linux-kernel - RE: [PATCH 0/4] x86/insn: perf tools: Add a few new x86 instructions

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Message-ID: <50399556C9727B4D88A595C8584AAB3752502944@GSjpTKYDCembx32.service.hitachi.net>
Date:	Wed, 2 Sep 2015 06:41:37 +0000
From:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
To:	"'Jiri Olsa'" <jolsa@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Adrian Hunter <adrian.hunter@...el.com>,
	Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Andy Lutomirski" <luto@...capital.net>,
	Denys Vlasenko <dvlasenk@...hat.com>,
	"Peter Zijlstra" <peterz@...radead.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Qiaowei Ren <qiaowei.ren@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>
Subject: RE: [PATCH 0/4] x86/insn: perf tools: Add a few new x86 instructions

> From: Jiri Olsa [mailto:jolsa@...hat.com]
> 
> On Tue, Sep 01, 2015 at 04:57:16PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Tue, Sep 01, 2015 at 03:16:52PM +0300, Adrian Hunter escreveu:
> > > On 01/09/15 11:54, Ingo Molnar wrote:
> > > >
> > > > * Adrian Hunter <adrian.hunter@...el.com> wrote:
> > > >
> > > >> Hi
> > > >>
> > > >> perf tools has a copy of the x86 instruction decoder for decoding
> > > >> Intel PT. [...]
> > > >
> > > > So that's the arch/x86/lib/insn.c instruction length decoder that the kernel uses
> > > > for kprobes et al - and the two versions already forked slightly:
> > > >
> > > > -#include "inat.h"
> > > > -#include "insn.h"
> > > > +#include <asm/inat.h>
> > > > +#include <asm/insn.h>
> > > >
> > > > it would be nice to add a diff check to the perf build, and (non-fatally) warn
> > > > during the build if the two versions depart from each other?
> > >
> > > I had a go and came up with this.  Arnaldo, Jiri any comments?
> >
> > So, I was going to try and merge this series, can you please collect the
> > Acks by Masami and Jiri and resubmit?
> >
> > I'd say no need to stop this just to get a build function to use with
> > this, the test below should do the trick _for this specific instance_
> > and then, after we get this, you should use it as the initial usecase
> > for adding the build function, d'accord?
> >
> > Jiri, are you ok with this?
> 
> sure, np you can use my ack

I'm also OK for this patch. I just concern that is OK for Adrian too? 
Since this ensures all the copied code should be dead copy (not modified anymore),
if we want a different instruction decoding routine, we have to break the test
anyway.

Thank you,

> 
> jirka
> 
> >
> > - Arnaldo
> >
> > > diff --git a/tools/perf/util/intel-pt-decoder/Build b/tools/perf/util/intel-pt-decoder/Build
> > > index 240730d682c1..1b8a32de8504 100644
> > > --- a/tools/perf/util/intel-pt-decoder/Build
> > > +++ b/tools/perf/util/intel-pt-decoder/Build
> > > @@ -6,6 +6,17 @@ inat_tables_maps = util/intel-pt-decoder/x86-opcode-map.txt
> > >  $(OUTPUT)util/intel-pt-decoder/inat-tables.c: $(inat_tables_script) $(inat_tables_maps)
> > >  	@$(call echo-cmd,gen)$(AWK) -f $(inat_tables_script) $(inat_tables_maps) > $@ || rm -f $@
> > >
> > > -$(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/inat.c
> $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> > > +$(OUTPUT)util/intel-pt-decoder/intel-pt-insn-decoder.o: util/intel-pt-decoder/intel-pt-insn-decoder.c
> util/intel-pt-decoder/inat.c $(OUTPUT)util/intel-pt-decoder/inat-tables.c
> > > +	@test -d ../../arch/x86 && (( \
> > > +	diff -B -I'^#include' util/intel-pt-decoder/insn.c ../../arch/x86/lib/insn.c >/dev/null && \
> > > +	diff -B -I'^#include' util/intel-pt-decoder/inat.c ../../arch/x86/lib/inat.c >/dev/null && \
> > > +	diff -B util/intel-pt-decoder/x86-opcode-map.txt ../../arch/x86/lib/x86-opcode-map.txt >/dev/null && \
> > > +	diff -B util/intel-pt-decoder/gen-insn-attr-x86.awk ../../arch/x86/tools/gen-insn-attr-x86.awk >/dev/null && \
> > > +	diff -B -I'^#include' util/intel-pt-decoder/insn.h ../../arch/x86/include/asm/insn.h >/dev/null && \
> > > +	diff -B -I'^#include' util/intel-pt-decoder/inat.h ../../arch/x86/include/asm/inat.h >/dev/null && \
> > > +	diff -B -I'^#include' util/intel-pt-decoder/inat_types.h ../../arch/x86/include/asm/inat_types.h >/dev/null) \
> > > +	|| echo "Warning: Intel PT: x86 instruction decoder differs from kernel" >&2 )
> > > +	$(call rule_mkdir)
> > > +	$(call if_changed_dep,cc_o_c)
> > >
> > >  CFLAGS_intel-pt-insn-decoder.o += -I$(OUTPUT)util/intel-pt-decoder -Wno-override-init
> > >
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