linux-kernel - Re: [GIT PULL 0/7] perf/core improvements and fixes

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Message-ID: <20151124082805.GB30337@krava.brq.redhat.com>
Date:	Tue, 24 Nov 2015 09:28:05 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Jan Kratochvil <jkratoch@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Milian Wolff <milian.wolff@...b.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Taeung Song <treeze.taeung@...il.com>,
	Wang Nan <wangnan0@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 0/7] perf/core improvements and fixes

On Tue, Nov 24, 2015 at 09:10:42AM +0100, Ingo Molnar wrote:

SNIP

> 
>   GEN      common-cmds.h
>   CC       perf-read-vdso32
>   CC       perf-read-vdsox32
>   CC       ui/gtk/browser.o
>   CC       ui/gtk/hists.o
>   CC       ui/gtk/setup.o
>   CC       ui/gtk/util.o
>   CC       ui/gtk/helpline.o
>   CC       ui/gtk/progress.o
>   CC       ui/gtk/annotate.o
>   CC       util/abspath.o
>   CC       fd/array.o
> 
> Auto-detecting system features:
>   CC       event-parse.o
> ...                        libelf: [ on  ]
>   PERF_VERSION = 4.4.rc2.g9327ca
> ...                           bpf: [ on  ]
> 
>   CC       util/alias.o
>   CC       libbpf.o
> 
> 
> while normally we'd first do feature detection, then only do the build (knowing 
> which features to build).

the bpf lib is doing its own feature detection, to be able
to stand alone.. I'll see if we could share detected features
somehow, so sub builds don't need to do that

> 
> Occasionally it also triggers a build failure:
> 
>   CC       plugin_kvm.o
>   CC       arch/common.o
>   CC       util/db-export.o
>   LD       plugin_kmem-in.o
> fixdep: error opening depfile: ./.plugin_kmem.o.d: No such file or directory
> /home/mingo/tip/tools/build/Makefile.build:77: recipe for target 'plugin_kmem.o' 
> failed
> make[3]: *** [plugin_kmem.o] Error 2
> Makefile:189: recipe for target 'plugin_kmem-in.o' failed
> make[2]: *** [plugin_kmem-in.o] Error 2
> Makefile.perf:424: recipe for target 'install-traceevent-plugins' failed
> make[1]: *** [install-traceevent-plugins] Error 2
> make[1]: *** Waiting for unfinished jobs....
> 
> that too seems to be a result of unwanted, over-eager parallelism.

hm, haven't seen that one for long time now ;-) will check

thanks,
jirka
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