Re: [PATCH] x86_64, asm: Work around AMD SYSRET SS descriptor attribute issue

From: H. Peter Anvin
Date: Fri Apr 24 2015 - 17:46:04 EST

On 04/24/2015 01:50 PM, Andy Lutomirski wrote:
>> Exactly my feeling. What are you trying to save? About four CPU
>> cycles of checking %ss != __KERNEL_DS on each switch_to?
>> That's not worth bothering about. Your last patch seems to be perfect.
> We'll have to do the write to ss almost every time an AMD CPU sleeps
> in a syscall. Maybe that's still not a big deal.

Once you're sleeping anyway, I don't think so.


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