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 8FE6E1C57A5; Wed, 20 Nov 2024 14:57:48 +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=1732114670; cv=none; b=M+StwRJDayqefBJ2MsYgjsaQr7Pwg1pxE0aFm9DCxf/H9cSf/K86zxmbQ04j4oFotKHwhVkduNzIr3QjnBoIopGVKQ2zrz9RNVahkNTZbf9X2r/6KSSpCeqHSCeCUpv4RgJ3TC89tAlXkJ89QalM8ta64T9wekeSFdUsYuAzQn0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732114670; c=relaxed/simple; bh=w4RwPLlFWRfw71b5zlZiK0uQ/mhhhRbkndbVxlkKVxE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=jmjXmv8ofnjMIxyvIq7GJ9oY7A9oV9pHTF8I2GErlTsYuchZvrmTs7bb5WV92zhzOZSc5ljel/HATvL96VPRAwwMxR4M6aoPoLI9zrkNIxddLebzajKL0GFeaG8UCfzhvewbXwbLELhL0sDy5ndh8roysBC0Pa+GYzuELL5uIwQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=q91erEAQ; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none 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="q91erEAQ" 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=w4RwPLlFWRfw71b5zlZiK0uQ/mhhhRbkndbVxlkKVxE=; b=q91erEAQYnhO6SfqnSd5192dsu TqmUxmxU42V0DCFscJVyv7suDTDbuCguDIG4UHdvpu6y2+t82htk8umoOsHCgIuShf63PZRJ4n/DL m5OI36m7dcMC4WYTvPhcUsXymjngJuHK8rzEE4/hnL68pXrGHFdexCyA2HaKm3Ue2oM/yXBW9fSBb RoI48xNyA/c2G5AoPjyKbD1fgE/Q6donR5arZSuCXM7ldb+3RN1xSrK6T37B24YTKEomu2ldBFIhj vgDoNYHII0bMtq6zSccJvlvraP++zCqREJM3vLTgblrxAkrFSqxssrc85DQ4DiI5zYMvOrfamAd4S uvjrPf8Q==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tDm9J-00000005Mwt-2JtI; Wed, 20 Nov 2024 14:57:46 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 722643006AB; Wed, 20 Nov 2024 15:57:46 +0100 (CET) Date: Wed, 20 Nov 2024 15:57:46 +0100 From: Peter Zijlstra To: Josh Poimboeuf Cc: Valentin Schneider , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, kvm@vger.kernel.org, linux-mm@kvack.org, bpf@vger.kernel.org, x86@kernel.org, rcu@vger.kernel.org, linux-kselftest@vger.kernel.org, Steven Rostedt , Masami Hiramatsu , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Paolo Bonzini , Wanpeng Li , Vitaly Kuznetsov , Andy Lutomirski , Frederic Weisbecker , "Paul E. McKenney" , Neeraj Upadhyay , Joel Fernandes , Josh Triplett , Boqun Feng , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Andrew Morton , Uladzislau Rezki , Christoph Hellwig , Lorenzo Stoakes , Jason Baron , Kees Cook , Sami Tolvanen , Ard Biesheuvel , Nicholas Piggin , Juerg Haefliger , Nicolas Saenz Julienne , "Kirill A. Shutemov" , Nadav Amit , Dan Carpenter , Chuang Wang , Yang Jihong , Petr Mladek , "Jason A. Donenfeld" , Song Liu , Julian Pidancet , Tom Lendacky , Dionna Glaze , Thomas =?iso-8859-1?Q?Wei=DFschuh?= , Juri Lelli , Marcelo Tosatti , Yair Podemsky , Daniel Wagner , Petr Tesarik Subject: Re: [RFC PATCH v3 06/15] jump_label: Add forceful jump label type Message-ID: <20241120145746.GL38972@noisy.programming.kicks-ass.net> References: <20241119153502.41361-1-vschneid@redhat.com> <20241119153502.41361-7-vschneid@redhat.com> <20241119233902.kierxzg2aywpevqx@jpoimboe> <20241120145649.GJ19989@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-doc@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: <20241120145649.GJ19989@noisy.programming.kicks-ass.net> On Wed, Nov 20, 2024 at 03:56:49PM +0100, Peter Zijlstra wrote: > But I think we can make the fall-back safer, we can simply force the IPI > when we poke at noinstr code -- then NOHZ_FULL gets to keep the pieces, > but at least we don't violate any correctness constraints. I should have read more; that's what is being proposed.