linux-kernel - Re: [PATCHv2 4/4] arm64: Enable perf events based hard lockup detector

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Date:   Fri, 24 Sep 2021 21:31:57 +0800
From:   Pingfan Liu <kernelfans@...il.com>
To:     Sumit Garg <sumit.garg@...aro.org>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.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>,
        Marc Zyngier <maz@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Petr Mladek <pmladek@...e.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Wang Qing <wangqing@...o.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Santosh Sivaraj <santosh@...six.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 4/4] arm64: Enable perf events based hard lockup detector

On Fri, Sep 24, 2021 at 1:19 PM Sumit Garg <sumit.garg@...aro.org> wrote:
>
> Hi Pingfan,
>
> On Thu, 23 Sept 2021 at 19:59, Pingfan Liu <kernelfans@...il.com> wrote:
> >
> > On Thu, Sep 23, 2021 at 10:10 PM Pingfan Liu <kernelfans@...il.com> wrote:
> > >
> > > From: Sumit Garg <sumit.garg@...aro.org>
> > >
> > To Sumit, I think credits should go to you and keep you as the author.
> >
>
> Thanks, I am fine with it. If you like then you can add your
> "Co-developed-by" as well.
>
OK, I will.

> > > One thing to note here is that normally lockup detector is initialized
> > > just after the early initcalls but PMU on arm64 comes up much later as
> > > device_initcall(). So we need to re-initialize lockup detection once
> > > PMU has been initialized.
>
> This needs to be updated to reflect delayed initialization instead.
>
I will update the commit log accordingly.

Thanks,

Pingfan