From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Christophe Leroy <christophe.leroy@c-s.fr>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
arnd@arndb.de
Subject: Re: [PATCH v4 1/8] powerpc/32: Add VDSO version of getcpu on non SMP
Date: Wed, 29 Jan 2020 16:17:26 +1100 (AEDT) [thread overview]
Message-ID: <486sDk52QMz9s1x@ozlabs.org> (raw)
In-Reply-To: <eaac4b6494ecff1811220fccc895bf282aab884a.1575273217.git.christophe.leroy@c-s.fr>
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@c-s.fr>
Patches 1, 2 and 4-8, applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/902137ba8e469ed07c7f120a390161937a6288fb
cheers
next prev parent reply other threads:[~2020-01-29 5:44 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 7:57 [PATCH v4 0/8] powerpc/vdso32 enhancement and optimisation Christophe Leroy
2019-12-02 7:57 ` [PATCH v4 1/8] powerpc/32: Add VDSO version of getcpu on non SMP Christophe Leroy
2020-01-29 5:17 ` Michael Ellerman [this message]
2019-12-02 7:57 ` [PATCH v4 2/8] powerpc/vdso32: Add support for CLOCK_{REALTIME/MONOTONIC}_COARSE Christophe Leroy
2019-12-02 7:57 ` [PATCH v4 3/8] powerpc: Fix vDSO clock_getres() Christophe Leroy
2019-12-04 13:30 ` Michael Ellerman
2019-12-02 7:57 ` [PATCH v4 4/8] powerpc/vdso32: inline __get_datapage() Christophe Leroy
2019-12-02 7:57 ` [PATCH v4 5/8] powerpc/vdso32: Don't read cache line size from the datapage on PPC32 Christophe Leroy
2019-12-02 7:57 ` [PATCH v4 6/8] powerpc/vdso32: use LOAD_REG_IMMEDIATE() Christophe Leroy
2019-12-02 7:57 ` [PATCH v4 7/8] powerpc/vdso32: implement clock_getres entirely Christophe Leroy
2020-05-05 22:52 ` Aurelien Jarno
2019-12-02 7:57 ` [PATCH v4 8/8] powerpc/vdso32: miscellaneous optimisations Christophe Leroy
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