/pager.o
CC /tmp/build/perf/parse-options.o
CC /tmp/build/perf/run-command.o
CC /tmp/build/perf/sigchain.o
CC /tmp/build/perf/subcmd-config.o
CC /tmp/build/perf/cpu.o
CC /tmp/build/perf/debug.o
MKDIR /tmp/build/perf/fd/
MKDIR /tmp/build/perf/fs/
CC /tmp/build/perf/str_error_r.o
MKDIR /tmp/build/perf/fs/
CC /tmp/build/perf/fd/array.o
MKDIR /tmp/build/perf/fs/
CC /tmp/build/perf/fs/fs.o
CC /tmp/build/perf/fs/tracing_path.o
CC /tmp/build/perf/fs/cgroup.o
CC /tmp/build/perf/event-parse.o
CC /tmp/build/perf/event-plugin.o
CC /tmp/build/perf/trace-seq.o
CC /tmp/build/perf/parse-filter.o
CC /tmp/build/perf/parse-utils.o
CC /tmp/build/perf/kbuffer-parse.o
CC /tmp/build/perf/core.o
CC /tmp/build/perf/cpumap.o
GEN /tmp/build/perf/bpf_helper_defs.h
CC /tmp/build/perf/threadmap.o
CC /tmp/build/perf/evsel.o
LD /tmp/build/perf/fd/libapi-in.o
CC /tmp/build/perf/tep_strerror.o
CC /tmp/build/perf/plugin_jbd2.o
CC /tmp/build/perf/plugin_hrtimer.o
CC /tmp/build/perf/event-parse-api.o
HOSTLD /tmp/build/perf/pmu-events/jevents-in.o
CC /tmp/build/perf/plugin_kvm.o
CC /tmp/build/perf/plugin_kmem.o
LINK /tmp/build/perf/pmu-events/jevents
CC /tmp/build/perf/evlist.o
CC /tmp/build/perf/mmap.o
LD /tmp/build/perf/fs/libapi-in.o
CC /tmp/build/perf/plugin_mac80211.o
GEN /tmp/build/perf/pmu-events/pmu-events.c
CC /tmp/build/perf/zalloc.o
LD /tmp/build/perf/libapi-in.o
AR /tmp/build/perf/libapi.a
CC /tmp/build/perf/xyarray.o
CC /tmp/build/perf/lib.o
CC /tmp/build/perf/plugin_sched_switch.o
LD /tmp/build/perf/plugin_kmem-in.o
LD /tmp/build/perf/plugin_jbd2-in.o
CC /tmp/build/perf/plugin_function.o
LD /tmp/build/perf/plugin_hrtimer-in.o
CC /tmp/build/perf/plugin_futex.o
CC /tmp/build/perf/plugin_scsi.o
CC /tmp/build/perf/plugin_cfg80211.o
LD /tmp/build/perf/plugin_kvm-in.o
MKDIR /tmp/build/perf/staticobjs/
CC /tmp/build/perf/staticobjs/libbpf.o
CC /tmp/build/perf/plugin_xen.o
MKDIR /tmp/build/perf/staticobjs/
CC /tmp/build/perf/staticobjs/bpf.o
CC /tmp/build/perf/plugin_tlb.o
CC /tmp/build/perf/staticobjs/nlattr.o
CC /tmp/build/perf/staticobjs/btf.o
LD /tmp/build/perf/plugin_mac80211-in.o
CC /tmp/build/perf/staticobjs/libbpf_errno.o
CC /tmp/build/perf/staticobjs/str_error.o
LD /tmp/build/perf/plugin_sched_switch-in.o
LINK /tmp/build/perf/plugin_jbd2.so
CC /tmp/build/perf/staticobjs/netlink.o
CC /tmp/build/perf/staticobjs/bpf_prog_linfo.o
CC /tmp/build/perf/staticobjs/libbpf_probes.o
LD /tmp/build/perf/plugin_function-in.o
LD /tmp/build/perf/plugin_cfg80211-in.o
LD /tmp/build/perf/plugin_futex-in.o
LD /tmp/build/perf/plugin_xen-in.o
LINK /tmp/build/perf/plugin_hrtimer.so
LINK /tmp/build/perf/plugin_kmem.so
LD /tmp/build/perf/plugin_scsi-in.o
LINK /tmp/build/perf/plugin_kvm.so
LINK /tmp/build/perf/plugin_mac80211.so
LINK /tmp/build/perf/plugin_sched_switch.so
LD /tmp/build/perf/plugin_tlb-in.o
LINK /tmp/build/perf/plugin_futex.so
LINK /tmp/build/perf/plugin_function.so
CC /tmp/build/perf/staticobjs/xsk.o
CC /tmp/build/perf/staticobjs/hashmap.o
LINK /tmp/build/perf/plugin_xen.so
LINK /tmp/build/perf/plugin_scsi.so
CC /tmp/build/perf/staticobjs/btf_dump.o
LINK /tmp/build/perf/plugin_tlb.so
LINK /tmp/build/perf/plugin_cfg80211.so
CC /tmp/build/perf/staticobjs/ringbuf.o
