linux-kernel - Re: [PATCH 0/3] Fixes on remote unwind

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Date:	Tue, 21 Jun 2016 09:59:00 +0800
From:	Hekuang <hekuang@...wei.com>
To:	<peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...hat.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>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] Fixes on remote unwind



在 2016/6/8 18:15, He Kuang 写道:
> The remote unwind can supported scenario where we collect on a x86_64
> machine and want to do analysis on a ARM64 or x86-32 machine. Though
> this is not tested, after Arnaldo questioned the above issue, I tested
> and found a bug.
>
> In util/unwind-libunwind-local.c, PERF_REG_SP/IP is used, but those
> macros are assigned to the host platform, we should redefine them in
> the wrapper file, for example in "util/libunwind/x86_32.c".
>
> After fixing this problem, i686 perf.data can be parsed on aarch64
> machine.
>
> To Arnaldo, I noticed that this patch
> "perf tools: Find vdso supporting cross-platform analysis"
> is not on "origin/perf/unwind" branch, this patch was applied, please
> check if it was missed, the above test needs this patch.
Thanks for solving this, and please have a look at the patches in
this thread.
>
> He Kuang (3):
>    perf unwind: Change macro names of perf register
>    perf unwind: Fix wrongly used regs for x86_32 unwind
>    perf unwind: Fix wrongly used regs for aarch64 unwind
>
>   tools/perf/util/libunwind/arm64.c        | 5 +++++
>   tools/perf/util/libunwind/x86_32.c       | 6 ++++++
>   tools/perf/util/unwind-libunwind-local.c | 6 ++++--
>   tools/perf/util/unwind.h                 | 9 +++++++++
>   4 files changed, 24 insertions(+), 2 deletions(-)
>