linux-kernel - Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

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Message-ID: <Pine.LNX.4.64.0706081534520.3966@schroedinger.engr.sgi.com>
Date:	Fri, 8 Jun 2007 15:36:01 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Andreas Kleen <ak@...e.de>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	linux-kernel@...r.kernel.org, gregkh@...e.de, muli@...ibm.com,
	asit.k.mallick@...el.com, suresh.b.siddha@...el.com,
	arjan@...ux.intel.com, ashok.raj@...el.com, shaohua.li@...el.com,
	davem@...emloft.net
Subject: Re: [Intel-IOMMU 02/10] Library routine for pre-allocat pool handling

On Fri, 8 Jun 2007, Andreas Kleen wrote:

> > That's what kmem_cache_alloc() is for?!?!
> 
> Tradtionally that was not allowed in block layer path. Not sure
> it is fully obsolete with the recent dirty tracking work, probably not.

Why was it not allowed? Because interrupts are disabled?

> Besides it would need to be GFP_ATOMIC and the default
> atomic pools are not that big.

Those could be increased. I think Mel has them already increased in mm.
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