linux-kernel - Re: [PATCH v4 1/8] powerpc/32: Add VDSO version of getcpu on non SMP

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Message-Id: <486sDk52QMz9s1x@ozlabs.org>
Date:   Wed, 29 Jan 2020 16:17:26 +1100 (AEDT)
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        arnd@...db.de
Subject: Re: [PATCH v4 1/8] powerpc/32: Add VDSO version of getcpu on non SMP

On Mon, 2019-12-02 at 07:57:27 UTC, Christophe Leroy wrote:
> Commit 18ad51dd342a ("powerpc: Add VDSO version of getcpu") added
> getcpu() for PPC64 only, by making use of a user readable general
> purpose SPR.
> 
> PPC32 doesn't have any such SPR.
> 
> For non SMP, just return CPU id 0 from the VDSO directly.
> PPC32 doesn't support CONFIG_NUMA so NUMA node is always 0.
> 
> Before the patch, vdsotest reported:
> getcpu: syscall: 1572 nsec/call
> getcpu:    libc: 1787 nsec/call
> getcpu:    vdso: not tested
> 
> Now, vdsotest reports:
> getcpu: syscall: 1582 nsec/call
> getcpu:    libc: 502 nsec/call
> getcpu:    vdso: 187 nsec/call
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

Patches 1, 2 and 4-8, applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/902137ba8e469ed07c7f120a390161937a6288fb

cheers