Subject: Re: suspend blockers & Android integration
From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: tytso@mit.edu, Brian Swetland <swetland@google.com>,
       Neil Brown <neilb@suse.de>, Arve Hj?nnev?g <arve@android.com>,
       Thomas Gleixner <tglx@linutronix.de>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       Alan Stern <stern@rowland.harvard.edu>,
       Felipe Balbi <felipe.balbi@nokia.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Florian Mickler <florian@mickler.org>,
       Linux OMAP Mailing List <linux-omap@vger.kernel.org>,
       Linux PM <linux-pm@lists.linux-foundation.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       James Bottomley <James.Bottomley@suse.de>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Kevin Hilman <khilman@deeprootsystems.com>,
       "H. Peter Anvin" <hpa@zytor.com>,
       Arjan van de Ven <arjan@infradead.org>
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Date: Fri, 04 Jun 2010 12:08:23 +0200
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On Fri, 2010-06-04 at 12:03 +0200, Ingo Molnar wrote:

> > The only 'interesting' issue I can see here is that if you create 1000 
> > CLOCK_MONOTONIC namepaces, we'd need to have a tree of trees in order to 
> > efficiently find the leftmost timer.
> 
> Realistically Android userspace would create just a single such namespace for 
> all the untrusted/unknown/uncontrolled apps, right?

Possibly, yeah. 

But it might not stop someone else from create an insane amount of them.
So we do need to deal with that, and a linear loop over all timer bases,
which then will be a user controlled quantity, just doesn't sound
right :-)
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