From: Nathan_Lynch@mentor•com (Nathan Lynch)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v7 0/9] ARM: VDSO
Date: Tue, 1 Jul 2014 11:34:25 -0500 [thread overview]
Message-ID: <53B2E311.6030609@mentor.com> (raw)
In-Reply-To: <CAKv+Gu87_5Fx=z6Kg3EBi7YTm+f9DpiaZVw_UU9xKZD1MoJW8w@mail.gmail.com>
On 06/30/2014 03:12 AM, Ard Biesheuvel wrote:
> On 23 June 2014 05:11, Nathan Lynch <nathan_lynch@mentor•com> wrote:
>> Provide fast userspace implementations of gettimeofday and
>> clock_gettime on systems that implement the generic timers extension
>> defined in ARMv7.
...
> Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro•org>
>
> On Exynos-5250 (Cortex-A15):
>
> clock-gettime-monotonic system calls per second: 1759517
> clock-gettime-monotonic vdso calls per second: 6027915 (3.43x speedup)
> clock-getres-monotonic system calls per second: 2144055
> clock-getres-monotonic vdso calls per second: 82783103 (38.61x speedup)
> clock-gettime-monotonic-coarse system calls per second: 1971433
> clock-gettime-monotonic-coarse vdso calls per second: 10710734 (5.43x speedup)
> clock-getres-monotonic-coarse system calls per second: 2182380
> clock-getres-monotonic-coarse vdso calls per second: 76710594 (35.15x speedup)
> clock-gettime-realtime system calls per second: 1722524
> clock-gettime-realtime vdso calls per second: 6309212 (3.66x speedup)
> clock-getres-realtime system calls per second: 2182357
> clock-getres-realtime vdso calls per second: 83120713 (38.09x speedup)
> clock-gettime-realtime-coarse system calls per second: 2085498
> clock-gettime-realtime-coarse vdso calls per second: 11326069 (5.43x speedup)
> clock-getres-realtime-coarse system calls per second: 2178266
> clock-getres-realtime-coarse vdso calls per second: 76731175 (35.23x speedup)
> Note: vDSO version of getcpu not found
> getcpu system calls per second: 2645300
> getcpu vdso calls per second: 2612154 (0.99x speedup)
> Note: vDSO version of getcpu not found
> Note: vDSO version of getcpu not found
> gettimeofday system calls per second: 1707745
> gettimeofday vdso calls per second: 6474501 (3.79x speedup)
Thank you very much for testing (especially on a platform I don't have).
These results match up with what I get on OMAP5 (also Cortex-A15).
Since it looks like I will need to make some significant changes for the
next version, I think I can't in good conscience carry your Tested-by on
to v8 (although I'm open to different opinions). But I still very much
appreciate it.
next prev parent reply other threads:[~2014-07-01 16:34 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-23 3:11 [PATCH v7 0/9] ARM: VDSO Nathan Lynch
2014-06-23 3:11 ` [PATCH v7 1/9] clocksource: arm_arch_timer: change clocksource name if CP15 unavailable Nathan Lynch
2014-06-23 3:11 ` [PATCH v7 2/9] clocksource: arm_arch_timer: enable counter access for 32-bit ARM Nathan Lynch
2014-06-23 3:11 ` [PATCH v7 3/9] ARM: arch_timer: remove unused functions Nathan Lynch
