linux-kernel - Re: [PATCH v3 20/21] dyndbg: add user-flag, negating-flags, and filtering on flags

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Message-ID: <20200619081024.GG3617@alley>
Date:   Fri, 19 Jun 2020 10:10:24 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     jim.cromie@...il.com
Cc:     Jason Baron <jbaron@...mai.com>,
        LKML <linux-kernel@...r.kernel.org>, akpm@...uxfoundation.org,
        Greg KH <gregkh@...uxfoundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Orson Zhai <orson.zhai@...soc.com>,
        Linux Documentation List <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v3 20/21] dyndbg: add user-flag, negating-flags, and
 filtering on flags

On Fri 2020-06-19 09:45:55, Petr Mladek wrote:
> On Thu 2020-06-18 13:11:05, jim.cromie@...il.com wrote:
> > On Thu, Jun 18, 2020 at 12:17 PM Jason Baron <jbaron@...mai.com> wrote:
> > > Yes, I'm wondering as well if people are really going to use the
> > > new flags and filter flags - I mentioned that here:
> > > https://lkml.org/lkml/2020/6/12/732
> > 
> > yes, I saw, and replied there.
> 
> No, the repply only explains how the interface might be used. There is
> no prove that people would actually use it.
> 
> > but since that was v1, and we're on v3, we should refresh.
> > 
> > the central use-case is above, 1-liner version summarized here:
> > 
> > 1- enable sites as you chase a problem with +up
> > 2- examine them with grep =pu
> > 3- change the set to suit, either by adding or subtracting callsites.
> > 4- continue debugging, and changing callsites to suit
> > 5- grep =pu control > ~/debugging-session-task1-callsites
> > 6- echo up-p >control   # disable for now, leave u-set for later
> > 7- do other stuff
> > 8 echo uP+p >control # reactivate useful debug-state and resume
> 
> In short, this feature allows repeatedly enable/disable some
> slowly growing maze of debug messages. Who need this, please? !!!
> 
> If I am debugging then I add/remove debug messages. But I never
> enable/disable all of them repeatedly.

Not to say that I usually need to reboot when I reproduce the problem
and before I could try it again. So all dyndbg flags gets lost
between two tests anyway.

Best Regards,
Petr