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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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=ham 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 277CFC47092 for ; Tue, 1 Jun 2021 06:23:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0AE506139A for ; Tue, 1 Jun 2021 06:23:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233030AbhFAGZS (ORCPT ); Tue, 1 Jun 2021 02:25:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233056AbhFAGZJ (ORCPT ); Tue, 1 Jun 2021 02:25:09 -0400 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3267BC061574; Mon, 31 May 2021 23:23:28 -0700 (PDT) Received: by mail-pj1-x1031.google.com with SMTP id g24so7759729pji.4; Mon, 31 May 2021 23:23:28 -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=ob53DnyrCmqwppvvmYaPjt0yvUtLWkN4oxxsde74nszKBsUmNv9y0yBvl9Uz1dmJMe 5UpedMwXJvOaHAxuxrlYpvbSJV848jDLpC5me7gl7HK1PRVDp7nRlmMjdzHz2qKnHSfu 2QWn2Xa4MTjfKpkCiNL32QHR47MB7s5t6/kulvy239lzNYZpCIpo9vDZqYuXRoV3q86F gFYbQWHWTewYVr5jmMGUHA3W5nBm5dguM23flE6ssS6/sWfEB/2LVJAYO+N2HAcrBvQh deyXL6ukBc4lcee4SA/sHsX0bQ0MJJPT3U8Si2zJ+biO41xVCX6I8GmH+bm1c007uxXH jVOg== X-Gm-Message-State: AOAM530kpmdwdL032FOleAPPtmUnbVmi67RFsZoxVRntvDjbQggziBNL NdFF2nXE9WdPZQC3HI0zAJU= 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 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-arch@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