linux-kernel - Re: [RESEND PATCH] x86/vdso: Handle clock_gettime(CLOCK

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Date:   Fri, 31 Aug 2018 20:45:31 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Matthew Rickard <matt@...trans.com.au>
cc:     Andy Lutomirski <luto@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        John Stultz <john.stultz@...aro.org>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH] x86/vdso: Handle clock_gettime(CLOCK_TAI) in
 vDSO

On Wed, 29 Aug 2018, Matthew Rickard wrote:

> Here are the before and after times with CONFIG_RETPOLINE=y always on.
> I don't see any regression, just the hoped-for improvement on glibc and
> vDSO calls of CLOCK_TAI.
> 
> Before:
>        sec Timestamp                   nanos clockname    tzname type
> ---------- --------------------------- ----- --------- --------- -------
> 1535445844 2018/08/28 08:44:04.338599419  96 CLOCK_REALTIME  UTC 0 glibc
> 1535445844 2018/08/28 08:44:04.348494684  87 CLOCK_REALTIME  UTC 1 vdso
> 1535445844 2018/08/28 08:44:04.357328913 321 CLOCK_REALTIME  UTC 2 sys
> 1535445834 2018/08/28 08:43:27.507099055 233 CLOCK_TAI right/UTC 0 glibc
> 1535445834 2018/08/28 08:43:27.530666383 239 CLOCK_TAI right/UTC 1 vdso
> 1535445834 2018/08/28 08:43:27.554827262 389 CLOCK_TAI right/UTC 2 sys
>         80 1970/01/01 00:01:20.593942210  88 CLOCK_MONOTONIC UTC 0 glibc
>         80 1970/01/01 00:01:20.602866312  84 CLOCK_MONOTONIC UTC 1 vdso
>         80 1970/01/01 00:01:20.611322392 272 CLOCK_MONOTONIC UTC 2 sys
>         80 1970/01/01 00:01:20.638630685 298 CLOCK_BOOTTIME  UTC 0 glibc
>         80 1970/01/01 00:01:20.668487920 293 CLOCK_BOOTTIME  UTC 1 vdso
>         80 1970/01/01 00:01:20.697818847 279 CLOCK_BOOTTIME  UTC 2 sys
> 
> After yours and my patches:
>        sec Timestamp                   nanos clockname    tzname type
> ---------- --------------------------- ----- --------- --------- -------
> 1535466985 2018/08/28 14:36:25.483377529  93 CLOCK_REALTIME  UTC 0 glibc
> 1535466985 2018/08/28 14:36:25.493020681  89 CLOCK_REALTIME  UTC 1 vdso
> 1535466985 2018/08/28 14:36:25.502139080 282 CLOCK_REALTIME  UTC 2 sys
> 1535466975 2018/08/28 14:35:48.530621935  87 CLOCK_TAI right/UTC 0 glibc
> 1535466975 2018/08/28 14:35:48.539393751  81 CLOCK_TAI right/UTC 1 vdso
> 1535466975 2018/08/28 14:35:48.547693183 276 CLOCK_TAI right/UTC 2 sys
>        224 1970/01/01 00:03:44.575542852  87 CLOCK_MONOTONIC UTC 0 glibc
>        224 1970/01/01 00:03:44.584329822  81 CLOCK_MONOTONIC UTC 1 vdso
>        224 1970/01/01 00:03:44.592473982 269 CLOCK_MONOTONIC UTC 2 sys
>        224 1970/01/01 00:03:44.619450784 296 CLOCK_BOOTTIME  UTC 0 glibc
>        224 1970/01/01 00:03:44.649224430 312 CLOCK_BOOTTIME  UTC 1 vdso
>        224 1970/01/01 00:03:44.680600544 297 CLOCK_BOOTTIME  UTC 2 sys

Can you please send a V3 with that information (condensed) in the
changelog?

Thanks,

	tglx