linux-kernel - Re: [PATCH 17/19] perf tools: Build syscall table .c header from kernel's syscall

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Date:	Thu, 7 Apr 2016 15:49:56 -0600
From:	David Ahern <dsahern@...il.com>
To:	Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 17/19] perf tools: Build syscall table .c header from
 kernel's syscall_64.tbl

Upon further review ...

On 4/7/16 2:58 PM, Arnaldo Carvalho de Melo wrote:
> From: Arnaldo Carvalho de Melo <acme@...hat.com>
>
> We used libaudit to map ids to syscall names and vice-versa, but that
> imposes a delay in supporting new syscalls, having to wait for libaudit
> to get those new syscalls on its tables.
>
> To remove that delay, for x86_64 initially, grab a copy of
> arch/x86/entry/syscalls/syscall_64.tbl and use it to generate those
> tables.


>   tools/perf/Makefile.perf                          |  11 +-
>   tools/perf/arch/x86/Makefile                      |  23 ++
>   tools/perf/arch/x86/entry/syscalls/syscall_64.tbl | 374 ++++++++++++++++++++++
>   tools/perf/arch/x86/entry/syscalls/syscalltbl.sh  |  39 +++

Why make a copies of the files? Why can't perf reference the ones 2 
levels up?