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

kevin brintnall kbrint at rufus.net
Fri Oct 17 16:55:22 CEST 2008

On Fri, Oct 17, 2008 at 03:49:41PM +0100, Daniel.Pocock at barclayscapital.com wrote:
> 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

Taking it out, even temporarily, doesn't seem like that good of an idea to
me.  You're targeting large installations, which need madvise/fadvise very

 kevin brintnall =~ /kbrint at rufus.net/

> 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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