On Mon, Dec 02, 2002 at 10:07:56AM +0100, Andi Kleen wrote:
> > The data is where I'd say the bloat would be, and lo and behold is a
> > nearly 7-fold increase for the sample you give us _only_ in the .data
> > section.
>
> .data is normally not a significant part of programs, because few programs
> use global variables that heavily (yes, there are exceptions, like that emacs
> thing, but it's not common)
.data is significant, that is e.g. something that cannot be shared
between processes.
The fastest model on x86-64 would IMHO be a 32-bit model using all
registers, rip relative addressing and register passing conventions
(ie. a 3rd ABI).
> > BTW, I bet your dynamic relocation tables are a bit larger too.
>
> Somewhat, but does it matter? They are not kept in memory anyways.
Surely it does, for startup time (unless prelinking) the 3 times bigger .rel*
sections mean significantly more data needs to be loaded into RAM and
caches, for short-lived processes it matters a lot.
Jakub
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Dec 07 2002 - 22:00:12 EST