linux-kernel - Re: [PATCHv3 3/3] dynamic_debug: Add a flag for dynamic event tracing

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Message-ID: <c5715db5-965b-c1f5-3e99-04caec3d4f2c@quicinc.com>
Date:   Tue, 9 Nov 2021 23:19:19 +0530
From:   Sai Prakash Ranjan <quic_saipraka@...cinc.com>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        <quic_psodagud@...cinc.com>, Marc Zyngier <maz@...nel.org>,
        <gregkh@...uxfoundation.org>, <arnd@...db.de>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <mingo@...hat.com>, <jbaron@...mai.com>, <jim.cromie@...il.com>
Subject: Re: [PATCHv3 3/3] dynamic_debug: Add a flag for dynamic event tracing

On 11/9/2021 11:10 PM, Steven Rostedt wrote:
> On Tue, 9 Nov 2021 23:00:11 +0530
> Sai Prakash Ranjan <quic_saipraka@...cinc.com> wrote:
>
>> Ah that's a very good idea, descriptor does contain the module, file name.
>> We can probably even pass the module name,file name as string from the
>> descriptor itself to event?
>> Perhaps we can do that for all trace events and not just this trace
>> event? Just like the trace event name displayed
>> with trace events, perhaps have file name,module name displayed when
>> dynamic debug is enabled? Filtering by
>> filename is pretty useful since most of these usecases in debugging will
>> be with respect to some driver or subsystems.
> If we add this for all events, it would require a lot of changes to all
> users of tracepoints, as it would require adding a new parameter to the
> callbacks.
>
> We could add a flag in the registering that states that the callback is OK
> for it, and it passes that data as well.
>
> Let me look into this for a bit. I may not have something this week, but
> we should look into this more before adding little hacks that do this one
> at a time like this patch.
>
> -- Steve

Sure, thanks for the help and review. I can skip this patch adding 
support for dynamic event tracing
till we have something concrete as the previous patches doesn't depend 
on this.

Thanks,
Sai