linux-kernel - Re: [PATCH 12/35] workqueue: update cwq alignement

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Date:	Tue, 6 Jul 2010 09:22:22 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Tejun Heo <tj@...nel.org>
cc:	Frederic Weisbecker <fweisbec@...il.com>,
	torvalds@...ux-foundation.org, mingo@...e.hu,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	akpm@...ux-foundation.org, rusty@...tcorp.com.au,
	dhowells@...hat.com, arjan@...ux.intel.com, oleg@...hat.com,
	axboe@...nel.dk, dwalker@...eaurora.org, stefanr@...6.in-berlin.de,
	florian@...kler.org, andi@...stfloor.org, mst@...hat.com,
	randy.dunlap@...cle.com
Subject: Re: [PATCH 12/35] workqueue: update cwq alignement

On Tue, 29 Jun 2010, Tejun Heo wrote:

> What alignment maintenance?  Are you talking about the UP code?  If
> you're talking about the UP code, the ugliness there is because the
> current UP __alloc_percpu() can't honor the alignment parameter.

Why do we need alignment on UP? Cachelines typically dont bounce if a
single processor accesses the data.

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