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tools/perf/build: Fix timerfd feature check

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'feature_timerfd' is checked all the time and calculated explicitly,
in a serial fashion. Add it to CORE_FEATURE_TESTS which causes it to
be built in parallel, using the newfangled parallel build autodetection
code.

This shaves 137 msecs off the perf build time on my system, which
speeds up the common case cached build by 43%:

Before:

  comet:~/tip> perf stat --null --repeat 5 make -C tools/perf/
  [...]
         0,453771441 seconds time elapsed                                          ( +-  0,09% )

After:

  comet:~/tip> perf stat --null --repeat 5 make -C tools/perf/
  [...]
         0,316290185 seconds time elapsed                                          ( +-  0,24% )

Cc: David Ahern <dsahern@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/n/tip-bb92CmexihopoSyqnkqepvsy@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2013-11-14 08:33:24 +01:00
parent 555a098af6
commit bb4c5500c9
1 changed files with 2 additions and 2 deletions
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4
tools/perf/config/Makefile
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@ -142,7 +142,8 @@ CORE_FEATURE_TESTS = \
libunwind \
on-exit \
stackprotector \
stackprotector-all
stackprotector-all \
timerfd
#
# So here we detect whether test-all was rebuilt, to be able
@ -405,7 +406,6 @@ else
endif
endif
$(call feature_check,timerfd)
ifeq ($(feature-timerfd), 1)
CFLAGS += -DHAVE_TIMERFD_SUPPORT
else