linux-kernel - Re: [RFC, PATCH 1/3] introduce SYS_CLONE

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Message-ID: <20070409173053.GD22997@lnx-holt.americas.sgi.com>
Date:	Mon, 9 Apr 2007 12:30:53 -0500
From:	Robin Holt <holt@....com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Roland McGrath <roland@...hat.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Robin Holt <holt@....com>, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [RFC, PATCH 1/3] introduce SYS_CLONE_MASK

OK.  I just got the OK from management.  The system we were booting was
for research only.  We had NR_CPUS=num_online_cpus()=4096 which were
non-hyperthreaded.  With no attached I/O and the tweak I originally
posted plus one change Jack has already gotten accepted, the machine
booted in approx 12 minutes.

Thanks,
Robin


On Mon, Apr 09, 2007 at 10:20:27AM -0600, Eric W. Biederman wrote:
> Roland McGrath <roland@...hat.com> writes:
> 
> > I concur with Eric's assessment.  Adding new magic bits to the generic
> > clone path seems like a poor way to cope with kernel threads.  I think
> > it's better if kernel thread setup gets less like normal user process
> > setup.  I also agree with Eric that PPID of 0 is a very natural way for
> > kernel threads to be displayed.  We need to know more about the nature
> > of the compatibility issue in procps to judge whether there is good
> > reason to avoid changing it.
> 
> I just investigated the procps issue.  Using init_task as the parent
> nothing sticks out as being wrong in /proc.
> 
> Further when I modified pstree to accept 0 as it's starting pid (from
> which all else would be rooted).  All of the kernel threads showed up.
> 
> So if anything I it is a feature that kernel threads don't show up
> by default in pstree (when PPID == 0).  It isn't a subtle kernel bug.
> 
> Eric
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