Re: [v4 0/3] Reduce TLB flushes under some specific conditions

[Byungchul Park]

On Thu, Nov 09, 2023 at 06:26:08AM -0800, Dave Hansen wrote:
> On 11/8/23 20:59, Byungchul Park wrote:
> > Can you believe it? I saw the number of TLB full flush reduced about
> > 80% and iTLB miss reduced about 50%, and the time wise performance
> > always shows at least 1% stable improvement with the workload I tested
> > with, XSBench. However, I believe that it would help more with other
> > ones or any real ones. It'd be appreciated to let me know if I'm missing
> > something.
> 
> I see that you've moved a substantial amount of code out of arch/x86.
> That's great.
> 
> But there doesn't appear to be any improvement in the justification or
> performance data.  The page flag is also here, which is horribly frowned
> upon.  It's an absolute no-go with this level of justification.
> 
> I'd really suggest not sending any more of these out until those issues
> are rectified.  I know I definitely won't be reviewing them in this state.

Make sense. Lemme think it more and improve it.

	Byungchul