linux-kernel - Re: + sched-use-tasklet-to-call-balancing.patch added to -mm tree

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Message-ID: <20061107202943.GA4753@elte.hu>
Date:	Tue, 7 Nov 2006 21:29:43 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Christoph Lameter <clameter@....com>
Cc:	"Siddha, Suresh B" <suresh.b.siddha@...el.com>, akpm@...l.org,
	mm-commits@...r.kernel.org, nickpiggin@...oo.com.au,
	linux-kernel@...r.kernel.org
Subject: Re: + sched-use-tasklet-to-call-balancing.patch added to -mm tree


* Christoph Lameter <clameter@....com> wrote:

> On Tue, 7 Nov 2006, Siddha, Suresh B wrote:
> 
> > Christoph, DECLARE_TASKLET that you had atleast needs to be per 
> > cpu.. Not sure if there are any other concerns.
> 
> Nope. Tasklets scheduled and executed per cpu. These are the former 
> bottom halves. See tasklet_schedule in kernel/softirq.c

no, they are "task"-lets. Softirqs are the equivalent of former 
bottom-halves.

a tasklet may run on any CPU but its execution is globally serialized - 
it's not what we want to do in the scheduler.

	Ingo
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