[rrd-developers] [PATCH] generalisation of rrd_open API

Tobias Oetiker tobi at oetiker.ch
Sat Oct 18 17:56:52 CEST 2008

Hi Daniel,

I think the best would be if you started writing documentation for
the functions you are implementing / planning as well as some general notes
on the design ideas.

To become realy useful, the abstraction may have to be pushed even
further ... keep in minde that as we go to a new cross platform
data format, the on disk structures will change, I would like for
that new abstraction to work with this.


Yesterday Daniel.Pocock at barclayscapital.com wrote:

> I've started generalising the rrd_open API
> The madvise stuff has come out, but it will go back in.  There are a
> couple of options:
> - pass the header size (which is already known) to
> rrd_file->vfs->open_impl, and call madvise once for the whole region
> - add an madvise function to rrd_vfs_t
> Also, the use of #ifndef HAVE_MMAP in rrd_update.c is something I would
> like to remove, only the code in rrd_open.c should have any knowledge of
> the underlying storage.  Maybe we need a function such as
> rrd_file->vfs->is_mmap() to make the decision at run-time instead of
> compile-time.
> This is not ready to commit (although it does seem to run), I am just
> putting it up for discussion.
> Regards,
> Daniel
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Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
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