linux-kernel - Re: [PATCH v6 10/11] perf callchain: Support x86 target platform

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Message-ID: <574C03C7.9030807@huawei.com>
Date:	Mon, 30 May 2016 17:11:35 +0800
From:	Hekuang <hekuang@...wei.com>
To:	Jiri Olsa <jolsa@...hat.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 v6 10/11] perf callchain: Support x86 target platform

hi

在 2016/5/30 16:53, Jiri Olsa 写道:
> On Sat, May 28, 2016 at 11:59:59AM +0000, He Kuang wrote:
>> Support x86(32-bit) cross platform callchain unwind.
>>
>> Signed-off-by: He Kuang <hekuang@...wei.com>
>> ---
>>   tools/perf/arch/Build                              |  1 +
>>   tools/perf/arch/x86/util/unwind-libunwind.c        |  7 ++++---
>>   tools/perf/arch/x86/util/unwind-libunwind_x86_32.c | 21 +++++++++++++++++++++
>>   tools/perf/util/unwind-libunwind-local.c           |  4 ++++
>>   tools/perf/util/unwind-libunwind.c                 | 19 +++++++++++++------
>>   tools/perf/util/unwind.h                           | 10 ++++++++++
>>   6 files changed, 53 insertions(+), 9 deletions(-)
>>   create mode 100644 tools/perf/arch/x86/util/unwind-libunwind_x86_32.c
>>
>> diff --git a/tools/perf/arch/Build b/tools/perf/arch/Build
>> index 109eb75..3fc4af1 100644
>> --- a/tools/perf/arch/Build
>> +++ b/tools/perf/arch/Build
>> @@ -1,2 +1,3 @@
>>   libperf-y += common.o
>>   libperf-y += $(ARCH)/
>> +libperf-$(CONFIG_LIBUNWIND_X86)      += x86/util/unwind-libunwind_x86_32.o
> we have Build file directly in arch/x86/util/
>
> if you do it like this to include generic file easily
> we better fix the include then

This is because "libperf-y += $(ARCH)" will only sink into $(ARCH) folder,
for example on x86_64, only tools/perf/arch/x86 will be built. But for
  remote libunwind, we also need
  'tools/perf/arch/arm64/util/unwind-libunwind.o', while arm64 folder is
not added to libperf-y. Is there a gracefull to deal with this?

> jirka
>