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 E1900C98302 for ; Wed, 23 Sep 2026 07:20:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E503E6B008A; Wed, 23 Sep 2026 03:20:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E27826B0099; Wed, 23 Sep 2026 03:20:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D3EA96B009D; Wed, 23 Sep 2026 03:20:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id B42FF6B008A for ; Wed, 23 Sep 2026 03:20:01 -0400 (EDT) Received: from smtpin27.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 3C1991203E4 for ; Wed, 23 Sep 2026 07:20:01 +0000 (UTC) X-FDA: 85244177802.27.2F9CC07 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf02.hostedemail.com (Postfix) with ESMTP id 9C1C98000A for ; Wed, 23 Sep 2026 07:19:59 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Pjp16mZs; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf02.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790147999; 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=gziUiBPvy7xlnA9Psh/XnuMh7PkIHbeXiu+KpjWd6go=; b=j21GR1CHG4SHegkypxqHx7ZjFm64oAIr8rY+LIKARYUQpdWw45MXdSDbaNZL0GhtKkFUOH YM7NDfFBzzds62/QTj7LTGLsrMLiuoo20RekexEQ0K87I0IunxQ4bqjkSoo6DqtiG/93nc 3Ii0anAqPejTQ9mmP5VqI2FYHBLq8pU= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Pjp16mZs; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf02.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@kernel.org ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790147999; b=TI564GeV+uKmHo9acX3bPHg/2lHz9uxN5GZrnHeBch+24MGerluiMZskwvsgrjwpb3Y6DX pv/gNpMoY7nh3CE6GwcauYE/ooQGrfiKppWOC1KCe6srXwplLDY4l93R3wCjRmRKXs/3WN kbU0KFijtxrnvGqb91IWlr0sJW7+hL4= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id D64E241B6D; Wed, 23 Sep 2026 07:19:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 24F2F1F000FF; Wed, 23 Sep 2026 07:19:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1790147998; bh=gziUiBPvy7xlnA9Psh/XnuMh7PkIHbeXiu+KpjWd6go=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Pjp16mZsVP5+uIktXkAWb55DfP3vzDdpoxGQASzoYolcqBMemw9oonzL8IBUYGRnk ekxdXaZVkK34HQAlc6hY2aqFH+PmdtWeo1hBB0QnDq5yilA8uUqhKxaOGoq/PJZQQp cnyVDJpmic/PRv6PaC7FkDs2PnWGVeT6AM7PvYm7BfCxZ9athTVXREu2RIp7CB8pU0 n8Z0c7LBPlb2eJmswE3Jm+jlRG71Ls2cTJwtJKVQvdzgNKpsGxmsntfxjD85mfm557 vfXzAJODkO0Qp3BJdTUAVR8W4knmv4REgN/mFN0+0h88Atr4I8A+aoFICQpSo4pRBo pXCeKZw1kkSCg== Date: Wed, 23 Sep 2026 08:19:51 +0100 From: "Lorenzo Stoakes (ARM)" To: "Vlastimil Babka (SUSE)" Cc: kernel test robot , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Andrew Morton , Daehyeon Ko <4ncienth@gmail.com>, Mike Rapoport , David Hildenbrand , Alexei Starovoitov , "David S. Miller" , Hagen Paul Pfeifer , Jakub Kacinski , James Bottomley , Jesper Dangaard Brouer , John Fastabend , "Liam R. Howlett" , Michal Hocko , Stanislav Fomichev , Suren Baghdasaryan , linux-mm@kvack.org Subject: Re: [linus:master] [mm/secretmem] 97d34aa65c: stress-ng.secretmem.ops_per_sec 99.5% regression Message-ID: References: <202609230824.7a9189aa-lkp@intel.com> <7ea6e90a-e2fb-4793-b6ea-e292388bdfdf@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7ea6e90a-e2fb-4793-b6ea-e292388bdfdf@kernel.org> X-Stat-Signature: j37g4dcifqzgf4obm5emyq8s3m6drsnz X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 9C1C98000A X-HE-Tag: 1790147999-882922 X-HE-Meta: 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 BxbxFOar mSO7yXPJgxqTBDm7HAkh6+NQ1KyXZzw984AGST2yH6aiMWrgIvjKRueEhcSaUzL6/zN2PFsB9XXXBWFiE6D2/HLPfhyDH8/dfUiKrtci3kXROefo1o43+PA4977f4kJ9FJbab1CnMBsULFgk70FDF72B7oMMTAjmOI0fPP+HrQlh7kxgfZCVjSX79PWnS80pagUE/IFZn2U+z6+hGmnVcoiQJCLLVukbbreVYX7Olq1mmPwiForBhUFMZntNco3do3AE+l8lCCYG5hftwJ5nFmMtgDfAFNnwYcEiUriYk7W8g8HW6+ceJ0w80996AaL3B1AsLHpiDftEx4jVLMkhjhlgjIRCS0GYpNYTe+6BwW2cTr184JksUF5JWlrC0AVVanF50KsqLJl44iOVu77oRozgbmmZZPbwzTlf76sLaVKNBpnFvF5hP20v1uo/wcUvRy0hg Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Sep 23, 2026 at 08:35:47AM +0200, Vlastimil Babka (SUSE) wrote: > On 9/23/26 03:00, kernel test robot wrote: > > > > > > Hello, > > > > kernel test robot noticed a 99.5% regression of stress-ng.secretmem.ops_per_sec on: > > > > commit: 97d34aa65c29cca85e3e9050f4c936389b38a054 ("mm/secretmem: properly account locked pages") https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master > > Well maybe there is some inefficiency that can be fixed (haven't checked) > but if it's the cost for proper accounting then so be it? I doubt creating > secretmem pages is something userspace would have to do intensively enough > to matter. Yeah, exactly. This isn't something that should be benchmarked, this is possibly the most ludicrious benchmark I've ever seen :) If establishing a secretmem region is on your hot path you have engineered your software wrong. This is effectively a security flaw so I'm afraid must remain. -- Cheers, Lorenzo