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Subject: Re: [PATCH 2/6] pstore: Add event tracing support
To:     Kees Cook <keescook@chromium.org>,
        Joel Fernandes <joel@joelfernandes.org>
Cc:     Steven Rostedt <rostedt@goodmis.org>,
        Ingo Molnar <mingo@redhat.com>,
        Laura Abbott <labbott@redhat.com>,
        Anton Vorontsov <anton@enomsg.org>,
        Rob Herring <robh+dt@kernel.org>, devicetree@vger.kernel.org,
        Colin Cross <ccross@android.com>,
        Jason Baron <jbaron@akamai.com>,
        Tony Luck <tony.luck@intel.com>, Arnd Bergmann <arnd@arndb.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Joe Perches <joe@perches.com>,
        Jim Cromie <jim.cromie@gmail.com>,
        Rajendra Nayak <rnayak@codeaurora.org>,
        Vivek Gautam <vivek.gautam@codeaurora.org>,
        Sibi Sankar <sibis@codeaurora.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        LKML <linux-kernel@vger.kernel.org>,
        linux-arm-msm@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Ingo Molnar <mingo@kernel.org>,
        Tom Zanussi <tom.zanussi@linux.intel.com>,
        Prasad Sodagudi <psodagud@codeaurora.org>,
        tsoni@codeaurora.org, Bryan Huntsman <bryanh@codeaurora.org>,
        Tingwei Zhang <tingwei@codeaurora.org>,
        Rob Herring <robh@kernel.org>
References: <cover.1536430404.git.saiprakash.ranjan@codeaurora.org>
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 <141901b8-0a9a-2e7a-f7a4-cdefd157f4c6@codeaurora.org>
 <CAEXW_YSPNqVgoYWjVAMvGg_WoRV4SC2xDH1wQWTdQfBUOMQbbQ@mail.gmail.com>
 <CAGXu5jLkE+mZkVSFPeOq75im0Kozm+NzfqL9CD-OMe7b7=3O5g@mail.gmail.com>
From:   Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Message-ID: <edd40dff-fc1e-6370-0839-7672ada4db54@codeaurora.org>
Date:   Mon, 17 Sep 2018 22:47:05 +0530
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On 9/17/2018 8:24 PM, Kees Cook wrote:
> On Sun, Sep 16, 2018 at 6:55 AM, Joel Fernandes <joel@joelfernandes.org> wrote:
>> On Sun, Sep 16, 2018, 12:08 AM Sai Prakash Ranjan
>> <saiprakash.ranjan@codeaurora.org> wrote:
>>>
>>> On 9/9/2018 1:57 AM, Sai Prakash Ranjan wrote:
>>>> Currently pstore has function trace support which can be
>>>> used to get the function call chain with limited data.
>>>> Event tracing has extra data which is useful to debug wide
>>>> variety of issues and is heavily used across the kernel.
>>>>
>>>> Adding this support to pstore can be very helpful to debug
>>>> different subsystems since almost all of them have trace
>>>> events already available. And also it is useful to debug
>>>> unknown resets or crashes since we can get lot more info
>>>> from event tracing by viewing the last occurred events.
>>>
>>> Anyone here?
>>
>> Sorry for the top post. I've been wanting to do this as well for some time.
>> It's quite useful. I am out of office this week and away from work machine.
>> I will take a look at your patches next week once I'm back at work. Thanks.
> 
> If Steven agrees this shouldn't live in ftrace directly and Joel
> reviews these patches, I think it should be fine. I'm travelling, but
> I can review it hopefully later this week.
> 

Thank you Kees.

- Sai