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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 23D28CD98CE for ; Tue, 16 Jun 2026 05:00:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=c1S0w+P/QW9r6MLKhBpljIxNYB1FXvjAapFvsTRpai4=; b=QOnX85dBGUQ05ogLFua6cJailT sSuxVfPVGeSZG07wUbs2fTMWRe/7xP1n9OmYe1bk7ahqdBrrHveU6cyQN/Bdr21L4D+KVQghl3eAx ZFNxPBl0V5L9lSaBpEnhxgpRNmJIEBAY2+pMHn0kebWvhX7uNNmu9ywoxzsOIqWmeBPTXcXqT4qEP xl0dwS1adeD8iOR3oNm3Vq2h4ANJpA7+aPud5OqFNys9Cbd1hiT96nOeba5v6PJgqDu8k6M4+sJ/d k3g0XF1Jz5cpCuiXLEYM0A49hq9iGDp1NOwUylVZl2gCpa6r7sIFZoPm3dznMhsNbUwHx2t7Gl+pC 8hcYi/gg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZLuJ-0000000FDw8-0bR8; Tue, 16 Jun 2026 05:00:15 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wZLuG-0000000FDvg-3E3O for linux-arm-kernel@lists.infradead.org; Tue, 16 Jun 2026 05:00:13 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 8EADA3D4B; Mon, 15 Jun 2026 22:00:06 -0700 (PDT) Received: from localhost (a079125.arm.com [10.164.21.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 833AF3F915; Mon, 15 Jun 2026 22:00:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1781586011; bh=pKqht8xBTdJPB8coISoY8X6SJ1c7ZZAUQnZN+qy2n2I=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=p/tq9cRXU7CTPJIcLoxIeuxSFMhB2z8/9qBRupZLiPMX8aupEXzRIuKsaVG/0p6j3 x8VUhBLZ0ZmzVaZEPfTOs/czMpJAlLQQKhjmuCP2nq9cZdGAqS1kfog+nv9PhY494T PxtJGZctd9VTRa78lBcu/41Y5qW6Ti0ctIr/FShg= Date: Tue, 16 Jun 2026 10:30:07 +0530 From: Linu Cherian To: Will Deacon Cc: Ryan Roberts , Catalin Marinas , Kevin Brodsky , Anshuman Khandual , Yang Shi , Mark Rutland , Huang Ying , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, shameerali.kolothum.thodi@huawei.com Subject: Re: [PATCH v2] arm64: tlbflush: Don't broadcast if mm was only active on local cpu Message-ID: References: <20260523134710.3827956-1-linu.cherian@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260615_220012_872186_1FAED6D8 X-CRM114-Status: GOOD ( 16.77 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On Mon, Jun 15, 2026 at 03:43:41PM +0100, Will Deacon wrote: > On Mon, Jun 15, 2026 at 12:21:19PM +0100, Ryan Roberts wrote: > > On 14/06/2026 12:04, Will Deacon wrote: > > > On Sat, May 23, 2026 at 07:17:10PM +0530, Linu Cherian wrote: > > >> From: Ryan Roberts > > >> > > >> Testing with 7.1-rc4 : > > >> +-----------------------+---------------------------------------------------+-------------+ > > >> | Benchmark | Result Class | Improvement| > > >> +=======================+===================================================+=============+ > > >> | perf/syscall | fork (ops/sec) | (I) 3.25% | > > >> +-----------------------+---------------------------------------------------+-------------+ > > >> | pts/memtier-benchmark | Protocol: Redis Clients: 100 Ratio: 1:5 (Ops/sec) | (I) 2.70% | > > >> | | Protocol: Redis Clients: 100 Ratio: 5:1 (Ops/sec) | (I) 2.13% | > > >> +-----------------------+---------------------------------------------------+-------------+ > > > > > > I think we need a much more comprehensive set of benchmarks before we can > > > begin to consider a change like this. > > > > I believe that Linu ran a wider set of benchmarks and didn't find any > > regressions. These are just the ones that show improvement (Linu, please correct > > me and/or provide details). > > I think it's important to show the ones that suffer as well... and also > look at different configurations (e.g. preemptible settings) and different > environments (e.g. native vs in a VM). All our tests were ran on the host. Yeah, agree that other suggested configurations/environments need to be anlayzed as well. -- Thanks, Linu Cherian.