From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 40D93C33CB2 for ; Wed, 29 Jan 2020 05:44:54 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F0CEC2071E for ; Wed, 29 Jan 2020 05:44:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org F0CEC2071E Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 486srM48KMzDqMp for ; Wed, 29 Jan 2020 16:44:51 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [203.11.71.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 486sDl4j4LzDqMn for ; Wed, 29 Jan 2020 16:17:27 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=ellerman.id.au Received: by ozlabs.org (Postfix, from userid 1034) id 486sDk52QMz9s1x; Wed, 29 Jan 2020 16:17:26 +1100 (AEDT) X-powerpc-patch-notification: thanks X-powerpc-patch-commit: 902137ba8e469ed07c7f120a390161937a6288fb In-Reply-To: To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras From: Michael Ellerman Subject: Re: [PATCH v4 1/8] powerpc/32: Add VDSO version of getcpu on non SMP Message-Id: <486sDk52QMz9s1x@ozlabs.org> Date: Wed, 29 Jan 2020 16:17:26 +1100 (AEDT) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, arnd@arndb.de Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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 Patches 1, 2 and 4-8, applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/902137ba8e469ed07c7f120a390161937a6288fb cheers