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 X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BD19CC2BA83 for ; Fri, 14 Feb 2020 17:53:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A11E8206D7 for ; Fri, 14 Feb 2020 17:53:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388573AbgBNRxH (ORCPT ); Fri, 14 Feb 2020 12:53:07 -0500 Received: from shards.monkeyblade.net ([23.128.96.9]:55832 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388654AbgBNRxE (ORCPT ); Fri, 14 Feb 2020 12:53:04 -0500 Received: from localhost (unknown [IPv6:2601:601:9f00:477::3d5]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id E44AC15CE62F5; Fri, 14 Feb 2020 09:53:03 -0800 (PST) Date: Fri, 14 Feb 2020 09:53:03 -0800 (PST) Message-Id: <20200214.095303.341559462549043464.davem@davemloft.net> To: tglx@linutronix.de Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, bigeasy@linutronix.de, peterz@infradead.org, williams@redhat.com, rostedt@goodmis.org, juri.lelli@redhat.com, mingo@kernel.org Subject: Re: [RFC patch 00/19] bpf: Make BPF and PREEMPT_RT co-exist From: David Miller In-Reply-To: <20200214133917.304937432@linutronix.de> References: <20200214133917.304937432@linutronix.de> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 14 Feb 2020 09:53:04 -0800 (PST) Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org From: Thomas Gleixner Date: Fri, 14 Feb 2020 14:39:17 +0100 > This is a follow up to the initial patch series which David posted a > while ago: > > https://lore.kernel.org/bpf/20191207.160357.828344895192682546.davem@davemloft.net/ > > which was (while non-functional on RT) a good starting point for further > investigations. This looks really good after a cursory review, thanks for doing this week. I was personally unaware of the pre-allocation rules for MAPs used by tracing et al. And that definitely shapes how this should be handled.