Re: How to invalidate the filesystem buffer cache?

[Andrew Morton <akpm@digeo.com>]

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.