From patchwork Mon Jan 13 17:08:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christophe Leroy X-Patchwork-Id: 11330647 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4167F921 for ; Mon, 13 Jan 2020 17:11:44 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 053D12075B for ; Mon, 13 Jan 2020 17:11:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="l1fhDd24"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=c-s.fr header.i=@c-s.fr header.b="UjWNw3Qp" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 053D12075B Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=c-s.fr Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Date:To:Subject: From:References:In-Reply-To:Message-Id:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=ac7jSOsVVrVMXhAGYoBNoFxccUuiyUR9kdM4CODdWY8=; b=l1fhDd24ibcooKd5RHNQ0OTbZH F6lzBMV8BmfRiS150gdzVs5KvB8ywofXPXuX8Q0PF6NfVhBH+iXvR17qtNR8Dxh+Bbxp0igsUd1ps jRNlIavjYjmAQJHAPT+TfiSO/eI8hsj5NFN9l5WOpFHoLiCc3XfNAHDGMhs/Ymbjq0LB5iNXoG+Nl WUB1krGP2Aafq4HO/+Aezjo6rNwq9lITSKn5Zu4MufWoXxHiSxkxCCe+pJQ6x1tG1wmhlADVOOT+8 +pOiyvpRzz0k7FIalEoa/+JFsJJ+9LSV6vf8tE1ACQASLxX6l0Pja4jHVwkw6h7P4Dmb973uWjy5A xkyY/WFw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1ir3Fc-0006Gs-8g; Mon, 13 Jan 2020 17:11:40 +0000 Received: from pegase1.c-s.fr ([93.17.236.30]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1ir3Ct-0002OT-GP for linux-arm-kernel@lists.infradead.org; Mon, 13 Jan 2020 17:08:54 +0000 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 47xKmq18QMz9v0DP; Mon, 13 Jan 2020 18:08:43 +0100 (CET) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=UjWNw3Qp; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id B9T6ObAEkSau; Mon, 13 Jan 2020 18:08:43 +0100 (CET) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 47xKmp6WlNz9tyXf; Mon, 13 Jan 2020 18:08:42 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1578935322; bh=8NMCNHuubcE6t4e17wk7DBu9YLriy2ZDehAsOAuF4AM=; h=In-Reply-To:References:From:Subject:To:Cc:Date:From; b=UjWNw3QpjSpsFOvUaUM8OtpncTUsaDVW9fyOtxPvIgOjuPt21K4VGlFLKAZvHGAtg DX/ABsxBaXP3v+YseN/kLMMmCMS6KlqlBycosWAZM50e9rJLMJtj+tUVoQ8kLmhZf0 0+1xi5QWHkWEUZO1UnR9hyZyBn2sJlPTBiymcRl4= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 3CA3A8B7C9; Mon, 13 Jan 2020 18:08:48 +0100 (CET) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id MOJBmvXIlLvR; Mon, 13 Jan 2020 18:08:48 +0100 (CET) Received: from po14934vm.idsi0.si.c-s.fr (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 05B648B7BE; Mon, 13 Jan 2020 18:08:48 +0100 (CET) Received: by localhost.localdomain (Postfix, from userid 0) id CF0AD64A1D; Mon, 13 Jan 2020 17:08:47 +0000 (UTC) Message-Id: In-Reply-To: References: From: Christophe Leroy Subject: [RFC PATCH v3 09/12] powerpc/vdso: provide inline alternative to __get_datapage() To: Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , arnd@arndb.de, tglx@linutronix.de, vincenzo.frascino@arm.com, luto@kernel.org Date: Mon, 13 Jan 2020 17:08:47 +0000 (UTC) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200113_090851_915614_2FF5BE18 X-CRM114-Status: UNSURE ( 9.06 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [93.17.236.30 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: x86@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org __get_datapage() is only a few instructions to retrieve the address of the page where the kernel stores data to the VDSO. By inlining this function into its users, a bl/blr pair and a mflr/mtlr pair is avoided, plus a few reg moves. The improvement is noticeable (about 55 nsec/call on an 8xx) With current __get_datapage() function: gettimeofday: vdso: 731 nsec/call clock-gettime-realtime-coarse: vdso: 668 nsec/call clock-gettime-monotonic-coarse: vdso: 745 nsec/call Using the __get_datapage macro provided by this patch: gettimeofday: vdso: 677 nsec/call clock-gettime-realtime-coarse: vdso: 613 nsec/call clock-gettime-monotonic-coarse: vdso: 690 nsec/call Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/vdso_datapage.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/powerpc/include/asm/vdso_datapage.h b/arch/powerpc/include/asm/vdso_datapage.h index 4d7965bf369e..7342cc0c1ae4 100644 --- a/arch/powerpc/include/asm/vdso_datapage.h +++ b/arch/powerpc/include/asm/vdso_datapage.h @@ -105,6 +105,17 @@ struct vdso_arch_data { extern struct vdso_arch_data *vdso_data; +#else /* __ASSEMBLY__ */ + +.macro get_datapage ptr, offset=0 + bcl 20, 31, .+4 + mflr \ptr +#if CONFIG_PPC_PAGE_SHIFT > 14 + addis \ptr, \ptr, (_vdso_datapage + \offset - (.-4))@ha +#endif + addi \ptr, \ptr, (_vdso_datapage + \offset - (.-4))@l +.endm + #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */