From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AAAF833FE05; Thu, 26 Mar 2026 14:52:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774536764; cv=none; b=EGjg4pzKBBQ+qqFFODJebExJPAGFnJyIxaj0iP/0PjcsYOq3V3XdE3PCvwqOhO7lprTiu2RwO379/P2Jx1FHQFQmhUFRv2sOlPoYCdLOPPCtqiNrxyxSp5WXu5qPWwRlErSsCLJC6bQYzrW9oxCF8pEX9blgl/WfAbE0KqXLSMM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774536764; c=relaxed/simple; bh=WWp2J6XEblP+dVnCSqcs3bjGAghEOzaXbJK75udXCrE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=BVYyGUET+TT+I4wQDs6aCVgB53XSW3kXliaUNIfKIBiblCqb4QsM/36YEtVhWzwhHvSiM4Rnrb+tv4NN0X4M+sBH5KlYivWx0E1k7RGw82or8OdqReEEwHLZo5MBCKggSchgMUQM9qMgBY6KdampMod7xkIz0Szz9KGk9ZtVe14= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iHDQwHCk; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="iHDQwHCk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2727C116C6; Thu, 26 Mar 2026 14:52:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774536764; bh=WWp2J6XEblP+dVnCSqcs3bjGAghEOzaXbJK75udXCrE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=iHDQwHCkYXvFmUYaEea9ADnaYtKR0Wl5Y31qShiPcnpVQVI6o5CiWvDopFwhRtuHc EQMF0GXstN1oiioWXQNpbTjnL3QdOR03KmFZwgWTOCGCPye6cKVbo4sIbg/6JwXklW bKvN45Gi+k3k2cxyG5G2s6Lv1QEoxd37A/pbpTa4= Date: Thu, 26 Mar 2026 15:52:20 +0100 From: Greg KH To: "Ionut Nechita (Wind River)" Cc: namcao@linutronix.de, brauner@kernel.org, linux-fsdevel@vger.kernel.org, linux-rt-users@vger.kernel.org, stable@vger.kernel.org, linux-kernel@vger.kernel.org, frederic@kernel.org, vschneid@redhat.com, chris.friesen@windriver.com, viorel-catalin.rapiteanu@windriver.com, iulian.mocanu@windriver.com Subject: Re: [REGRESSION] =?iso-8859-1?Q?osnoise=3A?= =?iso-8859-1?Q?_=22eventpoll=3A_Replace_rwlock_with_spinlock=22_causes_~5?= =?iso-8859-1?B?MLVz?= noise spikes on isolated PREEMPT_RT cores Message-ID: <2026032640-gangly-sprout-099b@gregkh> References: <20260326140058.272854-1-ionut.nechita@windriver.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260326140058.272854-1-ionut.nechita@windriver.com> On Thu, Mar 26, 2026 at 04:00:57PM +0200, Ionut Nechita (Wind River) wrote: > Hi, > > I'm reporting a regression introduced by commit 0c43094f8cc9 > ("eventpoll: Replace rwlock with spinlock"), backported to stable 6.12.y. Does this regression also show up in the 6.18 release and newer? If so, please work to address it there first, as that is where it needs to be handled first. thanks, greg k-h