Jeremy Fitzhardinge wrote:
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]>
Acked-by: Zachary Amsden <[email protected]>
We would like to see this by dynamic, but that is much more difficult to
achieve, and seeing your recent linker issues, I don't think this should
gate merging this code. The performance loss for us I believe to be
negligible, and the fix is quite a bit more complicated than something
achievable in the .21 timeframe.
Zach
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