Re: New module proposal: tracker

[Lennart Poettering <mztabzr 0pointer de>]

On Fri, 06.11.09 20:22, Alexander Larsson (alexl redhat com) wrote:

> There is one problem with POSIX_FADV_DONTNEED. If you do it on a file
> the kernel will drop it from its caches. This is generally what you want
> if you just indexed a 100 meg text file that no other app cares about
> atm, since it means we won't throw out 100 megs of otherwise useful
> caches. However, if you're reading a file that some other app actually
> cares about this may be a problem, since you're now ensuring that the
> file has to be re-read the next time that app wants to use the file. Not
> sure if there is a better way though...

Shoudln't MADV_SEQUENTIAL do this? Enables aggressive read-ahead and
quick freeing according to the man page. Not sure though if the latter
is actually implemented by the VM in the way we'd want it here.

Lennart

-- 
Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net
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