linux-kernel - Re: [RFC PATCH v6 25/32] perf tools: Add 'bpf.' config section to perf default config

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Date:	Thu, 11 Jun 2015 16:45:53 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	Wang Nan <wangnan0@...wei.com>, acme@...nel.org,
	brendan.d.gregg@...il.com, daniel@...earbox.net,
	masami.hiramatsu.pt@...achi.com, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, mingo@...hat.com, jolsa@...nel.org,
	dsahern@...il.com, linux-kernel@...r.kernel.org,
	lizefan@...wei.com, hekuang@...wei.com, xiakaixu@...wei.com,
	pi3orama@....com
Subject: Re: [RFC PATCH v6 25/32] perf tools: Add 'bpf.' config section to
 perf default config

On Tue, Jun 09, 2015 at 04:43:19PM -0700, Alexei Starovoitov wrote:
> On 6/8/15 10:50 PM, Wang Nan wrote:
> >perf_bpf_config() is added to parse 'bpf' section in perf config file.
> >Following is an example:
> >
> >  [bpf]
> >    clang-path = /llvm/bin/x86_64-linux-clang"
> >    llc-path = /llvm/bin/x86_64-linux-llc"
> >    clang-opt = "-nostdinc -isystem /llvm/lib/clang/include -I/kernel/arch/x86/include ..."
> >    llc-opt = ""
> 
> a section to specify -I flags to compile prog.c is useful,
> but users shouldn't be populating it manually for kernel headers.
> How about adding a script that can figure out $(LINUXINCLUDE)
> automatically ?

Maybe a dummy question.  For what reason it needs such headers?  Is it
possible to have a (part of?) copy of needed bits in the perf source?

Thanks,
Namhyung


> You can even invoke such flag detector from perf via something like:
> f = open /tmpdir/Makefile
> fprintf(f, "obj-y := dummy.o\n");
> fprintf(f, "$(obj)/%%.o: $(src)/%%.c\n");
> fprintf(f, "\t@...o -n \"$(NOSTDINC_FLAGS) $(LINUXINCLUDE) $(EXTRA_CFLAGS)\"
> > %s\n", cachefile);
> snprintf(cmd, "make -s -C /lib/modules/%s/build M=%s dummy.o",
>    uts_release, tmpdir);
> system(cmd);
> read flags from cachefile and cache it for the future.
> ...
> or as independent script that populates .perfconfig
> 
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