linux-kernel - Re: [PATCH v5 3/5] perf callchain: Add support for cross-platform unwind

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Date:	Fri, 27 May 2016 09:38:48 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Hekuang <hekuang@...wei.com>
Cc:	peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	alexander.shishkin@...ux.intel.com, wangnan0@...wei.com,
	jpoimboe@...hat.com, ak@...ux.intel.com, eranian@...gle.com,
	namhyung@...nel.org, adrian.hunter@...el.com,
	sukadev@...ux.vnet.ibm.com, masami.hiramatsu.pt@...achi.com,
	tumanova@...ux.vnet.ibm.com, kan.liang@...el.com,
	penberg@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/5] perf callchain: Add support for cross-platform
 unwind

On Fri, May 27, 2016 at 03:13:04PM +0800, Hekuang wrote:

SNIP

> >    - I understand we need to compile 3 objects from unwind-libunwind.c,
> >      how about we create 3 files like:
> > 
> >      util/unwind-libunwind-local.c
> >      util/unwind-libunwind-x86_32.c
> >      util/unwind-libunwind-arm64.c
> > 
> >      which would setup all necessary defines and include unwind-libunwind.c like:
> > 
> >      ---
> >      /* comments explaining every define ;-) */
> >      ...
> >      #define LOCAL... REMOTE..
> >      ...
> >      #include <util/unwind-libunwind-local.c>
> >      ...
> >      ----
> > 
> >      this way we will keep all the special setup for given unwind object
> >      in one place and you can also use simple rule in the Build file like
> >      without defining special rule:
> > 
> >      libperf-$(CONFIG_LIBUNWIND_X86)      += unwind-libunwind_x86_32.o
> >      libperf-$(CONFIG_LIBUNWIND_AARCH64)  += unwind-libunwind_arm64.o
> > 
> >      the same way for the arch object:
> > 
> >      arch/x86/util/unwind-libunwind-local.c
> >      arch/x86/util/unwind-libunwind-x86_32.c
> > 
> > 
> > Not sure I thought everything through, but I think this way
> > we'll keep it more maintainable and readable..
> > 
> > let me know what you think
> 
> The only concern is that, if later we support more platforms,
> there will be too much files named as 'tools/perf/util/unwind-libunwind*.c'
> Is it acceptable or not?
> 
> And I thought all files belongs to specific archs should
> go to folder under 'tools/perf/arch/xxx', is that right?

hum, I wouldn't worry about that.. but you're right,
let's put them under arch

thanks,
jirka