Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753341Ab3JBJ3D (ORCPT ); Wed, 2 Oct 2013 05:29:03 -0400 Received: from mail-bk0-f45.google.com ([209.85.214.45]:40801 "EHLO mail-bk0-f45.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753216Ab3JBJ27 (ORCPT ); Wed, 2 Oct 2013 05:28:59 -0400 Date: Wed, 2 Oct 2013 11:28:56 +0200 From: Ingo Molnar To: Linus Torvalds Cc: Linux Kernel Mailing List , Arnaldo Carvalho de Melo , Peter Zijlstra , Thomas Gleixner , Andrew Morton , Namhyung Kim , David Ahern , Jiri Olsa Subject: [PATCH] tools/perf/build: Automatically build in parallel, based on number of CPUs in the system Message-ID: <20131002092856.GA9360@gmail.com> References: <20130912133855.GA23780@gmail.com> <20131002073140.GA6652@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20131002073140.GA6652@gmail.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2393 Lines: 83 This patch below fixes another tools/perf build system annoyance: that it does not build in parallel by default. The effect is that for example 'make install' will build in parallel (dependent on number of CPUs in the system) and then install the result. Thanks, Ingo =======================> Subject: tools/perf/build: Automatically build in parallel, based on number of CPUs in the system From: Ingo Molnar Date: Wed Oct 2 11:18:28 CEST 2013 Implement automatic parallel builds when building in tools/perf: $ time make # [ perf build: Doing 'make -j12' parallel build. ] Auto-detecting system features: ... real 0m9.265s user 0m59.888s sys 0m6.082s On GNU make achieving this is not particularly easy, it requires a separate makefile, which then invokes the main Makefile. ( Note: this patch adds Makefile.parallel to show the concept - the two makefiles will be flipped in the next patch to avoid having to specify -f to get parallelism in the default build. ) Cc: Arnaldo Carvalho de Melo Cc: Peter Zijlstra Cc: Namhyung Kim Cc: David Ahern Cc: Jiri Olsa Signed-off-by: Ingo Molnar --- tools/perf/Makefile.parallel | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) Index: tip/tools/perf/Makefile.parallel =================================================================== --- /dev/null +++ tip/tools/perf/Makefile.parallel @@ -0,0 +1,26 @@ +# +# Do a parallel build with multiple jobs, based on the number of CPUs online +# in this system: 'make -j8' on a 8-CPU system, etc. +# +# (To override it, run 'make JOBS=1' and similar.) +# +ifeq ($(JOBS),) + JOBS := $(shell grep -c ^processor /proc/cpuinfo 2>/dev/null) + ifeq ($(JOBS),) + JOBS := 1 + endif +endif + +export JOBS + +$(info $(shell printf '# [ perf build: Doing '\''make \033[33m-j'$(JOBS)'\033[m'\'' parallel build. ]\n')) + +# +# Needed if no target specified: +# +all: + @$(MAKE) --no-print-directory -j$(JOBS) $@ + +%: + @$(MAKE) --no-print-directory -j$(JOBS) $@ + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/