binary Hardening on linux using Relocation Read-Only (relro)

[Florian Weimer]

* Matthias Baesken:

> For "-Wl,-z,now" some startup performance hits are mentioned in
> articles/blogs - any experiences / performance-measurements with this
> in the OpenJDK context ?

While libjvm.so needs a staggering amount of relocations, most of them
are relative.  They are not eligible for lazy binding, and they have to
be performed at startup even without BIND_NOW.

That being said, relocation processing for libjvm.so adds a couple of
milliseconds to startup, and it looks like their number is growing with
each release.

Thanks,
Florian