From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 928FE1DDC33; Tue, 22 Sep 2026 07:24:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790061878; cv=none; b=pZX1QH1hHx8WPA05AamSQita/PQXr/ZaiTFyGiII5YLtFMu0762HJEWZJIJtw0VFk69FNNO3/b39rysghY3ug3EwH1PclRZg+t/J9yMIIO/ItTW4YX0PsGVwH1wdVoNL9b52RjmjthF1AXE+t0pu4nit+DDoTxeA5LjcN4KFnL4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790061878; c=relaxed/simple; bh=AphToBMiKdpkW4jJyGrkF0MLgHLvibg8+sFDnX92rXU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=WkG6yrk36EbSmWkytkPawSVlD3QYqQvyLEyETErLQuz8MDaqWIWxbwssxKLWNetB3bhJC7PIck97IvMWsYH6HcbH3NwsCzQnFskZ1J5JKIqFc9B2ZnqCjqIlTqJwCkpjOxQcAMaFdnFSnAP7W/jv0IpCPat9aQhAtUa+pkuyBmU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=pass smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ZljLmvs9; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ZljLmvs9" 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=OdJLflAlPG2srZDj55Kplumdt/HlutALrygg5uboHCg=; b=ZljLmvs9ZpjUSMwVeNapnu9yQW bR4eSE1Y7mhFS2+g1kSyyZU24sd90De3F+IE+8ZpWQVqbI4UWfI6MOO4EVCOAbHIUb8G7FTPXNZQ+ zHhaaauBp6/etPY1cYGIeFssIs2ve4iIpnkAdMSCgCeePrOBqlC533SUpgdp0sGs+CAEgqcxpmRqv u4ZE9wd8xRrgZ4lMPZ6mTWTm9KKnv1dwpvdTxIK+BF0ikHIhWB+3qiN4AA2gjbKN0OaIkEOpj/tvr 0I6kaNTzsihN5aPn/nWepBC4pMSUTPZn7Wp/hm297NaxViUbCXbGY1nvj/M57y6tysU2MxwEFz833 sZlyoGcw==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1x8ur3-00000007UwY-1ISQ; Tue, 22 Sep 2026 07:23:53 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id D97213008D6; Tue, 22 Sep 2026 09:23:52 +0200 (CEST) Date: Tue, 22 Sep 2026 09:23:52 +0200 From: Peter Zijlstra To: Tim Chen Cc: Ingo Molnar , Lu Wang , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , K Prateek Nayak , Kees Cook , Christian Brauner , Alexander Viro , Jan Kara , Shrikanth Hegde , Qais Yousef , Aaron Lu , Srikar Dronamraju , Vineeth Remanan Pillai , Ricardo Neri-Calderon , Chen Yu , Hyunwoo Kim , Zhan Xusheng , Zhan Xusheng , Yi Lai , "Rafael J . Wysocki" , Greg Kroah-Hartman , Danilo Krummrich , Zenghui Yu , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, stable@kernel.org Subject: Re: [PATCH v2 2/6] sched/cache: Honor migrate_llc_task semantics in active load balance Message-ID: <20260922072352.GW4121339@noisy.programming.kicks-ass.net> References: Precedence: bulk X-Mailing-List: linux-kernel@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: On Mon, Sep 21, 2026 at 05:37:23PM -0700, Tim Chen wrote: > From: Lu Wang > > CAS introduced the migrate_llc_task migration type to direct tasks FWIW, every time I read this I get confused, CAS maps to Compare-And-Swap, aka cmpxchg on x86.