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 9CDD1C433F5 for ; Mon, 23 May 2022 07:09:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 22CD76B0005; Mon, 23 May 2022 03:09:12 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1DD7A6B0006; Mon, 23 May 2022 03:09:12 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0F51C6B0007; Mon, 23 May 2022 03:09:12 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 0057F6B0005 for ; Mon, 23 May 2022 03:09:11 -0400 (EDT) Received: from smtpin03.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay12.hostedemail.com (Postfix) with ESMTP id BFAE4120CCF for ; Mon, 23 May 2022 07:09:11 +0000 (UTC) X-FDA: 79496131302.03.1C8B3F3 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by imf06.hostedemail.com (Postfix) with ESMTP id 2C6AC180031 for ; Mon, 23 May 2022 07:09:08 +0000 (UTC) Date: Mon, 23 May 2022 09:09:07 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1653289748; 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: in-reply-to:in-reply-to:references:references; bh=9fXGl02y6RMoaaLIdcX/WdBIdoqHbzfOjOVe1GnCbiE=; b=QPcVXQdx4xVhSQNlutu55LBMOkk8goN5Yd+g6Qk9Yhcf7EkeMlTCJzW1nF/JDLQiN2i/mo VjWizzvX3DYgUkZyZ+2uyfx/nvVxb5S4NoY8S641n+BVB4TAH9lhIaFLZ7lVVgaob3pKNm 4pWcVIx8ARh4iCLufnUlYDEXCgoklMoENYGUdkkTQvBClT2iRWIYy+g82n5+gG7nSQpbzk uc2cziWUWFtIhRB6GAyOc7h0U/gsMResXK2mHeQZ1oOlV8jidjXd6V5gsMqOhIX8h8LX+t O6RM8h90/TUwzgfYhoKmiKym5D3RrsugGQi9aEXdVlBCn9Ymi1uwkeHzGWx78g== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1653289748; 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: in-reply-to:in-reply-to:references:references; bh=9fXGl02y6RMoaaLIdcX/WdBIdoqHbzfOjOVe1GnCbiE=; b=pUirtnHH1iEt/KEVCWaqVL0y0hyZIc/JCv0kjCf/2hMeSSRWirZ4kt/fVVPpXhIL51SZmV Y8rSMa3rqAiRXqCA== From: Sebastian Andrzej Siewior To: Stefan Wahren Cc: Marcelo Tosatti , Andrew Morton , Nicolas Saenz Julienne , Borislav Petkov , Minchan Kim , Matthew Wilcox , Mel Gorman , Juri Lelli , Thomas Gleixner , "Paul E. McKenney" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linux ARM , Phil Elwell , regressions@lists.linux.dev Subject: Re: vchiq: Performance regression since 5.18-rc1 Message-ID: References: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <77d6d498-7dd9-03eb-60f2-d7e682bb1b20@i2se.com> X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2C6AC180031 X-Stat-Signature: as7xthmkm6cu7ke4ms311p4swzzuu1jh X-Rspam-User: Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=linutronix.de header.s=2020 header.b=QPcVXQdx; dkim=pass header.d=linutronix.de header.s=2020e header.b=pUirtnHH; dmarc=pass (policy=none) header.from=linutronix.de; spf=pass (imf06.hostedemail.com: domain of bigeasy@linutronix.de designates 193.142.43.55 as permitted sender) smtp.mailfrom=bigeasy@linutronix.de X-HE-Tag: 1653289748-666053 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 2022-05-22 01:22:00 [+0200], Stefan Wahren wrote: > Hi, Hi, > while testing the staging/vc04_services/interface/vchiq_arm driver with my > Raspberry Pi 3 B+ (multi_v7_defconfig) i noticed a huge performance > regression since [ff042f4a9b050895a42cae893cc01fa2ca81b95c] mm: > lru_cache_disable: replace work queue synchronization with synchronize_rcu > > Usually i run "vchiq_test -f 1" to see the driver is still working [1]. What about https://lore.kernel.org/all/YmrWK%2FKoU1zrAxPI@fuller.cnet/ Sebastian