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

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Date:	Fri, 8 Apr 2016 11:27:10 +0800
From:	"Wangnan (F)" <wangnan0@...wei.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>
CC:	<linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH 17/19] perf tools: Build syscall table .c header from
 kernel's syscall_64.tbl



On 2016/4/8 4:58, 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.
>
> Syscalls currently not available in audit-libs:
>
>    # trace -e copy_file_range,membarrier,mlock2,pread64,pwrite64,timerfd_create,userfaultfd
>    Error:	Invalid syscall copy_file_range, membarrier, mlock2, pread64, pwrite64, timerfd_create, userfaultfd
>    Hint:	try 'perf list syscalls:sys_enter_*'
>    Hint:	and: 'man syscalls'
>    #
>
> With this patch:
>
>    # trace -e copy_file_range,membarrier,mlock2,pread64,pwrite64,timerfd_create,userfaultfd
>      8505.733 ( 0.010 ms): gnome-shell/2519 timerfd_create(flags: 524288) = 36
>      8506.688 ( 0.005 ms): gnome-shell/2519 timerfd_create(flags: 524288) = 40
>     30023.097 ( 0.025 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63ae382000, count: 4096, pos: 529592320) = 4096
>     31268.712 ( 0.028 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63afd8b000, count: 4096, pos: 2314133504) = 4096
>     31268.854 ( 0.016 ms): qemu-system-x8/24629 pwrite64(fd: 18, buf: 0x7f63afda2000, count: 4096, pos: 2314137600) = 4096
>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: David Ahern <dsahern@...il.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Wang Nan <wangnan0@...wei.com>
> Link: http://lkml.kernel.org/n/tip-5n4sx1wp0ig75dwcghf9m6zs@git.kernel.org
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
>

There is racing in Makefile. I see following output:

   ...
   CC       /xx/xx/perf/1.0-r8/perf-1.0/util/callchain.o
   CC       /xx/xx/perf/1.0-r8/perf-1.0/util/values.o
   CC       /xx/xx/perf/1.0-r8/perf-1.0/util/debug.o
make[3]: *** No rule to make target 
`/xx/xx/perf/1.0-r8/perf-1.0/util/syscalltbl.o'.  Stop.
make[3]: *** Waiting for unfinished jobs....
   CC       /xx/xx/perf/1.0-r8/perf-1.0/util/machine.o
   CC       /xx/xx/perf/1.0-r8/perf-1.0/util/map.o
   ...

The error disappeareafter doing 'make archheaders' before 'make all'.

Thank you.