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perf check: Allow showing a tip for opt-in features not built into perf

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Ingo reported that it was difficult to understand why libunwind support
didn't link even when he had the usual libunwind-dev files installed in
his machine.

This is because libunwind became opt-in, the user has to use
LIBUNWIND=1, as it was deemed stalled in its development/unsuitable for
use with perf, IIRC, and so we better use the elfutils equivalent
routine that we also supported for ages.

But the build message still printed:

  Auto-detecting system features:
  ...                                   libdw: [ on  ]
  ...                                   glibc: [ on  ]
  <SNIP>
  ...                               libcrypto: [ on  ]
  ...                               libunwind: [ OFF ]
  <SNIP>

Which is confusing, so allow for having a tip when 'perf version
--build-options' is used, and variants with 'perf check feature':

  $ perf version --build-options | grep libunwind
             libunwind: [ OFF ]  # HAVE_LIBUNWIND_SUPPORT ( tip: Deprecated, use LIBUNWIND=1 and install libunwind-dev[el] to build with it )
  $
  $ perf check feature libunwind
             libunwind: [ OFF ]  # HAVE_LIBUNWIND_SUPPORT ( tip: Deprecated, use LIBUNWIND=1 and install libunwind-dev[el] to build with it )
  $

The next patches will remove the opt-in libunwind FEATURES_DISPLAY.

Reported-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Howard Chu <howardchu95@gmail.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/Z--pWmTHGb62_83e@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2025-04-08 10:56:30 -03:00
parent 0afeacbc8d
commit 31d7e60063
2 changed files with 14 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

15
tools/perf/builtin-check.c
View file

@ -27,6 +27,12 @@ static const char *check_feature_usage[] = {
.macro = #macro_, \
.is_builtin = IS_BUILTIN(macro_) }
#define FEATURE_STATUS_TIP(name_, macro_, tip_) { \
.name = name_, \
.macro = #macro_, \
.tip = tip_, \
.is_builtin = IS_BUILTIN(macro_) }
struct feature_status supported_features[] = {
FEATURE_STATUS("aio", HAVE_AIO_SUPPORT),
FEATURE_STATUS("bpf", HAVE_LIBBPF_SUPPORT),
@ -48,7 +54,7 @@ struct feature_status supported_features[] = {
FEATURE_STATUS("libpython", HAVE_LIBPYTHON_SUPPORT),
FEATURE_STATUS("libslang", HAVE_SLANG_SUPPORT),
FEATURE_STATUS("libtraceevent", HAVE_LIBTRACEEVENT),
FEATURE_STATUS("libunwind", HAVE_LIBUNWIND_SUPPORT),
FEATURE_STATUS_TIP("libunwind", HAVE_LIBUNWIND_SUPPORT, "Deprecated, use LIBUNWIND=1 and install libunwind-dev[el] to build with it"),
FEATURE_STATUS("lzma", HAVE_LZMA_SUPPORT),
FEATURE_STATUS("numa_num_possible_cpus", HAVE_LIBNUMA_SUPPORT),
FEATURE_STATUS("zlib", HAVE_ZLIB_SUPPORT),
@ -78,7 +84,12 @@ void feature_status__printf(const struct feature_status *feature)
printf("%22s: ", name);
on_off_print(status);
printf(" # %s\n", macro);
printf(" # %s", macro);
if (!feature->is_builtin && feature->tip)
printf(" ( tip: %s )", feature->tip);
putchar('\n');
}
/**

1
tools/perf/builtin.h
View file

@ -5,6 +5,7 @@
struct feature_status {
const char *name;
const char *macro;
const char *tip;
int is_builtin;
};