linux-kernel - Re: [RFC PATCH 1/6] testing/pkeys: Add command line options

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Date:   Mon, 13 Jun 2022 16:41:35 -0700
From:   Ira Weiny <ira.weiny@...el.com>
To:     Sohil Mehta <sohil.mehta@...el.com>
CC:     <linux-api@...r.kernel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        <x86@...nel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-kselftest@...r.kernel.org>
Subject: Re: [RFC PATCH 1/6] testing/pkeys: Add command line options

On Mon, Jun 13, 2022 at 03:31:02PM -0700, Mehta, Sohil wrote:
> On 6/10/2022 4:35 PM, ira.weiny@...el.com wrote:
> 
> > Add command line options for debug level and number of iterations.
> > 
> > $ ./protection_keys_64 -h
> > Usage: ./protection_keys_64 [-h,-d,-i <iter>]
> >          --help,-h   This help
> > 	--debug,-d  Increase debug level for each -d
> 
> Is this mechanism (of counting d's) commonplace in other selftests as well?
> Looking at the test code for pkeys the debug levels run from 1-5. That feels
> like quite a few d's to input :)

I've seen (and used) it before yes.  See ibnetdiscover.

...
# Debugging flags
-d raise the IB debugging level. May be used several times (-ddd or -d -d -d).
...
-v increase the application verbosity level. May be used several times (-vv or -v -v -v)
...
	- https://linux.die.net/man/8/ibnetdiscover

But a much more mainstream example I can think of is verbosity level with
lspci.

16:29:12 > lspci -h
...
Display options:
-v              Be verbose (-vv or -vvv for higher verbosity)
...

> 
> Would it be easier to input the number in the command line directly?
> 
> Either way it would be useful to know the debug range in the help.
> Maybe something like:
> 	--debug,-d  Increase debug level for each -d (1-5)

I'm inclined not to do this because it would encode the max debug level.  On
the other hand I'm not sure why there are 5 levels now.  ;-)

Having the multiple options specified was an easy way to maintain the large
number of levels.

Ira

> 
> The patch seems fine to me otherwise.
> 
> > 	--iterations,-i <iter>  repeate test <iter> times
> > 		default: 22
> > 
> 
> Thanks,
> Sohil