linux-kernel - Re: Efficient Use of the Page Cache with 64 KB Pages

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Date:	Fri, 15 Sep 2006 11:11:28 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Sandeep Kumar <sandeepksinha@...il.com>
Cc:	linux-kernel@...r.kernel.org, Dave Kleikamp <shaggy@...tin.ibm.com>
Subject: Re: Efficient Use of the Page Cache with 64 KB Pages

On Fri, 2006-09-15 at 01:50 -0700, Sandeep Kumar wrote:
> Hey all,
> I am a newbie and I just read a document with the idea for changes in
> page cache management for 64 Bit machines. This has been taken from
> Linux symposium 2006, ottawa.
> 
> In order for 64-bit processors to efficiently use large address spaces
> while maintaining lower TLB miss rates, the Linux kernel can be
> configured with base page sizes up to 64 KB. While this benefits
> access to large memory segments and files, it greatly reduces the
> number of smaller files that can be resident in memory at one time.
> The idea proposes a change to the Linux kernel to allow file data to
> be more efficiently stored in memory when the size of the file, or the
> data at the end of a file, is significantly smaller than the page
> size.
> 
> So, how far is this feature feasible for the linux main line kernel ?

Not in the form last presented, but Dave is still working on making it
look pretty and covering more use-cases AFAIK.

But even then, it will not fix all scenarios...

> Is, this feature already supported ?

No it is not. 

In future it would be nice to add the author(s) to the CC list ;-)

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