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Date: Thu, 7 Sep 2023 14:31:29 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Aditya Gupta <adityag@...ux.ibm.com>
Cc: acme@...nel.org, jolsa@...nel.org, irogers@...gle.com,
linux-perf-users@...r.kernel.org, maddy@...ux.ibm.com,
atrajeev@...ux.vnet.ibm.com, kjain@...ux.ibm.com,
disgoel@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] perf check: introduce check subcommand
Hello,
On Sun, Sep 3, 2023 at 4:47 AM Aditya Gupta <adityag@...ux.ibm.com> wrote:
>
> Currently the presence of a feature is checked with a combination of
> perf version --build-options and greps, such as:
>
> perf version --build-options | grep " on .* HAVE_FEATURE"
>
> Instead of this, introduce a subcommand "perf check --feature", with which
> scripts can test for presence of a feature, such as:
>
> perf check --feature HAVE_FEATURE
>
> 'perf check --feature' command is expected to have exit status of 1 if feature is
> built-in, and 0 if not, -2 if feature is not known.
>
> A global array 'supported_features' has also been introduced that can be
> used by other commands like 'perf version --build-options', so that
> new features can be added in one place, with the array
>
> Signed-off-by: Aditya Gupta <adityag@...ux.ibm.com>
> ---
> tools/perf/Build | 1 +
> tools/perf/Documentation/perf-check.txt | 53 ++++++++++++++
> tools/perf/builtin-check.c | 95 +++++++++++++++++++++++++
> tools/perf/builtin.h | 47 ++++++++++++
> tools/perf/perf.c | 1 +
> 5 files changed, 197 insertions(+)
> create mode 100644 tools/perf/Documentation/perf-check.txt
> create mode 100644 tools/perf/builtin-check.c
>
> diff --git a/tools/perf/Build b/tools/perf/Build
> index aa7623622834..a55a797c1b5f 100644
> --- a/tools/perf/Build
> +++ b/tools/perf/Build
> @@ -1,5 +1,6 @@
> perf-y += builtin-bench.o
> perf-y += builtin-annotate.o
> +perf-y += builtin-check.o
> perf-y += builtin-config.o
> perf-y += builtin-diff.o
> perf-y += builtin-evlist.o
> diff --git a/tools/perf/Documentation/perf-check.txt b/tools/perf/Documentation/perf-check.txt
> new file mode 100644
> index 000000000000..ee4331838be5
> --- /dev/null
> +++ b/tools/perf/Documentation/perf-check.txt
> @@ -0,0 +1,53 @@
> +perf-check(1)
> +===============
> +
> +NAME
> +----
> +perf-check - check features in perf
> +
> +SYNOPSIS
> +--------
> +'perf check' [--feature]
> +
> +DESCRIPTION
> +-----------
> +With no options given, the 'perf check' just prints the perf version
> +on the standard output.
> +
> +If the option '--feature' is given, then status of feature is printed
> +on the standard output, ie. whether it is compiled-in/built-in or not
> +
> +OPTIONS
> +-------
> +--feature::
> + Print whether a feature is compiled-in or not. A feature name/macro is
> + required to be passed after this flag
> +
> + Example Usage:
> + perf check --feature libtraceevent
> + perf check --feature HAVE_LIBTRACEEVENT
> +
> + Supported feature names/macro:
> + dwarf / HAVE_DWARF_SUPPORT
> + dwarf_getlocations / HAVE_DWARF_GETLOCATIONS_SUPPORT
> + libaudit / HAVE_LIBAUDIT_SUPPORT
> + syscall_table / HAVE_SYSCALL_TABLE_SUPPORT
> + libbfd / HAVE_LIBBFD_SUPPORT
> + debuginfod / HAVE_DEBUGINFOD_SUPPORT
> + libelf / HAVE_LIBELF_SUPPORT
> + libnuma / HAVE_LIBNUMA_SUPPORT
> + numa_num_possible_cpus / HAVE_LIBNUMA_SUPPORT
> + libperl / HAVE_LIBPERL_SUPPORT
> + libpython / HAVE_LIBPYTHON_SUPPORT
> + libslang / HAVE_SLANG_SUPPORT
> + libcrypto / HAVE_LIBCRYPTO_SUPPORT
> + libunwind / HAVE_LIBUNWIND_SUPPORT
