On Mon, 2007-07-16 at 16:15 -0700, Jeremy Fitzhardinge wrote:
> plain text document attachment (xen-vsyscall-note.patch)
> Add the "nosegneg" fake capabilty to the vsyscall page notes. This is
> used by the runtime linker to select a glibc version which then
> disables negative-offset accesses to the thread-local segment via
> %gs. These accesses require emulation in Xen (because segments are
> truncated to protect the hypervisor address space) and avoiding them
> provides a measurable performance boost.
Hmm, this is still unconditional? Not that it causes any measurable
slowdown when enabled, but ISTR discussing making this dynamic...
Rusty.
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