From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 8B5E338F63D for ; Mon, 13 Jul 2026 07:32:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783927923; cv=none; b=Jf4lg0qVNALLFqRV2iX23m9dnVzX35zMZ+F/8gYNX4fl0hd5aph+d7SoXrP+xhB3dX7zebrYYOt/I9f0YfcwMIdutiX/b3tIJNUpNFWWRNHP630DDLOsUV63qSY8itPbrQMuZ9I7pSIet9QAfeW/2Uld5RvZOrgiUFbiPflgEB0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783927923; c=relaxed/simple; bh=GCFNw7yoOEaZPIMYweHWnYZkMho8PhFCdAZweeUSrvM=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lvlNmVWQWQdTvmA84IE5ajeFAat/agO4HtM4oiaHTW7uSIfZogMuTm3+4aWrnwBG0M2B6NAUu2DjB5pohishaSXe8cZRDX6SiMDzaV+ObFrteatYg6MJInE+phJbpP7XCU4VR+nbv/al9xPfJN87vi/gplLp9cF3ZUvtvU8o1FU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=ZyRRVaaN; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=d10LyRPT; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="ZyRRVaaN"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="d10LyRPT" Date: Mon, 13 Jul 2026 09:31:58 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1783927920; 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=eTEFeO/5EIAP2AE6MFktsovFd8RdOZrL0IsFXTdIgCk=; b=ZyRRVaaN/a7Av7n45HMCnrFZ7sdvcF8hzCP7uNhbjBapw+aHEDtJjnEs1CrWFw+3ZF2hIv M3jHDVpzqCTVy5G9o5i9LomO/JobmAY9Pz7BMLALFhrVUWJDzrl6lnP1W5As75Uoio+A5w MfIcfb5hkJuJI5oX6N7sHyWavnOgSsI4N1ZJLcXZrbLDcwxD1dnFZSIRBJqDrLp8YLiJnj XAog1JjTU0XA1iv8403f5UcFofcWj69AZt78QBnKQa89hqhHGZGm8vFUTzlQKlRFYg+XoH 2rfRcwR6Jvj2iu3gM56+RHj6Oz3Mvla6+PSMdIiAO+Vfsfn5CgVrCWF8RDyMxQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1783927920; 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=eTEFeO/5EIAP2AE6MFktsovFd8RdOZrL0IsFXTdIgCk=; b=d10LyRPTmTNrbrJWbIolbyfdJhyGilwIxdwRklGSZNFcKFiW1zxvaina3PckVO0/A6wCzL oy0ppVgdLkkzKUDA== From: Sebastian Andrzej Siewior To: Leonardo Bras Cc: Jonathan Corbet , Shuah Khan , Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng , Waiman Long , Andrew Morton , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jann Horn , Pedro Falcato , Brendan Jackman , Johannes Weiner , Zi Yan , Harry Yoo , Hao Li , Christoph Lameter , David Rientjes , Roman Gushchin , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Qi Zheng , Shakeel Butt , Axel Rasmussen , Yuanchu Xie , Wei Xu , "Borislav Petkov (AMD)" , Randy Dunlap , Feng Tang , Dapeng Mi , Kees Cook , Marco Elver , Jakub Kicinski , Li RongQing , Eric Biggers , "Paul E. McKenney" , Nathan Chancellor , Nicolas Schier , Miguel Ojeda , Thomas =?utf-8?Q?Wei=C3=9Fschuh?= , Thomas Gleixner , Douglas Anderson , Gary Guo , Christian Brauner , Pasha Tatashin , Coiby Xu , Masahiro Yamada , Frederic Weisbecker , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-rt-devel@lists.linux.dev, Marcelo Tosatti Subject: Re: [PATCH v4 3/4] swap: apply new pw_queue_on() interface Message-ID: <20260713073158.CHjwei-N@linutronix.de> References: <20260519012754.240804-1-leobras.c@gmail.com> <20260519012754.240804-4-leobras.c@gmail.com> <20260520150736.HZnlFkv7@linutronix.de> Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: On 2026-07-12 18:43:48 [-0300], Leonardo Bras wrote: > > I thought that this improved since commit > > ff042f4a9b050 ("mm: lru_cache_disable: replace work queue synchronization with synchronize_rcu") > > > > Did it get worse or was it not entirely gone? > > > > I worked in this patchset majorly after that commit date, and it was still > an issue up to last time Marcelo tested. Not sure of the impact of above > commit, but I suppose it may have brought some improvements without fully > fixing it. It would be good to know what is still missing and maybe it can be addressed without introducing this remote locking. > Thanks! > Leo Sebastian