Ingo Molnar wrote:
another thing about i386-pda: why did you pick the %gs selector to store
the PDA in? %fs would be a better choice because %gs is used by glibc so
the saving/restoring of %fs would likely be near zero-cycles cost.
(instead of the current 9 cycles for saving/restoring %gs)
Why would saving/restoring %fs be quicker? The main reason I chose %gs
was so that it didn't add anything to the context switch time (since %gs
needed to be switched anyway), and it leaves open the possibility of
using gcc's TLS support in the kernel (I have a working demonstration of
this, but Rusty and I are still working out the module details).
J
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