Add nosegneg capability to the vsyscall page notes

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.

Signed-off-by: Ian Pratt <[email protected]>
Signed-off-by: Christian Limpach <[email protected]>
Signed-off-by: Chris Wright <[email protected]>
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Acked-by: Zachary Amsden <[email protected]>
Cc: Roland McGrath <[email protected]>
Cc: Ulrich Drepper <[email protected]>

0 files changed, 0 insertions, 0 deletions