linux-kernel - Re: regression introduced by - timers: fix itimer/many thread hang

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Date:	Thu, 6 Nov 2008 09:03:10 -0600 (CST)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Frank Mayhar <fmayhar@...gle.com>,
	Doug Chapman <doug.chapman@...com>, mingo@...e.hu,
	roland@...hat.com, adobriyan@...il.com, akpm@...ux-foundation.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: regression introduced by - timers: fix itimer/many thread hang

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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