RE: [PATCH v2 0/2] x86/delay: Introduce TPAUSE instruction

[Park, Kyung Min]

Hi Thomas,

> -----Original Message-----
> From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Sent: Friday, March 20, 2020 2:57 AM
> To: Park, Kyung Min <kyung.min.park@xxxxxxxxx>; x86@xxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Cc: mingo@xxxxxxxxxx; hpa@xxxxxxxxx; gregkh@xxxxxxxxxxxxxxxxxxx;
> ak@xxxxxxxxxxxxxxx; Luck, Tony <tony.luck@xxxxxxxxx>; Raj, Ashok
> <ashok.raj@xxxxxxxxx>; Shankar, Ravi V <ravi.v.shankar@xxxxxxxxx>; Yu,
> Fenghua <fenghua.yu@xxxxxxxxx>; Park, Kyung Min
> <kyung.min.park@xxxxxxxxx>
> Subject: Re: [PATCH v2 0/2] x86/delay: Introduce TPAUSE instruction
> 
> Hi!
> 
> Kyung Min Park <kyung.min.park@xxxxxxxxx> writes:
> 
> > Intel processors that support the WAITPKG feature implement the TPAUSE
> > instruction that suspends execution in a lower power state until the
> > TSC (Time Stamp Counter) exceeds a certain value.
> >
> > Update the udelay() function to use TPAUSE on systems where it is
> > available. Note that we hard code the deeper (C0.2) sleep state
> > because exit latency is small compared to the "microseconds"
> > that usleep() will delay.
> >
> > ChangeLog:
> > - Change from v1 to v2:
> >   1. The patchset applies after Thomas's cleanup patch as below:
> >      https://lkml.org/lkml/diff/2020/3/18/893/1
> 
> lkml.org is horrible. Please use lore.kernel.org if at all.

Let me change in the next patch.

> Also please just add the patch to the series when posting so that people don't
> have to go through loops and hoops to grab that dependency.

Sure, Let me add this patch to the series.

> Thanks,
> 
>         tglx
>