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| author | Jeremy Fitzhardinge <jeremy@xensource.com> | 2007-07-17 18:37:04 -0700 |
|---|---|---|
| committer | Jeremy Fitzhardinge <jeremy@goop.org> | 2007-07-18 08:47:42 -0700 |
| commit | 24037a8b69dbf15bfed8fd42a2a2e442d7b0395b (patch) | |
| tree | 317e7d21bd253200aa09a7b1551d03c1e3985cc0 /arch/i386/kernel/entry.S | |
| parent | 688340ea34c61ad12473ccd837325b59aada9a93 (diff) | |
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 <ian.pratt@xensource.com>
Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Acked-by: Zachary Amsden <zach@vmware.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: Ulrich Drepper <drepper@redhat.com>
Diffstat (limited to 'arch/i386/kernel/entry.S')
0 files changed, 0 insertions, 0 deletions