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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 28396E9A02C for ; Wed, 18 Feb 2026 22:08:16 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F3FD16B0088; Wed, 18 Feb 2026 17:08:14 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id EEDB46B0089; Wed, 18 Feb 2026 17:08:14 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DF9F56B008A; Wed, 18 Feb 2026 17:08:14 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id CB56E6B0088 for ; Wed, 18 Feb 2026 17:08:14 -0500 (EST) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 67B8F1A0336 for ; Wed, 18 Feb 2026 22:08:14 +0000 (UTC) X-FDA: 84458966508.27.B92BA5E Received: from out-180.mta1.migadu.com (out-180.mta1.migadu.com [95.215.58.180]) by imf13.hostedemail.com (Postfix) with ESMTP id 0BD7520005 for ; Wed, 18 Feb 2026 22:08:10 +0000 (UTC) Authentication-Results: imf13.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=TDCGGAmU; spf=pass (imf13.hostedemail.com: domain of shakeel.butt@linux.dev designates 95.215.58.180 as permitted sender) smtp.mailfrom=shakeel.butt@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771452492; a=rsa-sha256; cv=none; b=T+D7agggV3ZD+n84hDQabc1rAPmCQNAOhCwoNv4fAI5Rz4A/qragneyrMkRWKRUY+Y7y/E H9W+cF6rgj2gg1eX4Ge6KCsFlrFac6Nlf1G033zdrVmADR3k9ccZ+Qcjz/pYzhOQGW/Bzi 9XvBT3nnjhpzx3hg7EQ9uDkqoU5ld50= ARC-Authentication-Results: i=1; imf13.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=TDCGGAmU; spf=pass (imf13.hostedemail.com: domain of shakeel.butt@linux.dev designates 95.215.58.180 as permitted sender) smtp.mailfrom=shakeel.butt@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771452492; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=PkQZRG8kkv/0JZ4QGiciA4Q1sGZEe0QvxA9mlMq1dYQ=; b=hxXWgJxthuV1F/RC5q+4gowjVLi1iayKDSu1uRvFYX2LH0+S5FFugoJVaRCE2XKwa0geP2 T3PYqQnBZKqP/ZelQ0B4iDtuMvpUmRJ+XejON5ynpLYExBhqbE+pIBuFbm2ASyvodnsEyc szPeoZDmu9SEPwAC3zaegANEdLMGg+E= Date: Wed, 18 Feb 2026 14:07:57 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1771452485; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=PkQZRG8kkv/0JZ4QGiciA4Q1sGZEe0QvxA9mlMq1dYQ=; b=TDCGGAmUvkAuX/mo0nag675svbXFq3hMs4EG1iduTdhKTQitfUntudSYxKpkvpLYMdrxE4 I3BOIw7EFJqvAV16juvmCflQXUz5SOO8BYCfSSLKDwgQ6u+0dwRbWEsd5DXWxFxsfoDJiK UovwLqkE9q/FmQSixb8/OVlkrgEtedI= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Shakeel Butt To: Jisheng Zhang Cc: Catalin Marinas , Will Deacon , Dennis Zhou , Tejun Heo , Christoph Lameter , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH] arm64: remove HAVE_CMPXCHG_LOCAL Message-ID: References: <20260215033944.16374-1-jszhang@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260215033944.16374-1-jszhang@kernel.org> X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 0BD7520005 X-Stat-Signature: jsacfezq4y1iwxa3usdt1b1bj18cids7 X-Rspam-User: X-Rspamd-Server: rspam04 X-HE-Tag: 1771452490-735495 X-HE-Meta: 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 nkZOENvI EL9+Hx+I3Yzx8zkCoXY3Ad1H1kk6BppDCwWDUZofK5yAJtS4j0+TV3y59x8YACKflRnhmDJ7AC4Fi/WUIWx1X+lcIBlnfNB7AADzDB8b4rVflenYDsjn9a5U1TVNCMCW3W8vuhMNEak+WD0G8Cptuwc0Ec2e43ULurNYTueprZPIWSR7Sjc/zeDJXyxH1lIa8kMuo/wrJC2PgCs9D4HvBvl3zQq8bUvu16a3qMvKHNlA1sDCBksnzyMjrz203b+uVQYdgHXSTMcBfVDBRN85n28JXBQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Feb 15, 2026 at 11:39:44AM +0800, Jisheng Zhang wrote: > It turns out the generic disable/enable irq this_cpu_cmpxchg > implementation is faster than LL/SC or lse implementation. Remove > HAVE_CMPXCHG_LOCAL for better performance on arm64. > > Tested on Quad 1.9GHZ CA55 platform: > average mod_node_page_state() cost decreases from 167ns to 103ns > the spawn (30 duration) benchmark in unixbench is improved > from 147494 lps to 150561 lps, improved by 2.1% > > Tested on Quad 2.1GHZ CA73 platform: > average mod_node_page_state() cost decreases from 113ns to 85ns > the spawn (30 duration) benchmark in unixbench is improved > from 209844 lps to 212581 lps, improved by 1.3% > > Signed-off-by: Jisheng Zhang Please note that mod_node_page_state() can be called in NMI context and generic disable/enable irq are not safe against NMIs (newer arm arch supports NMI).