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=-15.7 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=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 EAC67C64E90 for ; Sat, 28 Nov 2020 22:01:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91335223FB for ; Sat, 28 Nov 2020 22:01:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="O2SH7PLZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390552AbgK1VvK (ORCPT ); Sat, 28 Nov 2020 16:51:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39250 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729945AbgK1Sc6 (ORCPT ); Sat, 28 Nov 2020 13:32:58 -0500 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7DC6AC0258FE; Sat, 28 Nov 2020 08:02:28 -0800 (PST) Received: by mail-pl1-x633.google.com with SMTP id t18so4136657plo.0; Sat, 28 Nov 2020 08:02:28 -0800 (PST) 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=8ryYzZTfuMdMQoDGnZ6qQm92nrELT0Bznsq8pS5zNkE=; b=O2SH7PLZYn9x9yrSkPvaAZdWZ4Hk1Nz9o1vpICXBIyIIgIdy8d9QFKV+1r92+5zuOs gYKTram4WPDCSdl+hhVkmF9+vrkTQECccC9p+zkSVnyHnydt6RZsEWjgzXbamDwz8Ryf WwRcOCDkLf2yHoNmiO4MHVOErhGamyhGZEu/rYwWW8NOV9V/N1bEFCnSnAJQkVeT5lqs dhR5ybbQNLsLTLCFZze+EY6rm27mttggd2bAwJ7eXS3YKnz/bnqJ0GT0EmjvtORGnwS+ 17SXi5CsTI/P47c8OyIr30m3TcLjy6wRktbukjqqdEaVGzvGIE/erk1qflt4sxiTfF0m Fmsg== 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=8ryYzZTfuMdMQoDGnZ6qQm92nrELT0Bznsq8pS5zNkE=; b=eK3ziEiE/BotdTZW6j9wspQR52WnithtcjadyQQbvez7+1nH9mIw713INsCA7atain WnZ7/xIS4VZzgXyzV1pYxSaKqL0Pssl1nqpimSjtQELdominV9kPVi1/eHMiiipqUZZL jQZuV7MiVqi+9lSv8j+q2XTAZ7UjtH/sNKruXFkJfI7xbBJbfDM9oHa0JFgyIVZpK9Gr Jk/8ygVfsO0964Ih11yWpcg1wYp/028w4zHA5stZyVLwVWuk3X6ZEQHDNXYgF8+BJ7YB XCXI10L8x7UjqqfQtnXQxf9Q964IL+LodZNVw/OWBmxqtWic85AIRyxPUsyIKONaJHeS nowA== X-Gm-Message-State: AOAM531fO9qEJrbSwNy66FU3VtJELN11WMKjloj4ZrMoIrRdfgzXEN1Z CdCjJeKO2AtrYmjY7OsluNOUUMYn+wU= X-Google-Smtp-Source: ABdhPJxOmOSo7yBdZGFr5Ee5U/YJuP5XMrKl+Nl3YUOkuajp7hYak8NpHsUyWSygIXkb6jTi/aUZeA== X-Received: by 2002:a17:902:ee53:b029:da:4c68:2795 with SMTP id 19-20020a170902ee53b02900da4c682795mr8244122plo.7.1606579347904; Sat, 28 Nov 2020 08:02:27 -0800 (PST) Received: from bobo.ibm.com (193-116-103-132.tpgi.com.au. [193.116.103.132]) by smtp.gmail.com with ESMTPSA id d4sm9762607pjz.28.2020.11.28.08.02.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 28 Nov 2020 08:02:27 -0800 (PST) From: Nicholas Piggin To: linux-kernel@vger.kernel.org Cc: Nicholas Piggin , x86@kernel.org, Mathieu Desnoyers , Arnd Bergmann , Peter Zijlstra , linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, Anton Blanchard Subject: [PATCH 8/8] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Sun, 29 Nov 2020 02:01:41 +1000 Message-Id: <20201128160141.1003903-9-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20201128160141.1003903-1-npiggin@gmail.com> References: <20201128160141.1003903-1-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 e9f13fe08492..d4793c0229d2 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -231,6 +231,7 @@ config PPC select HAVE_PERF_USER_STACK_DUMP select MMU_GATHER_RCU_TABLE_FREE select MMU_GATHER_PAGE_SIZE + select MMU_LAZY_TLB_SHOOTDOWN if PPC_BOOK3S_64 select HAVE_REGS_AND_STACK_ACCESS_API select HAVE_RELIABLE_STACKTRACE if PPC_BOOK3S_64 && CPU_LITTLE_ENDIAN select HAVE_SYSCALL_TRACEPOINTS -- 2.23.0