> + libdw-dwarf-unwind / HAVE_DWARF_SUPPORT
> + zlib / HAVE_ZLIB_SUPPORT
> + lzma / HAVE_LZMA_SUPPORT
> + get_cpuid / HAVE_AUXTRACE_SUPPORT
> + bpf / HAVE_LIBBPF_SUPPORT
> + aio / HAVE_AIO_SUPPORT
> + zstd / HAVE_ZSTD_SUPPORT
> + libpfm4 / HAVE_LIBPFM
> + libtraceevent / HAVE_LIBTRACEEVENT
> diff --git a/tools/perf/builtin-check.c b/tools/perf/builtin-check.c
> new file mode 100644
> index 000000000000..3dee72426c30
> --- /dev/null
> +++ b/tools/perf/builtin-check.c
> @@ -0,0 +1,95 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include "builtin.h"
> +#include "color.h"
> +#include "util/debug.h"
> +#include "util/header.h"
> +#include <tools/config.h>
> +#include <stdbool.h>
> +#include <stdio.h>
> +#include <string.h>
> +#include <subcmd/parse-options.h>
> +
> +struct check {
> + const char *feature;
> +};
> +
> +static struct check check;
> +
> +static struct option check_options[] = {
> + OPT_STRING(0, "feature", &check.feature, NULL, "check if a feature is built in"),
> + OPT_END(),
> +};
> +
> +static const char * const check_usage[] = {
> + "perf check [<options>]",
> + NULL
> +};
> +
> +static void on_off_print(const char *status)
> +{
> + printf("[ ");
> +
> + if (!strcmp(status, "OFF"))
> + color_fprintf(stdout, PERF_COLOR_RED, "%-3s", status);
> + else
> + color_fprintf(stdout, PERF_COLOR_GREEN, "%-3s", status);
> +
> + printf(" ]");
> +}
> +
> +static void status_print(const char *name, const char *macro,
> + const char *status)
> +{
> + printf("%22s: ", name);
> + on_off_print(status);
> + printf(" # %s\n", macro);
> +}
> +
> +#define STATUS(feature) \
> +do { \
> + if (feature.is_builtin) \
> + status_print(feature.name, feature.macro, "on"); \
> + else \
> + status_print(feature.name, feature.macro, "OFF"); \
> +} while (0)
> +
> +/**
> + * check whether "feature" is built-in with perf
> + * returns:./perf annotate --data-type --type-stat -k vmlinux -d '[kernel.kallsyms]' --objdump=llvm-objdump
> + * -1: Feature not known
> + * 0: Built-in
> + * 1: NOT Built in
> + */
> +static int has_support(const char *feature)
> +{
> + int res = -1;
> +
> + for (int i = 0; supported_features[i].name; ++i) {
> + if ((strcmp(feature, supported_features[i].name) == 0) ||
> + (strcmp(feature, supported_features[i].macro) == 0)) {
> + res = supported_features[i].is_builtin;
> + STATUS(supported_features[i]);
> + break;
> + }
> + }
> +
> + if (res == -1) {
> + color_fprintf(stdout, PERF_COLOR_RED, "Feature not known: %s", feature);
> + return -2;
return -1 ?? It doesn't match with the comment.
> + }
> +
> + return !res;
> +}
> +
> +int cmd_check(int argc, const char **argv)
> +{
> + argc = parse_options(argc, argv, check_options, check_usage,
> + PARSE_OPT_STOP_AT_NON_OPTION);
> +
> + printf("perf check %s\n", perf_version_string);
> +
> + if (check.feature)
> + return has_support(check.feature);
> +
> + return 0;
> +}
> diff --git a/tools/perf/builtin.h b/tools/perf/builtin.h
> index f2ab5bae2150..6683ea6d3b60 100644
> --- a/tools/perf/builtin.h
> +++ b/tools/perf/builtin.h
> @@ -2,6 +2,52 @@
> #ifndef BUILTIN_H
> #define BUILTIN_H
>
> +#include <stddef.h>
> +#include <linux/compiler.h>
> +#include <tools/config.h>
> +
> +struct feature_support {
> + const char *name;
> + const char *macro;
> + int is_builtin;
> +};
> +
> +#define FEATURE_SUPPORT(name_, macro_) { \
> + .name = name_, \
> + .macro = #macro_, \
> + .is_builtin = IS_BUILTIN(macro_) }
> +
> +static struct feature_support supported_features[] __maybe_unused = {
Hmm.. do you want it in a header file?
