linux-kernel - RE: [PATCH] ath10k: Add history for tracking certain events

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Date:   Thu, 16 Jul 2020 17:18:22 +0530
From:   "Rakesh Pillai" <pillair@...eaurora.org>
To:     "'Ben Greear'" <greearb@...delatech.com>,
        <ath10k@...ts.infradead.org>
Cc:     <linux-wireless@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] ath10k: Add history for tracking certain events



> -----Original Message-----
> From: Ben Greear <greearb@...delatech.com>
> Sent: Sunday, June 28, 2020 10:56 PM
> To: Rakesh Pillai <pillair@...eaurora.org>; ath10k@...ts.infradead.org
> Cc: linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH] ath10k: Add history for tracking certain events
> 
> 
> 
> On 06/27/2020 10:12 PM, Rakesh Pillai wrote:
> >
> >
> >> -----Original Message-----
> >> From: Ben Greear <greearb@...delatech.com>
> >> Sent: Saturday, June 27, 2020 8:58 PM
> >> To: Rakesh Pillai <pillair@...eaurora.org>; ath10k@...ts.infradead.org
> >> Cc: linux-wireless@...r.kernel.org; linux-kernel@...r.kernel.org
> >> Subject: Re: [PATCH] ath10k: Add history for tracking certain events
> >>
> >>
> >>
> >> On 06/26/2020 11:22 PM, Rakesh Pillai wrote:
> >>> For debugging many issues, a history of the
> >>> below mentioned events can help get an idea
> >>> of what exactly was going on just before any
> >>> issue occurred in the system. These event
> >>> history will be collected only when the host
> >>> driver is run in debug mode (i.e. with the
> >>> config ATH10K_DEBUG enabled).
> >>
> >> This should be disabled by default unless user specifically pokes some
> >> debugfs
> >> value to turn it on so that it does not impact performance.
> >
> > Hi Ben,
> > This history is enabled only if the user compiles the kernel with
> > ATH10K_DEBUG.
> > Making it runtime, adds a lot of "if" conditions for this history
record.
> > Do you suggest to add support to enable/disable it runtime even in
> > ATH10K_DEBUG ?
> 
> Yes, because you are adding lots of locks/unlocks.  That is way more
> expensive
> than an if statement.  You can add an 'unlikely' to the if check as well,
so
> compiler will optimize for this feature not being enabled.


Hi Ben,
I missed this mail somehow.
Yes sure, I will make the necessary changes and upload a new patchset.

Thanks,
Rakesh Pillai.


> 
> Thanks,
> Ben
> 
> >
> >>
> >> Thanks,
> >> Ben
> >>
> >>>
> >>> Add history for tracking the below events
> >>> - register read
> >>> - register write
> >>> - IRQ trigger
> >>> - IRQ Enable
> >>> - IRQ Disable
> >>> - NAPI poll
> >>> - CE service
> >>> - WMI cmd
> >>> - WMI event
> >>> - WMI tx completion
> >>>
> >>> This will help in debugging any crash or any
> >>> improper behaviour.
> >>
> >>
> >> --
> >> Ben Greear <greearb@...delatech.com>
> >> Candela Technologies Inc  http://www.candelatech.com
> >
> 
> --
> Ben Greear <greearb@...delatech.com>
> Candela Technologies Inc  http://www.candelatech.com