Re: [PATCH] 2/5: Device-mapper: kcopyd

[Alasdair G Kergon]

On Wed, Jun 02, 2004 at 08:41:26PM -0700, Andrew Morton wrote:
> What is the page pool for?

On the I/O path it can't wait for pages to be allocated without 
risking deadlock.  (cf. pvmove in 2.4)


> Why are the pooled pages locked?

I can't see that having any effect (i.e. unnecessary).

 
> > +static int __init jobs_init(void)
> > +	INIT_LIST_HEAD(&_complete_jobs);
> > +	INIT_LIST_HEAD(&_io_jobs);
> > +	INIT_LIST_HEAD(&_pages_jobs);

> Do these lists need to be initialised a second time?

No:-)


Alasdair
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