CC /tmp/build/perf/staticobjs/strset.o
CC /tmp/build/perf/staticobjs/linker.o
GEN /tmp/build/perf/libtraceevent-dynamic-list
CC /tmp/build/perf/pmu-events/pmu-events.o
LD /tmp/build/perf/libsubcmd-in.o
AR /tmp/build/perf/libsubcmd.a
LD /tmp/build/perf/libperf-in.o
AR /tmp/build/perf/libperf.a
LD /tmp/build/perf/libtraceevent-in.o
LINK /tmp/build/perf/libtraceevent.a
GEN /tmp/build/perf/python/perf.so
CC /tmp/build/perf/builtin-bench.o
CC /tmp/build/perf/builtin-annotate.o
CC /tmp/build/perf/builtin-config.o
CC /tmp/build/perf/builtin-diff.o
CC /tmp/build/perf/builtin-evlist.o
CC /tmp/build/perf/builtin-ftrace.o
CC /tmp/build/perf/builtin-help.o
CC /tmp/build/perf/builtin-sched.o
CC /tmp/build/perf/builtin-buildid-list.o
CC /tmp/build/perf/builtin-buildid-cache.o
CC /tmp/build/perf/builtin-kallsyms.o
CC /tmp/build/perf/builtin-list.o
CC /tmp/build/perf/builtin-record.o
CC /tmp/build/perf/builtin-report.o
CC /tmp/build/perf/builtin-stat.o
CC /tmp/build/perf/builtin-timechart.o
CC /tmp/build/perf/builtin-top.o
CC /tmp/build/perf/builtin-script.o
CC /tmp/build/perf/builtin-kmem.o
In file included from builtin-top.c:25:
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:35: error: unused parameter 'cgrp' [-Werror,-Wunused-parameter]
int read_cgroup_id(struct cgroup *cgrp)
^
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:5: error: no previous prototype for function 'read_cgroup_id' [-Werror,-Wmissing-prototypes]
int read_cgroup_id(struct cgroup *cgrp)
^
In file included from builtin-stat.c:45:
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:35: error: unused parameter 'cgrp' [-Werror,-Wunused-parameter]
int read_cgroup_id(struct cgroup *cgrp)
^
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:5: error: no previous prototype for function 'read_cgroup_id' [-Werror,-Wmissing-prototypes]
int read_cgroup_id(struct cgroup *cgrp)
^
In file included from builtin-record.c:17:
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:35: error: unused parameter 'cgrp' [-Werror,-Wunused-parameter]
int read_cgroup_id(struct cgroup *cgrp)
^
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:5: error: no previous prototype for function 'read_cgroup_id' [-Werror,-Wmissing-prototypes]
int read_cgroup_id(struct cgroup *cgrp)
^
CC /tmp/build/perf/builtin-lock.o
CC /tmp/build/perf/builtin-kvm.o
CC /tmp/build/perf/builtin-mem.o
CC /tmp/build/perf/builtin-data.o
CC /tmp/build/perf/builtin-version.o
CC /tmp/build/perf/builtin-inject.o
2 errors generated.
make[3]: *** [/git/perf-5.13.0/tools/build/Makefile.build:97: /tmp/build/perf/builtin-record.o] Error 1
make[3]: *** Waiting for unfinished jobs....
2 errors generated.
make[3]: *** [/git/perf-5.13.0/tools/build/Makefile.build:97: /tmp/build/perf/builtin-top.o] Error 1
2 errors generated.
make[3]: *** [/git/perf-5.13.0/tools/build/Makefile.build:97: /tmp/build/perf/builtin-stat.o] Error 1
LD /tmp/build/perf/pmu-events/pmu-events-in.o
In file included from /git/perf-5.13.0/tools/perf/util/evsel.c:30:
/git/perf-5.13.0/tools/perf/util/cgroup.h:44:5: error: no previous prototype for function 'read_cgroup_id' [-Werror,-Wmissing-prototypes]
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