Re: [PATCH] [RFC] powerpc: Add VDSO version of time
From: Adhemerval Zanella <hidden>
Date: 2013-04-05 18:51:05
On 04/05/2013 03:21 AM, Michael Ellerman wrote:
On Tue, Mar 19, 2013 at 04:55:31PM -0300, Adhemerval Zanella wrote:quoted
Hi all, This patch implement the time syscall as vDSO. I have a glibc patch to use it as IFUNC (as latest gettimeofday patch). Below the perf numbers: Baseline PPC32: 380 nsec Baseline PPC64: 352 nsec vdso PPC32: 20 nsec vdso PPC64: 20 nsec I focused on 64 bit kernel, do I need to provide a scheme for 32 bits as well?You did provide a 32-bit implementation. I take it you haven't tested that though? Can you test it?
I haven't test it yet and I believe it won't be troublesome to do so.
What happens if I don't have the glibc patch?
GLIBC current behavior is to use the syscall.
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