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]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD9DEC4321E for ; Wed, 30 Nov 2022 09:42:17 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 2BADE6B0072; Wed, 30 Nov 2022 04:42:17 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 26A2D6B0073; Wed, 30 Nov 2022 04:42:17 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 158AB6B0078; Wed, 30 Nov 2022 04:42:17 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 06CF26B0072 for ; Wed, 30 Nov 2022 04:42:17 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id CA02DC0CD5 for ; Wed, 30 Nov 2022 09:42:16 +0000 (UTC) X-FDA: 80189617872.23.329355F Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf23.hostedemail.com (Postfix) with ESMTP id 618D8140011 for ; Wed, 30 Nov 2022 09:42:15 +0000 (UTC) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 76CF861A43; Wed, 30 Nov 2022 09:42:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D2CF2C433C1; Wed, 30 Nov 2022 09:42:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669801333; bh=+hFunFOckwGRMYLvfCOQLQTdvGbAc7QBclk3Vh6O+Ro=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=uFDP+URli+rlZfs0AsL9hl1RblewQawNLqNKaIgBBNKiOIEZiIcOB4s6SwuggEwA9 AAg8IBh7xeLw97kpxXzK54o4ob5oncsytUhsG3wEAYbWZYKNPS/tr2PFGtQ1g/QHNs LBMfF2EsQxXM9x9WMP/TCIz7u2tp7BqAt14miqBXZtU3MHlO/Ziswo5F0SxMNCh7l/ xCOjKQw65lW6l7xhzofYxzEUz/Ay3eRIkef7AyknVuIYgkqrLGbp4cDH+OGvslRf43 SwYvyfrgBWHz3fMB0HWggKNTk5vvEeFDz9fPRpAQ/Pm8NHPMdwxHAH1gKBlGrFvxrG SZM7CcUnvITIg== Date: Wed, 30 Nov 2022 11:41:56 +0200 From: Mike Rapoport To: Song Liu Cc: Luis Chamberlain , bpf@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, x86@kernel.org, peterz@infradead.org, hch@lst.de, rick.p.edgecombe@intel.com, willy@infradead.org, dave@stgolabs.net, a.manzanares@samsung.com Subject: Re: [PATCH bpf-next v4 0/6] execmem_alloc for BPF programs Message-ID: References: <20221117202322.944661-1-song@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669801335; a=rsa-sha256; cv=none; b=Zmys1Ts7cQZjKjv/aJY5Kuz0MdqLrnS8k5zBPTxu86Ump4yK3MeNsditYSthKzqKKfzVIE 6DEufKsdAxK1UhMStflq9ulS6j+LIcjkkTqLOz/dPK4kB6CIzJDA7cd8+IC869bJ+gbjHi GoHbz81x/J+SG7IP2LtoK1gMPM4HVWQ= ARC-Authentication-Results: i=1; imf23.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uFDP+URl; spf=pass (imf23.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669801335; 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=8qLx+zj5dDjiaTpXxstxe0keRYCEbiFewx7Kw85ptDE=; b=Tg0ddAdlRclaShWzhruvm+ZfsfDiAtqUU2Hb4obArGzZ+YgTzz9wIYw6csb5wZ7tA0JIR7 zA9dt327QesMBnS7m/phAzXxN8W8/dmZihBCTzYnAIyV7tQbwyk9Zfm3yHtFDojFTCkfbe CHJbuljyCCUHdyhiGHBzXMx/pCXZa14= X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 618D8140011 X-Rspam-User: Authentication-Results: imf23.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uFDP+URl; spf=pass (imf23.hostedemail.com: domain of rppt@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=rppt@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Stat-Signature: qcwet1sejwx8kzhmgrq7a6dsinnyasbi X-HE-Tag: 1669801335-130330 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: On Mon, Nov 21, 2022 at 07:28:36PM -0700, Song Liu wrote: > On Mon, Nov 21, 2022 at 1:12 PM Luis Chamberlain wrote: > > > > Also, you mention your perf stats are run on a VM, I am curious what > > things you need to get TLB to be properly measured on the VM and if > > this is really reliable data Vs bare metal. I haven't yet been sucessful > > on getting perf stat for TBL to work on a VM and based on what I've read > > have been catious about the results. > > To make these perf counters work on VM, we need a newer host kernel > (my system is running 5.6 based kernel, but I am not sure what is the > minimum required version). Then we need to run qemu with option > "-cpu host" (both host and guest are x86_64). > > > > > So curious if you'd see something different on bare metal. > > Once the above all worked out, VM runs the same as bare metal from > perf counter's point of view. TLBs behave differently because of EPT. -- Sincerely yours, Mike.