Date: Thu, 6 Nov 2008 09:03:10 -0600 (CST)
From: Christoph Lameter <cl@linux-foundation.org>
To: Peter Zijlstra <peterz@infradead.org>
cc: Frank Mayhar <fmayhar@google.com>, Doug Chapman <doug.chapman@hp.com>,
       mingo@elte.hu, roland@redhat.com, adobriyan@gmail.com,
       akpm@linux-foundation.org, linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: regression introduced by - timers: fix itimer/many thread hang
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On Thu, 6 Nov 2008, Peter Zijlstra wrote:

> Also, you just introduced per-cpu allocations for each thread-group,
> while Christoph is reworking the per-cpu allocator, with one unfortunate
> side-effect - its going to have a limited size pool. Therefore this will
> limit the number of thread-groups we can have.

Patches exist that implement a dynamically growable percpu pool (using
virtual mappings though). If the cost of the additional complexity /
overhead is justifiable then we can make the percpu pool dynamically
extendable.

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