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 BF7BEC77B61 for ; Tue, 11 Apr 2023 02:25:42 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1CCE028003C; Mon, 10 Apr 2023 22:25:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 17CFB6B0095; Mon, 10 Apr 2023 22:25:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 06CBF28003C; Mon, 10 Apr 2023 22:25:42 -0400 (EDT) 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 EC0CC6B0093 for ; Mon, 10 Apr 2023 22:25:41 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id A0F2EAC073 for ; Tue, 11 Apr 2023 02:25:41 +0000 (UTC) X-FDA: 80667519282.06.62C04D3 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf02.hostedemail.com (Postfix) with ESMTP id A18608001A for ; Tue, 11 Apr 2023 02:25:37 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=mzNoeW+w; spf=none (imf02.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1681179939; 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=yhPVj9bkaKyOeFej+CfgkaNLlr/1Qr/o0GaaGMTZo/c=; b=EPEY3YIF1gxYeWqxXRkfisGim7Xb+eprgQuSp8651QsMi9UTNJYzk49ahQNvwcEpLg2DNK 9FnDV/oXMfssjyAxh0jOX/wBcvACDT3Kr/Rv1SjsUZnTC2cZZIcoKI4ts9ZKKygwSfOSFP xZIsV7ciHkO9rVbqolAgzfnZ0P3YVRA= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=mzNoeW+w; spf=none (imf02.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1681179939; a=rsa-sha256; cv=none; b=IgSi75o6SVGpvC/z/1DYF+wDz/8A7VQsQEQ0Zm9QiFbvQ2XIr1BeXpknyzFxgZOhHpw1l3 034GEvgEUoGi5u0IWTEobF/To74wbIDKR5QQn9GbR2HukfEHVqUbVq6+IHXbzjeiXXo2dp 2EBnwKVwNhSdSGMmAJ1ZV/sbOO8bBEo= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=yhPVj9bkaKyOeFej+CfgkaNLlr/1Qr/o0GaaGMTZo/c=; b=mzNoeW+wr9QIHGNDW3WjRgQk2j 29wt2EIFds8PQQD106I5Tns9glgc5NmbUGc5PQx8BTm3uOTseisyE1lkjoMB2igmYEAzKQZROd/A9 6Xc+ocbXKbyT9pTCExrPwstOxHw550lolQ1uUUF3x8s7TdsFo/7azyKssLvW2KNYPwtl7cOBq44ZE DbCR80Pu5eDpYmhgXUtJbZXPXsSVMSVCfZTPNHIrJDhw5JuT0HS7rqIncz6Zd4nbogYkiGnNKi18s QwyEGJDcZ3aamkl3KXybuJKRHmtbkonb037tSgQwyD4QH6b3YzVOpL6tnDYfCo12YW4/bqv3z/K7G xyTWtC+w==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pm3h2-005AMa-7J; Tue, 11 Apr 2023 02:25:12 +0000 Date: Tue, 11 Apr 2023 03:25:12 +0100 From: Matthew Wilcox To: kernel test robot Cc: "Liam R. Howlett" , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com, Linus Torvalds , Andrew Morton , maple-tree@lists.infradead.org, Suren Baghdasaryan , stable@vger.kernel.org, syzbot+8d95422d3537159ca390@syzkaller.appspotmail.com Subject: Re: [PATCH 8/8] mm: enable maple tree RCU mode by default. Message-ID: References: <20230327185532.2354250-9-Liam.Howlett@oracle.com> <202304110907.a7339b10-oliver.sang@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202304110907.a7339b10-oliver.sang@intel.com> X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: A18608001A X-Stat-Signature: ssrzqw6xd34hyxar1g1jq4xrbihmzkqg X-HE-Tag: 1681179937-937895 X-HE-Meta: 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 Vvri6rju ewjgMro8DgFAqTyjAloZpJ9bhqpx57m7z7qYVWzLigtBPolFjfP/bJbV9tQnvfMaAbcqOFmHu9uP7Q68xkBLa97jqcoUL8quLL93/3IKtRwGuSpE4dSfiifms2Kp6rXoDaiagnekwyuVLVPe8ZS8NaVe/kPWKmCB5dkZXVTC+nBaxTIo/WYpANB63wjuKu4jyResGxtkukQapLOo8mnWJbVw9p/XCFP0ulx2zThsk1rvBjCzv8INp36UWK1xqM3pt+60N39OyhULodmR59rEGjsyLdg== 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 Tue, Apr 11, 2023 at 09:25:16AM +0800, kernel test robot wrote: > kernel test robot noticed a -8.5% regression of stress-ng.mmapaddr.ops_per_sec on: Assuming this is the test in question: https://github.com/ColinIanKing/stress-ng/blob/master/stress-mmapaddr.c then yes, this is expected. The test calls mmap() and munmap() a lot, and we've made those slower in order to fix a bug. While it does take pagefaults (which is a better test than some microbenchmarks), it only takes one pagefault per call to mmap() and munmap(), which is not representative of real workloads. Thanks for running the test.