2014-06-23 3:11 ` [PATCH v7 4/9] arm64: " Nathan Lynch
2014-06-23 3:11 ` [PATCH v7 5/9] ARM: place sigpage at a random offset above stack Nathan Lynch
2014-06-23 3:11 ` [PATCH v7 6/9] ARM: miscellaneous vdso infrastructure, preparation Nathan Lynch
2014-06-30 10:11 ` Arnd Bergmann
2014-06-30 12:27 ` Nathan Lynch
2014-06-30 13:06 ` Arnd Bergmann
2014-06-23 3:11 ` [PATCH v7 7/9] ARM: add vdso user-space code Nathan Lynch
2014-06-28 9:53 ` Russell King - ARM Linux
2014-06-28 10:03 ` Russell King - ARM Linux
2014-06-30 15:56 ` Andy Lutomirski
2014-06-28 15:19 ` Nathan Lynch
2014-06-28 15:26 ` Russell King - ARM Linux
2014-06-28 16:13 ` Nathan Lynch
2014-06-28 18:12 ` Russell King - ARM Linux
2014-06-28 19:45 ` Nathan Lynch
2014-06-28 20:11 ` Russell King - ARM Linux
2014-06-28 21:35 ` Nathan Lynch
2014-06-29 8:34 ` Russell King - ARM Linux
2014-06-29 15:48 ` Nathan Lynch
2014-06-29 16:07 ` Russell King - ARM Linux
2014-06-29 23:04 ` Nathan Lynch
2014-06-30 21:33 ` Andy Lutomirski
2014-06-30 15:59 ` Andy Lutomirski
2014-06-30 16:50 ` Nathan Lynch
2014-06-30 21:29 ` Andy Lutomirski
2014-07-01 9:00 ` Will Deacon
2014-07-01 13:34 ` Nathan Lynch
2014-07-01 14:11 ` Andy Lutomirski
2014-07-01 13:28 ` Nathan Lynch
2014-07-01 14:56 ` Andy Lutomirski
2014-06-23 3:11 ` [PATCH v7 8/9] ARM: vdso initialization, mapping, and synchronization Nathan Lynch
2014-06-30 21:37 ` Andy Lutomirski
2014-07-01 9:03 ` Will Deacon
2014-07-01 14:11 ` Nathan Lynch
2014-07-01 14:15 ` Will Deacon
2014-07-01 14:17 ` Andy Lutomirski
2014-07-01 17:27 ` Christopher Covington
2014-07-02 14:40 ` Will Deacon
2014-07-02 15:54 ` Andy Lutomirski
2014-07-02 16:18 ` Nathan Lynch
2014-07-02 16:27 ` Will Deacon
2014-07-02 16:47 ` Andy Lutomirski
2014-07-02 17:24 ` Will Deacon
2014-07-02 18:34 ` Andy Lutomirski
2014-07-02 18:54 ` Will Deacon
2014-07-22 0:14 ` Andy Lutomirski
2014-07-22 8:13 ` Will Deacon
2014-07-01 14:01 ` Nathan Lynch
2014-07-01 14:09 ` Andy Lutomirski
2014-07-01 14:14 ` Russell King - ARM Linux
2014-06-23 3:11 ` [PATCH v7 9/9] ARM: add CONFIG_VDSO Kconfig and Makefile bits Nathan Lynch
2014-06-27 8:51 ` [PATCH v7 0/9] ARM: VDSO Jan Glauber
2014-06-27 8:57 ` Russell King - ARM Linux
2014-06-27 9:41 ` Ard Biesheuvel
2014-06-27 9:46 ` Russell King - ARM Linux
2014-06-27 17:01 ` Nathan Lynch
2014-06-28 9:42 ` Russell King - ARM Linux
2014-06-28 9:55 ` Russell King - ARM Linux
2014-06-28 14:49 ` Russell King - ARM Linux
2014-06-30 7:27 ` Arnd Bergmann
2014-06-30 7:43 ` Arnd Bergmann
2014-06-30 18:27 ` Nathan Lynch
2014-06-27 16:00 ` Nathan Lynch
2014-06-30 16:03 ` Andy Lutomirski
2014-06-30 8:12 ` Ard Biesheuvel
2014-07-01 16:34 ` Nathan Lynch [this message]
2014-07-01 20:08 ` Ard Biesheuvel
2014-07-01 22:44 ` Russell King - ARM Linux
2014-06-30 14:40 ` Will Deacon
2014-06-30 15:42 ` Nathan Lynch
2014-06-30 21:56 ` Andy Lutomirski
2014-07-01 9:04 ` Will Deacon
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