linux-kernel - Re: [PATCH v2 1/3] MIPS: kernel: Support extracting off-line stack traces from user-space with perf

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Date:   Thu, 4 Feb 2021 21:59:45 +0100
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org, Xuefeng Li <lixuefeng@...ngson.cn>,
        Juxin Gao <gaojuxin@...ngson.cn>,
        David Daney <david.daney@...ium.com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Archer Yan <ayan@...ecomp.com>
Subject: Re: [PATCH v2 1/3] MIPS: kernel: Support extracting off-line stack
 traces from user-space with perf

On Thu, Feb 04, 2021 at 11:35:22AM +0800, Tiezhu Yang wrote:
> Add perf_event_mips_regs/perf_reg_value/perf_reg_validate to support
> features HAVE_PERF_REGS/HAVE_PERF_USER_STACK_DUMP in kernel.
> 
> [ayan@...ecomp.com: Repick this patch for unwinding userstack backtrace
>  by perf and libunwind on MIPS based CPU.]
> 
> [ralf@...ux-mips.org: Add perf_get_regs_user() which is required after
> 'commit 88a7c26af8da ("perf: Move task_pt_regs sampling into arch code")'.]
> 
> [yangtiezhu@...ngson.cn: Fix build error about perf_get_regs_user() after
> commit 76a4efa80900 ("perf/arch: Remove perf_sample_data::regs_user_copy"),
> and also separate the original patches into two parts (MIPS kernel and perf
> tools) to merge easily.]
> 
> The original patches:
> https://lore.kernel.org/patchwork/patch/1126521/
> https://lore.kernel.org/patchwork/patch/1126520/
> 
> Signed-off-by: David Daney <david.daney@...ium.com>
> Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
> Signed-off-by: Archer Yan <ayan@...ecomp.com>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
> 
> v2: add R26 and R27 to the enum perf_event_mips_regs
> 
>  arch/mips/Kconfig                      |  2 +
>  arch/mips/include/uapi/asm/perf_regs.h | 40 ++++++++++++++++++++
>  arch/mips/kernel/Makefile              |  2 +-
>  arch/mips/kernel/perf_regs.c           | 68 ++++++++++++++++++++++++++++++++++
>  4 files changed, 111 insertions(+), 1 deletion(-)
>  create mode 100644 arch/mips/include/uapi/asm/perf_regs.h
>  create mode 100644 arch/mips/kernel/perf_regs.c

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]