linux-kernel - Re: [PATCH 2/6] pstore: Add event tracing support

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Message-ID: <edd40dff-fc1e-6370-0839-7672ada4db54@codeaurora.org>
Date:   Mon, 17 Sep 2018 22:47:05 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Kees Cook <keescook@...omium.org>,
        Joel Fernandes <joel@...lfernandes.org>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Laura Abbott <labbott@...hat.com>,
        Anton Vorontsov <anton@...msg.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Colin Cross <ccross@...roid.com>,
        Jason Baron <jbaron@...mai.com>,
        Tony Luck <tony.luck@...el.com>, Arnd Bergmann <arnd@...db.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Joe Perches <joe@...ches.com>,
        Jim Cromie <jim.cromie@...il.com>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Prasad Sodagudi <psodagud@...eaurora.org>,
        tsoni@...eaurora.org, Bryan Huntsman <bryanh@...eaurora.org>,
        Tingwei Zhang <tingwei@...eaurora.org>,
        Rob Herring <robh@...nel.org>
Subject: Re: [PATCH 2/6] pstore: Add event tracing support

On 9/17/2018 8:24 PM, Kees Cook wrote:
> On Sun, Sep 16, 2018 at 6:55 AM, Joel Fernandes <joel@...lfernandes.org> wrote:
>> On Sun, Sep 16, 2018, 12:08 AM Sai Prakash Ranjan
>> <saiprakash.ranjan@...eaurora.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