[PATCH v7 0/9] ARM: VDSO
STALE4456d
From: Nathan Lynch <hidden>
Date: 2014-07-01 16:34:25
Revision v7 of 15 in this series.
Revisions (15)
- v7 [diff vs current]
- v7 [diff vs current]
- v7 [diff vs current]
- v7 [diff vs current]
- v7 [diff vs current]
- v7 current
- v8 [diff vs current]
- v9 [diff vs current]
- v9 [diff vs current]
- v9 [diff vs current]
- v9 [diff vs current]
- v10 [diff vs current]
- v11 [diff vs current]
- v11 [diff vs current]
- v11 [diff vs current]
On 06/30/2014 03:12 AM, Ard Biesheuvel wrote:
On 23 June 2014 05:11, Nathan Lynch [off-list ref] wrote:quoted
Provide fast userspace implementations of gettimeofday and clock_gettime on systems that implement the generic timers extension defined in ARMv7.
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Tested-by: Ard Biesheuvel <redacted> 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.