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Date: Wed, 11 Mar 2009 13:28:31 -0400 (EDT)
From: Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [Bug 12832] New: kernel leaks a lot of memory
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To: Pierre Ossman <drzeus@drzeus.cx>
Cc: Wu Fengguang <fengguang.wu@intel.com>, Andrew Morton <akpm@linux-foundation.org>, "bugme-daemon@bugzilla.kernel.org" <bugme-daemon@bugzilla.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Ingo Molnar <mingo@elte.hu>
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On Wed, 11 Mar 2009, Pierre Ossman wrote:

> On Wed, 11 Mar 2009 10:25:10 -0400 (EDT)
> Steven Rostedt <rostedt@goodmis.org> wrote:
> 
> > 
> > The ring buffer is allocated at start up (although I'm thinking of making 
> > it allocated when it is first used), and the allocations are done percpu. 
> > 
> > It allocates around 3 megs per cpu. How many CPUs were on this box?
> > 
> 
> Is this per actual CPU though? Or per CONFIG_NR_CPUS? 3 MB times 64
> equals roughly the lost memory. But then again, you said it was 10 MB
> per CPU for 2.6.27...

It uses the possible_cpu mask. How many possible CPUs are on your box? 
I've thought about making this handle hot plug CPUs, but that will
require a little more overhead for everyone, whether or not you hot plug a 
cpu.

-- Steve

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