Re: [PATCH v5 8/9] x86-64: Emulate legacy vsyscalls

[Andi Kleen]

There's clear evidence that any kind of exception in gettimeofday()/time()
is too slow. A few years ago gtod() had CPUID which lead to intercepts
with many hypervisors. This turned out to be a unacceptable slowdown,
so it was fixed,

A pagefault is a bit faster than a virtualization intercept, but not
much and therefore too slow.

-Andi
-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/