I'm afraid it'd duplicate the entire array for any .c files that
include this header.
> + FEATURE_SUPPORT("dwarf", HAVE_DWARF_SUPPORT),
> + FEATURE_SUPPORT("dwarf_getlocations", HAVE_DWARF_GETLOCATIONS_SUPPORT),
> +#ifndef HAVE_SYSCALL_TABLE_SUPPORT
Do we really need this #ifndef?
Thanks,
Namhyung
> + FEATURE_SUPPORT("libaudit", HAVE_LIBAUDIT_SUPPORT),
> +#endif
> + FEATURE_SUPPORT("syscall_table", HAVE_SYSCALL_TABLE_SUPPORT),
> + FEATURE_SUPPORT("libbfd", HAVE_LIBBFD_SUPPORT),
> + FEATURE_SUPPORT("debuginfod", HAVE_DEBUGINFOD_SUPPORT),
> + FEATURE_SUPPORT("libelf", HAVE_LIBELF_SUPPORT),
> + FEATURE_SUPPORT("libnuma", HAVE_LIBNUMA_SUPPORT),
> + FEATURE_SUPPORT("numa_num_possible_cpus", HAVE_LIBNUMA_SUPPORT),
> + FEATURE_SUPPORT("libperl", HAVE_LIBPERL_SUPPORT),
> + FEATURE_SUPPORT("libpython", HAVE_LIBPYTHON_SUPPORT),
> + FEATURE_SUPPORT("libslang", HAVE_SLANG_SUPPORT),
> + FEATURE_SUPPORT("libcrypto", HAVE_LIBCRYPTO_SUPPORT),
> + FEATURE_SUPPORT("libunwind", HAVE_LIBUNWIND_SUPPORT),
> + FEATURE_SUPPORT("libdw-dwarf-unwind", HAVE_DWARF_SUPPORT),
> + FEATURE_SUPPORT("zlib", HAVE_ZLIB_SUPPORT),
> + FEATURE_SUPPORT("lzma", HAVE_LZMA_SUPPORT),
> + FEATURE_SUPPORT("get_cpuid", HAVE_AUXTRACE_SUPPORT),
> + FEATURE_SUPPORT("bpf", HAVE_LIBBPF_SUPPORT),
> + FEATURE_SUPPORT("aio", HAVE_AIO_SUPPORT),
> + FEATURE_SUPPORT("zstd", HAVE_ZSTD_SUPPORT),
> + FEATURE_SUPPORT("libpfm4", HAVE_LIBPFM),
> + FEATURE_SUPPORT("libtraceevent", HAVE_LIBTRACEEVENT),
> +
> + // this should remain at end, to know the array end
> + FEATURE_SUPPORT(NULL, _)
> +};
> +
> void list_common_cmds_help(void);
> const char *help_unknown_cmd(const char *cmd);
>
> @@ -9,6 +55,7 @@ int cmd_annotate(int argc, const char **argv);
> int cmd_bench(int argc, const char **argv);
> int cmd_buildid_cache(int argc, const char **argv);
> int cmd_buildid_list(int argc, const char **argv);
> +int cmd_check(int argc, const char **argv);
> int cmd_config(int argc, const char **argv);
> int cmd_c2c(int argc, const char **argv);
> int cmd_diff(int argc, const char **argv);
> diff --git a/tools/perf/perf.c b/tools/perf/perf.c
> index d3fc8090413c..83dc0ac42fdb 100644
> --- a/tools/perf/perf.c
> +++ b/tools/perf/perf.c
> @@ -50,6 +50,7 @@ static struct cmd_struct commands[] = {
> { "archive", NULL, 0 },
> { "buildid-cache", cmd_buildid_cache, 0 },
> { "buildid-list", cmd_buildid_list, 0 },
> + { "check", cmd_check, 0 },
> { "config", cmd_config, 0 },
> { "c2c", cmd_c2c, 0 },
> { "diff", cmd_diff, 0 },
> --
> 2.41.0
>
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