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Date: Wed, 20 Nov 2002 18:42:15 -0800
From: Andrew Morton <akpm@digeo.com>
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To: Mark Atwood <mra@pobox.com>
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Subject: Re: How to invalidate the filesystem buffer cache?
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Mark Atwood wrote:
> 
> Like the question says, is there a way to invalidate the whole buffer
> cache at once?
> 

"There is no buffer cache".

There's a pagecache, which caches the contents of files and block devices.
You can invalidate the block device pagecache with `blockdev --flushbufs' but
there is no interface for invalidating the pagecache of regular files.

Allocating and then freeing a ton of anonymous memory, then running a
swapoff/swapon cycle might suit.
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