linux-kernel - Re: [BUG?] false positive in soft lockup detector while unlzma initramfs on slow cpu

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Message-ID: <20130131111823.GA4587@gmail.com>
Date:	Thu, 31 Jan 2013 12:18:23 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Don Zickus <dzickus@...hat.com>, Mike Lykov <combr@...dex.ru>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org,
	kirill@...temov.name
Subject: Re: [BUG?] false positive in soft lockup detector while unlzma
 initramfs on slow cpu


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Tue, 29 Jan 2013 10:33:48 -0500
> Don Zickus <dzickus@...hat.com> wrote:
> 
> > --- a/kernel/watchdog.c
> > +++ b/kernel/watchdog.c
> > @@ -79,6 +79,14 @@ static int __init softlockup_panic_setup(char *str)
> >  }
> >  __setup("softlockup_panic=", softlockup_panic_setup);
> >  
> > +static int __init watchdog_thresh_setup(char *str)
> > +{
> > +	watchdog_thresh = simple_strtoul(str, NULL, 0);
> > +
> > +	return 1;
> > +}
> > +__setup("watchdog_thresh=", watchdog_thresh_setup);
> 
> I wonder if there's some magical way in which we can set any 
> sysctl from the kernel command line.  Add 
> sys.vm.min_free_kbytes=42 to the command line, walk the 
> hierarchy late in boot...

A facility like that would be totally awesome - we could remove 
a lot of duplicated and outright inconsistent (often missing) 
__setup() hackery that way.

Single source of information and all that.

Thanks,

	Ingo
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