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tools build feature: Check if eventfd() is available

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A new 'perf bench epoll' will use this, and to disable it for older
systems, add a feature test for this API.

This is just a simple program that if successfully compiled, means that
the feature is present, at least at the library level, in a build that
sets the output directory to /tmp/build/perf (using O=/tmp/build/perf),
we end up with:

  $ ls -la /tmp/build/perf/feature/test-eventfd*
  -rwxrwxr-x. 1 acme acme 8176 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.bin
  -rw-rw-r--. 1 acme acme  588 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.d
  -rw-rw-r--. 1 acme acme    0 Nov 21 15:58 /tmp/build/perf/feature/test-eventfd.make.output
  $ ldd /tmp/build/perf/feature/test-eventfd.bin
	  linux-vdso.so.1 (0x00007fff3bf3f000)
	  libc.so.6 => /lib64/libc.so.6 (0x00007fa984061000)
	  /lib64/ld-linux-x86-64.so.2 (0x00007fa984417000)
  $ grep eventfd -A 2 -B 2 /tmp/build/perf/FEATURE-DUMP
  feature-dwarf=1
  feature-dwarf_getlocations=1
  feature-eventfd=1
  feature-fortify-source=1
  feature-sync-compare-and-swap=1
  $

The main thing here is that in the end we'll have -DHAVE_EVENTFD in
CFLAGS, and then the 'perf bench' entry needing that API can be
selectively pruned.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Jason Baron <jbaron@akamai.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: https://lkml.kernel.org/n/tip-wkeldwob7dpx6jvtuzl8164k@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2018-11-21 17:42:00 -03:00
parent d47d77c3f0
commit 11c6cbe706
5 changed files with 23 additions and 1 deletions
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1
tools/build/Makefile.feature
View File

@ -31,6 +31,7 @@ FEATURE_TESTS_BASIC := \
backtrace \
dwarf \
dwarf_getlocations \
eventfd \
fortify-source \
sync-compare-and-swap \
get_current_dir_name \

4
tools/build/feature/Makefile
View File

@ -5,6 +5,7 @@ FILES= \
test-bionic.bin \
test-dwarf.bin \
test-dwarf_getlocations.bin \
test-eventfd.bin \
test-fortify-source.bin \
test-sync-compare-and-swap.bin \
test-get_current_dir_name.bin \
@ -102,6 +103,9 @@ $(OUTPUT)test-bionic.bin:
$(OUTPUT)test-libelf.bin:
$(BUILD) -lelf
$(OUTPUT)test-eventfd.bin:
$(BUILD)
$(OUTPUT)test-get_current_dir_name.bin:
$(BUILD)

5
tools/build/feature/test-all.c
View File

@ -50,6 +50,10 @@
# include "test-dwarf_getlocations.c"
#undef main
#define main main_test_eventfd
# include "test-eventfd.c"
#undef main
#define main main_test_libelf_getphdrnum
# include "test-libelf-getphdrnum.c"
#undef main
@ -182,6 +186,7 @@ int main(int argc, char *argv[])
main_test_glibc();
main_test_dwarf();
main_test_dwarf_getlocations();
main_test_eventfd();
main_test_libelf_getphdrnum();
main_test_libelf_gelf_getnote();
main_test_libelf_getshdrstrndx();

9
tools/build/feature/test-eventfd.c Normal file
View File

@ -0,0 +1,9 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018, Red Hat Inc, Arnaldo Carvalho de Melo <acme@redhat.com>
#include <sys/eventfd.h>
int main(void)
{
return eventfd(0, EFD_NONBLOCK);
}

5
tools/perf/Makefile.config
View File

@ -299,11 +299,14 @@ ifndef NO_BIONIC
endif
endif
ifeq ($(feature-eventfd), 1)
CFLAGS += -DHAVE_EVENTFD
endif
ifeq ($(feature-get_current_dir_name), 1)
CFLAGS += -DHAVE_GET_CURRENT_DIR_NAME
endif
ifdef NO_LIBELF
NO_DWARF := 1
NO_DEMANGLE := 1