From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gentwo.org (gentwo.org [62.72.0.81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D5DD82F3C10 for ; Tue, 4 Aug 2026 22:07:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=62.72.0.81 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785881255; cv=none; b=C+OmWCx8DfagMtTLTZC6pgz574QVqa8RgXo7x6C6e9irvDurWFiX4Tff9vIYbgzn2/J3TYXQahoQwf7ILs66Qn8gVsb7anhxFLcJGY+dQxFegSVvb9pc3VoDdeuTPEp1KdWiBwoblG8f1snLPgYnEIVgCJAM/i9tEnnCDkYSEoA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785881255; c=relaxed/simple; bh=QRxCeGb+Adq7LiD+7lUvdxxJiJP+D9Kgl6PhZ4uJptg=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=lDTE/5TevaIyYdSzbUMyp8L79oyp2NzYewKypLsVer/nJU46yDzurZXiKzporjXwV9jZYrWBBrYE6U57l2TxYNUaOmA537PcxB6CTFSLQWGXZYhCFT7f9KWNnXzknx/shKN0CZLgVwraDd653LkYVtd+BL1DcgNSDw5kMx98s4I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gentwo.org; spf=pass smtp.mailfrom=gentwo.org; dkim=pass (1024-bit key) header.d=gentwo.org header.i=@gentwo.org header.b=DAe+N2tm; arc=none smtp.client-ip=62.72.0.81 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=gentwo.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gentwo.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=gentwo.org header.i=@gentwo.org header.b="DAe+N2tm" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gentwo.org; s=default; t=1785880617; bh=QRxCeGb+Adq7LiD+7lUvdxxJiJP+D9Kgl6PhZ4uJptg=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=DAe+N2tmEXUl4l/i68CbM/BPesGL9wZ1sVf/tby8SgjxJsjizi9dHc5L7byqB2opF pTWvumsCikE9vevIMNTQZRbJcbKISuBgK3tLyCfw1UW64tZOOMALZAFC+WDaMNZlce WBXT52dg/Eov66DwE5mtH/6nta6O70Du5tdlJ40c= Received: by gentwo.org (Postfix, from userid 1003) id CD19540FCF; Tue, 04 Aug 2026 14:56:57 -0700 (PDT) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id CBBC040287; Tue, 04 Aug 2026 14:56:57 -0700 (PDT) Date: Tue, 4 Aug 2026 14:56:57 -0700 (PDT) From: "Christoph Lameter (Ampere)" To: "David Hildenbrand (Arm)" cc: "Lorenzo Stoakes (ARM)" , Linus Torvalds , Mark Rutland , Yang Shi , Ryan Roberts , dennis@kernel.org, tj@kernel.org, urezki@gmail.com, catalin.marinas@arm.com, will@kernel.org, akpm@linux-foundation.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jason Gunthorpe Subject: Re: [RFC v2 PATCH 0/16] Optimize this_cpu_*() ops for non-x86 (ARM64 for this series) In-Reply-To: <4baf6edb-c84b-4da9-b905-4d40d4bf5fdc@kernel.org> Message-ID: <7f2b2030-b912-70ee-5019-02dad2e87ca6@gentwo.org> References: <0344c559-1959-4531-9265-d5a5180eb7cd@arm.com> <25d1e09b-53e4-7cd5-87db-b58437e4e690@gentwo.org> <4887267b-dc26-4c33-96ca-8dff054a0d1f@kernel.org> <8d6119c7-2216-fcdd-d0b9-cc60ccc8caf3@gentwo.org> <4baf6edb-c84b-4da9-b905-4d40d4bf5fdc@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII On Tue, 4 Aug 2026, David Hildenbrand (Arm) wrote: > > These are operations that are key to the performance in critical parts of > > memory management and this code is replicated by being inlined thousands > > of times in the kernel. > > Cool, then it is easy to show the difference by running micro + macro benchmarks. And we have done so repeatedly. Look at Yang's posts.