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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 871BBC433EF for ; Tue, 9 Nov 2021 04:11:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 702846128E for ; Tue, 9 Nov 2021 04:11:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239926AbhKIEOi (ORCPT ); Mon, 8 Nov 2021 23:14:38 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58328 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239831AbhKIEO3 (ORCPT ); Mon, 8 Nov 2021 23:14:29 -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 AF639C061205; Mon, 8 Nov 2021 20:11:41 -0800 (PST) Received: by mail-pl1-x633.google.com with SMTP id v20so18554933plo.7; Mon, 08 Nov 2021 20:11:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=aQc0DqPPO6kMsrpf1a2eMeG1Oqju7se8HtSuYmathZ0=; b=U7/JfyAqiO2MKMCYeQeqbbijFBcQVa5T0EkptTY/YLTW8QWwlexKfEOnJ2omEegvxB uF1/wE3YW1h247SpMruInOTDxwNMEHNxRUM8ZwHj2wTdxRKoG/gi5vhVbwzr4AR5BUIA TYAJHzhWN5PU5gktO9OyGWzMn74UepthW2QsG30UPTkL3g+BF53XW2m/LIEqD2I96WAW xgbt/dMqW6IQ8BU/BqiZ4glQm3cFt7qyiLtWRvORZ3DXfSaifWFIfeBi23oSWLSqgIHe e6abn8XTCHj+m4MpBFH2mmclMDomCC25gGe8Vrd/npO31J7O4U9IUPbRVWrbsuGbRQU0 t+8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=aQc0DqPPO6kMsrpf1a2eMeG1Oqju7se8HtSuYmathZ0=; b=nFiF2g5C6lw/sSAl2GTKILWzdK9KSdRxY635pDfAcSGeUfwkLMRDfBqydvQC2oE1XV g15vSWfrN0NfRpsztsUUAdIZ6uHN77AglLIaF/yE1sN+yG03xLQGh/gP6OsWib0mWF/H LnxLorBU+XVsFq5GOyXAqRqXqFVSWi5mgCVNtGh6c4d77MdDa0qp3F0K/TiAeLbk2kDM UjGJ6UcdimVqP3p7MCcGddUEp00XnOm+E53kCs8qsa/+P7aKRqbXNfFLBjHFyVBo5QlH mxD7uE66WuPEZAOtf/xXIDujlqZA74y4GtFkiW/YRZOi2xNUxacAZF2We5nvlBFoFj8L 5QZA== X-Gm-Message-State: AOAM533He2zwJV90kPJkNYULeVOYdzS5yWBtRpWCs7aUwZ7EcBV1vG3X t8N62r1zEg0R7HrUowqAt9twPkNZCzI= X-Google-Smtp-Source: ABdhPJw5RAMBfn9DIjw2V4w3ZE2Oc2Ma5DmxWxSIog1/aLYNvg78RdgoN/I55DMnJioBaGhBoQdvSg== X-Received: by 2002:a17:90a:b382:: with SMTP id e2mr3827572pjr.119.1636431101310; Mon, 08 Nov 2021 20:11:41 -0800 (PST) Received: from bobo.ozlabs.ibm.com (60-241-46-56.tpgi.com.au. [60.241.46.56]) by smtp.gmail.com with ESMTPSA id o19sm18278063pfu.56.2021.11.08.20.11.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Nov 2021 20:11:41 -0800 (PST) From: Nicholas Piggin To: Andrew Morton Cc: Nicholas Piggin , Randy Dunlap , Andy Lutomirski , linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v5 4/4] powerpc/64s: enable MMU_LAZY_TLB_SHOOTDOWN Date: Tue, 9 Nov 2021 14:11:19 +1000 Message-Id: <20211109041119.1972927-5-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20211109041119.1972927-1-npiggin@gmail.com> References: <20211109041119.1972927-1-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, due to contention on the mm refcount. powerpc/64s meets the prerequisites for CONFIG_MMU_LAZY_TLB_SHOOTDOWN, so enable the option. This increases the above benchmark 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 ba5b66189358..8a584414ef67 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -249,6 +249,7 @@ 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