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[60.241.69.122]) by smtp.gmail.com with ESMTPSA id h1sm12519100pfh.72.2021.05.31.23.23.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 May 2021 23:23:27 -0700 (PDT) From: Nicholas Piggin To: Andrew Morton Cc: Nicholas Piggin , Randy Dunlap , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, Anton Blanchard , Andy Lutomirski Subject: [PATCH v3 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Tue, 1 Jun 2021 16:23:03 +1000 Message-Id: <20210601062303.3932513-5-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210601062303.3932513-1-npiggin@gmail.com> References: <20210601062303.3932513-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On a 16-socket 192-core POWER8 system, a context switching benchmark with as many software threads as CPUs (so each switch will go in and out of idle), upstream can achieve a rate of about 1 million context switches per second. After this patch it goes up to 118 million. Signed-off-by: Nicholas Piggin --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 088dd2afcfe4..8a092eedc692 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -252,6 +252,7 @@ config PPC select IRQ_FORCED_THREADING select MMU_GATHER_PAGE_SIZE select MMU_GATHER_RCU_TABLE_FREE + select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 select MODULES_USE_ELF_RELA select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE select NEED_SG_DMA_LENGTH -- 2.23.0 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=-13.5 required=3.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED,DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 D4AF5C4708F for ; Tue, 1 Jun 2021 06:25:31 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (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 4E88961375 for ; Tue, 1 Jun 2021 06:25:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4E88961375 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FvMbZ2mQVz3c8J for ; Tue, 1 Jun 2021 16:25:30 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=TMuuo1b+; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gmail.com (client-ip=2607:f8b0:4864:20::62b; helo=mail-pl1-x62b.google.com; envelope-from=npiggin@gmail.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=TMuuo1b+; dkim-atps=neutral Received: from mail-pl1-x62b.google.com (mail-pl1-x62b.google.com [IPv6:2607:f8b0:4864:20::62b]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4FvMYG4Ccgz3014 for ; Tue, 1 Jun 2021 16:23:30 +1000 (AEST) Received: by mail-pl1-x62b.google.com with SMTP id 11so2817183plk.12 for ; Mon, 31 May 2021 23:23:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=PZkiKtXqsSUWsFPxoaMD52BWVXcB9txjh0r70N9gfwg=; b=TMuuo1b+x5/KjM8834zLhSTP9eYuo7t0tW46rm7j4SnXrgLEDWE0TOlUaFMqu8a+wI vbs8XSGlHrRcHcTNztnJ6FzCBPFzIdXlEHvPisjfSNJtPoi22YsCPwpfGpRVCfOzBEyA qIpgYtAQFvdrhvVyPuJFVlv69Dqy2++lkPLlvSfYFcFCmgn46h+CL735k7uWPO2iR6ib F/kGzqky6oCb6NGOI9e7WIPMpMGVye8FitjlLICcOtIpc9ld3zB5Wx8ELsL60gT36dHI 97jMnbIhzGPVji0u7wu9KoHMx8MMSH5LNriPf5FvHIo0aVVgBAQXAvYl2+p+Q7UssMwq afpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=PZkiKtXqsSUWsFPxoaMD52BWVXcB9txjh0r70N9gfwg=; b=DCqIDqqfmTLEYimHS8v4Jeiy66ABLSzgvZcmhaBmiho+FVpIPvu+O7+A0E1OP6lqLW 7u8bCtyk4mrvke5SWCgPoafgBCBvHxccRc22E/R+oV9GT+BEd4vGZ4F/8ZpkHiGGo59X N4KlCdPshwgXxfXvqG2wz/MhbCs5E7qq2yM721QKIoT1d/SlyQRJiXUtsoi4vfA/JUFS MbkoWEeXd4Qg2TcwfLf4J14sPz09bO1b2TAoKiksGyEBGU+j+uhHruc/JhJJ097OUCmx cI2UFpb4urTxUbXGVlY5uopXQzSwr1ZvXyLXWUWhgtFMbhA3qwSlHbvq6FXlTyQqJA9H BcPQ== X-Gm-Message-State: AOAM530f7X6qHpzZZmyXvdkts7/drDJdx0inGU8Dz3gsVgnc8zm9Z38z 7oii/7OXan5gxtoBDdGRRME= X-Google-Smtp-Source: ABdhPJzO7M0Hh974CEgDAeZuPzkos1it6HgA9FTrTsKtUq98J+3jqEoDd6tOI7VI/NdE9fIIB6URYw== X-Received: by 2002:a17:90b:1094:: with SMTP id gj20mr14135765pjb.45.1622528607822; Mon, 31 May 2021 23:23:27 -0700 (PDT) Received: from bobo.ibm.com (60-241-69-122.static.tpgi.com.au. [60.241.69.122]) by smtp.gmail.com with ESMTPSA id h1sm12519100pfh.72.2021.05.31.23.23.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 May 2021 23:23:27 -0700 (PDT) From: Nicholas Piggin To: Andrew Morton Subject: [PATCH v3 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Tue, 1 Jun 2021 16:23:03 +1000 Message-Id: <20210601062303.3932513-5-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210601062303.3932513-1-npiggin@gmail.com> References: <20210601062303.3932513-1-npiggin@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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: linux-arch@vger.kernel.org, Randy Dunlap , linux-kernel@vger.kernel.org, Nicholas Piggin , linux-mm@kvack.org, Andy Lutomirski , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On a 16-socket 192-core POWER8 system, a context switching benchmark with as many software threads as CPUs (so each switch will go in and out of idle), upstream can achieve a rate of about 1 million context switches per second. After this patch it goes up to 118 million. Signed-off-by: Nicholas Piggin --- arch/powerpc/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 088dd2afcfe4..8a092eedc692 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -252,6 +252,7 @@ config PPC select IRQ_FORCED_THREADING select MMU_GATHER_PAGE_SIZE select MMU_GATHER_RCU_TABLE_FREE + select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 select MODULES_USE_ELF_RELA select NEED_DMA_MAP_STATE if PPC64 || NOT_COHERENT_CACHE select NEED_SG_DMA_LENGTH -- 2.23.0