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 54E59C7EE2C for ; Tue, 30 May 2023 03:07:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 5A122900002; Mon, 29 May 2023 23:07:46 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 5515E6B0074; Mon, 29 May 2023 23:07:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 41880900002; Mon, 29 May 2023 23:07:46 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 32DF86B0072 for ; Mon, 29 May 2023 23:07:46 -0400 (EDT) Received: from smtpin26.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id EED5780382 for ; Tue, 30 May 2023 03:07:45 +0000 (UTC) X-FDA: 80845436490.26.E9D8906 Received: from out-61.mta1.migadu.com (out-61.mta1.migadu.com [95.215.58.61]) by imf19.hostedemail.com (Postfix) with ESMTP id EBE651A0010 for ; Tue, 30 May 2023 03:07:43 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=mlTKSDp3; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf19.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.61 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1685416064; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=hhVCqVUhvZRjlBrxLBQaFs82AfnvT+az3ouF0P0dHAo=; b=SzVyRl2xc1gyNpQ//Qu39faujuAmaK0hkAPIya0/cKAEdCswe7gnnLmuvbZEOvunoZ2TcV 4JTHlOUaktfXQxoh4kX+Dt8SRppKoqDu/L0zCtncugpzZfz8MTgFGHxNNwvCpwnPQIQNem IFCv58L/RtEh4vV/nMt7Tt88hTMk9E0= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=mlTKSDp3; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf19.hostedemail.com: domain of qi.zheng@linux.dev designates 95.215.58.61 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1685416064; a=rsa-sha256; cv=none; b=Dkmx/Cp54csOsTmCheqtzXJRgeVqZbQSg8ZaI0RxexdVaj5dJNrtn03U4Mfp6PRucPdCMC aIWi8JQnXeN06B16JUYmPqkY8qG4zX4nLJ6Kcy4J/vfUHOoJxS7SiNYsli/EcrgW1nf3TC UOplO3cDZP+nxXKMf6ZX8WMy9wOfzPY= Message-ID: <26da75a6-115f-a17a-73bb-381a6b4a3a75@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1685416060; h=from:from: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:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=hhVCqVUhvZRjlBrxLBQaFs82AfnvT+az3ouF0P0dHAo=; b=mlTKSDp327yaErwS5wPyUOFLhylZtOXgmCsi5D/Ahv65c8fdvz5AEvKl8wwzngX+XQyxB7 3xb9bQMv30BmVUREfvhaXsc5w+Js7ZPspdMxeFle/O48tfkrlr7T8waiZphxSHAtfQN4C0 /8vG5h5z2wHuFeuJA+FakXDh+Wquthg= Date: Tue, 30 May 2023 11:07:29 +0800 MIME-Version: 1.0 Subject: Re: [linus:master] [mm] f95bdb700b: stress-ng.ramfs.ops_per_sec -88.8% regression Content-Language: en-US To: paulmck@kernel.org, Kirill Tkhai Cc: RCU , Yujie Liu , oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org, Andrew Morton , Vlastimil Babka , Roman Gushchin , =?UTF-8?Q?Christian_K=c3=b6nig?= , David Hildenbrand , Davidlohr Bueso , Johannes Weiner , Michal Hocko , Muchun Song , Shakeel Butt , Yang Shi , linux-mm@kvack.org, ying.huang@intel.com, feng.tang@intel.com, fengwei.yin@intel.com References: <202305230837.db2c233f-yujie.liu@intel.com> <896bbb09-d400-ec73-ba3a-b64c6e9bbe46@linux.dev> <44407892-b7bc-4d6c-8e4a-6452f0ee88b9@paulmck-laptop> <095806f1-f7f0-4914-b04b-c874fb25bb83@paulmck-laptop> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Qi Zheng In-Reply-To: <095806f1-f7f0-4914-b04b-c874fb25bb83@paulmck-laptop> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: EBE651A0010 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: 5esmip5un1yykm9w1gshre6ihj17dzuf X-HE-Tag: 1685416063-363791 X-HE-Meta: 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 b9XuR600 O4IOnX/9igRQYUHVsD9ortzBy7stCph638VggyO4dwS0y8MdxILIrueASylhL3ViQV0bFe7QXsz7oka9A1oOIkPPBPHEi3FldUQrEwPdxHl9RGOqIZy+8RUcpI8YbwjBd/jq4vnrZk8GnB9FGEMFY6IR4bFCz0KWLR0Cx1hxjiSApw5Oq0xcPbruhhEFRkd7BtFXq 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: Hi, On 2023/5/29 20:51, Paul E. McKenney wrote: > On Mon, May 29, 2023 at 10:39:21AM +0800, Qi Zheng wrote: [...] >> >> Thanks for such a detailed explanation. >> >> Now I think we can continue to try to complete the idea[1] from >> Kirill Tkhai. The patch moves heavy synchronize_srcu() to delayed >> work, so it doesn't affect on user-visible unregistration speed. >> >> [1]. https://lore.kernel.org/lkml/153365636747.19074.12610817307548583381.stgit@localhost.localdomain/ > > A blast from the past! ;-) > > But yes, moving the long-latency synchronize_srcu() off the user-visible > critical code path can be even better. Yeah, I applied these patches ([PATCH RFC 04/10]~[PATCH RFC 10/10], with few conflicts), the ops/s does get back to the previous levels. I'll continue updating this patchset after doing more testing. Thanks, Qi > > Thanx, Paul