linux-kernel - Re: [PATCH 2/5] dyndbg: refine verbosity 1-4 summary-detail

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Message-ID: <YWbTsfXB7mq/z7qq@kroah.com>
Date:   Wed, 13 Oct 2021 14:40:17 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Jim Cromie <jim.cromie@...il.com>
Cc:     jbaron@...mai.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dyndbg: refine verbosity 1-4 summary-detail

On Tue, Oct 12, 2021 at 12:33:07PM -0600, Jim Cromie wrote:
> adjust current v*pr_info() calls to fit an overview..detail scheme:
> 
> -1 module level activity: add/remove, etc
> -2 command ingest, splitting, summary of effects.
>    per >control write
> -3 command parsing, 6 vpr-infos changed to this.
> -4 per-site change - was v2, too noisy there.
>    can yield 3k logs per command.
> 
> -2 is new, to isolate a problem where a stress-test script (which
> feeds large multi-command strings) would produce short writes,
> truncating last command and causing parsing errors, which confused
> test results.  The 1st fix was to use syswrite in the script, to
> deliver full proper commands.
> 
> -4 gets per-callsite "changed:" pr-infos, which are very noisy during
> stress tests, and formerly obscured v1-3 messages, and dominated the
> static-key workload being tested.
> 
> The verbose parameter has previously seen adjustment:
> commit 481c0e33f1e7 ("dyndbg: refine debug verbosity; 1 is basic, 2 more chatty")
> 
> Signed-off-by: Jim Cromie <jim.cromie@...il.com>

Where is this being documented?  How do we know what these different
"levels" mean?

thanks,

greg k-h