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Date:	Fri, 14 Dec 2007 14:05:38 -0800
From:	Daniel Phillips <>
To:	Peter Zijlstra <>
Cc:	Linus Torvalds <>,
	Andrew Morton <>,,,,
Subject: Re: [PATCH 04/29] mm: kmem_estimate_pages()

On Friday 14 December 2007 07:39, Peter Zijlstra wrote:
> Provide a method to get the upper bound on the pages needed to
> allocate a given number of objects from a given kmem_cache.
> This lays the foundation for a generic reserve framework as presented
> in a later patch in this series. This framework needs to convert
> object demand (kmalloc() bytes, kmem_cache_alloc() objects) to pages.

And hence the big idea that all reserve accounting can be done in units
of pages, allowing the use of a single global reserve that already 

The other big idea here is that reserve accounting can be independent of 
the actual resource allocations.  This is a powerful idea which we may 
not have explained clearly yet.

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