linux-kernel - Re: [PATCH] sysrq: showBlockedTasks is sysrq-W

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Message-Id: <20070106120436.6f0a3aa3.randy.dunlap@oracle.com>
Date:	Sat, 6 Jan 2007 12:04:36 -0800
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Torsten Kaiser <tk13@...dioc.dyndns.org>
Cc:	Olaf Hering <olaf@...fle.de>, lkml <linux-kernel@...r.kernel.org>,
	akpm <akpm@...l.org>
Subject: Re: [PATCH] sysrq: showBlockedTasks is sysrq-W

On Sat, 6 Jan 2007 20:19:29 +0100 Torsten Kaiser wrote:

> On Saturday 06 January 2007 19:25, Randy Dunlap wrote:
> > On Fri, 5 Jan 2007 20:36:05 +0100 Olaf Hering wrote:
> > >
> > > Weird, who failed to run this command before adding new stuff?!
> > > find * -type f -print0 | xargs -0 env -i grep -nw register_sysrq_key
> > >
> > > sysrq x is for xmon, see arch/powerpc/xmon/xmon.c
> > > Better switch the new stuff to 'z' or 'w'
> 
> Also used: 
> * c for kexec/crashdump and emac (drivers/net/ibm_emac/ibm_emac_debug.c)

ibm_emac is ppc 4xx only.  Does kexec/crashdump work on that
platform or are they mutually exclusive?

> * g for KGDB on ppc

Is that in mainline?


> > From: Randy Dunlap <randy.dunlap@...cle.com>
> >
> > SysRq showBlockedTasks is not done via B or T, it's done via W,
> > so put that in the Help message.
> >
> > It was previously done via X, but X is already used for Xmon
> > on powerpc platforms and this collision needs to be avoided.
> 
> > @@ -342,8 +342,8 @@ static struct sysrq_key_op *sysrq_key_ta
> >  	&sysrq_mountro_op,		/* u */
> >  	/* May be assigned at init time by SMP VOYAGER */
> >  	NULL,				/* v */
> 
> Nice marker that v is in use.
> 
> > -	NULL,				/* w */
> > -	&sysrq_showstate_blocked_op,	/* x */
> > +	&sysrq_showstate_blocked_op,	/* w */
> > +	NULL,				/* x */
> 
> Wouldn't it be better to also put an marker for xmon here?
> And marker for 'c' and 'g' (maybe even 'h')?

OK, I'll do that.

> >  	NULL,				/* y */
> >  	NULL				/* z */
> >  };
> 
> Also Documentation/sysrq.txt is not uptodate.
> 
> It is missing c (emac meaning), d (lockdep), n (un-RT), q (timer), w 
> (blocked) and x (xmon), but is documenting 'l' with no longer seems to be 
> implemented.

and I'll look into that.  Thanks.

---
~Randy
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