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. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
