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

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Date:   Fri, 20 Mar 2020 23:43:56 +0000
From:   "Park, Kyung Min" <kyung.min.park@...el.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "mingo@...hat.com" <mingo@...hat.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "Yu, Fenghua" <fenghua.yu@...el.com>
Subject: RE: [PATCH v2 0/2] x86/delay: Introduce TPAUSE instruction

Hi Thomas,

> -----Original Message-----
> From: Thomas Gleixner <tglx@...utronix.de>
> Sent: Friday, March 20, 2020 2:57 AM
> To: Park, Kyung Min <kyung.min.park@...el.com>; x86@...nel.org; linux-
> kernel@...r.kernel.org
> Cc: mingo@...hat.com; hpa@...or.com; gregkh@...uxfoundation.org;
> ak@...ux.intel.com; Luck, Tony <tony.luck@...el.com>; Raj, Ashok
> <ashok.raj@...el.com>; Shankar, Ravi V <ravi.v.shankar@...el.com>; Yu,
> Fenghua <fenghua.yu@...el.com>; Park, Kyung Min
> <kyung.min.park@...el.com>
> Subject: Re: [PATCH v2 0/2] x86/delay: Introduce TPAUSE instruction
> 
> Hi!
> 
> Kyung Min Park <kyung.min.park@...el.com> 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
>