linux-kernel - Re: [PATCH 28/28] perf tools: Add udis86 disassembler feature check

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Date:	Thu, 5 Dec 2013 11:45:46 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 28/28] perf tools: Add udis86 disassembler feature check


* Jiri Olsa <jolsa@...hat.com> wrote:

> On Thu, Dec 05, 2013 at 10:25:02AM +0100, Ingo Molnar wrote:
> > 
> > * Jiri Olsa <jolsa@...hat.com> wrote:
> > 
> > > On Wed, Dec 04, 2013 at 03:50:24PM -0300, Arnaldo Carvalho de Melo wrote:
> > > > Em Tue, Dec 03, 2013 at 02:09:42PM +0100, Jiri Olsa escreveu:
> > > > > Adding udis86 disassembler feature check which support
> > > > > is needed for kvm:kvm_emulate_insn tracepoint.
> > > > >  
> > > > > +$(call feature_check,udis86)
> > > > > +ifeq ($(feature-udis86), 1)
> > > > > +  LIBTRACEEVENT_CFLAGS += -DHAVE_UDIS86
> > > > > +  EXTLIBS += -ludis86
> > > > > +else
> > > > > +  msg := $(warning No udis86 support.);
> > > > > +endif
> > > > 
> > > > That is really an incomplete message, what package should I install?
> > > > Perhaps we should add this there then:
> > > > 
> > > > http://bit.ly/1hyrN52
> > > 
> > > nice :-)
> > > 
> > > > 
> > > > Wow, that was easy, but yeah, could be made easier 8-) ;-P
> > > 
> > > so something like:
> > > No udis86 found. Please install udis86-devel.
> > > 
> > > or:
> > > No udis86 found, disabling kvm tracepoints instruction disassembly. Please install udis86-devel.
> > 
> > 1)
> > 
> > So, the first problem I can see is in the output:
> > 
> > Auto-detecting system features:
> > ...                     backtrace: [ on  ]
> > ...                         dwarf: [ on  ]
> > ...                fortify-source: [ on  ]
> > ...                         glibc: [ on  ]
> > ...                          gtk2: [ on  ]
> > ...                  gtk2-infobar: [ on  ]
> > ...                      libaudit: [ on  ]
> > ...                        libbfd: [ on  ]
> > ...                        libelf: [ on  ]
> > ...             libelf-getphdrnum: [ on  ]
> > ...                   libelf-mmap: [ on  ]
> > ...                       libnuma: [ on  ]
> > ...                       libperl: [ on  ]
> > ...                     libpython: [ on  ]
> > ...             libpython-version: [ on  ]
> > ...                      libslang: [ on  ]
> > ...                     libunwind: [ on  ]
> > ...                       on-exit: [ on  ]
> > ...            stackprotector-all: [ on  ]
> > ...                       timerfd: [ on  ]
> > 
> > config/Makefile:421: No udis86 support.
> > 
> > such a 'no XYZ support' message should only occur if a feature test 
> > failed. _If_ we decide that 'udis86' support is required for a full 
> > perf build then there should be a new line saying something like:
> > 
> > ...                        udis86: [ OFF ]
> 
> hum, just sent v4 that added udis86 into above list ;-)
> 
> So.. do we consider 'full perf build' to be build with all
> possible libraries linked in?

So my worry is, how widely is libudis86 available in distros? What is 
the package name on Debian/Ubuntu for example?

Thanks,

	Ingo
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