Re: [PATCH 3/4] x86: Rewrite switch_to() code

[Brian Gerst]

On Wed, Jun 15, 2016 at 4:03 AM, Ingo Molnar <mingo@xxxxxxxxxx> wrote:
>
> * Andy Lutomirski <luto@xxxxxxxxxxxxxx> wrote:
>
>> On Sat, May 21, 2016 at 9:04 AM, Brian Gerst <brgerst@xxxxxxxxx> wrote:
>>
>> > Move the low-level context switch code to an out-of-line asm stub instead of
>> > using complex inline asm.  This allows constructing a new stack frame for the
>> > child process to make it seamlessly flow to ret_from_fork without an extra
>> > test and branch in __switch_to().  It also improves code generation for
>> > __schedule() by using the C calling convention instead of clobbering all
>> > registers.
>>
>> Just a heads up: I'm writing some code that conflicts with this patch. The
>> conflict will be easy to resolve, and, if this patch beats mine to -tip, I'll
>> rebase.
>
> So I was expecting another iteration of this switch_to() series, but had no
> fundamental objections to the concept.

I'll have it ready soon.  I've just been busy with other things lately.

--
Brian Gerst