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=-2.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 48B91CA9EC9 for ; Fri, 18 Oct 2019 05:54:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1238920820 for ; Fri, 18 Oct 2019 05:54:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XZ3mjYmC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391955AbfJRFyu (ORCPT ); Fri, 18 Oct 2019 01:54:50 -0400 Received: from mail-pg1-f195.google.com ([209.85.215.195]:37763 "EHLO mail-pg1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727328AbfJRFyu (ORCPT ); Fri, 18 Oct 2019 01:54:50 -0400 Received: by mail-pg1-f195.google.com with SMTP id p1so2735088pgi.4 for ; Thu, 17 Oct 2019 22:54:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=O64k64LFwOm51ZSh8xkoD1TCVFNCTSCla81D5pSJ7kw=; b=XZ3mjYmCEMuMa2vmopUKHKPKXqQcrSlMRexjLnfWoaWYV7KsE0DHJ3TZyovBqopaxN dyvF/McWfSNbORm39kBOBJB6o0sPlatc9XXFCIPRgcpqFHeiQu9DC4ypYTyjz7DP6Zl4 27X6AmzkQXCVy4Og4vZXta8Kr+9nRemz9g0kmmot5DLJsIf5N2Gmq7RHK0qVTpx7VHco DTdlyaKGu50zpJ0S2hlcg0wRFQSJmHrfVwqCvOES5pHi+GN7NdMKh/xWj+/djnYLvj+C qpqdK+UKUNWYLR7Yvfw/3AZt88NyA3fYVYDnQLe4ApjZymp/uhvmR3iNaozjxJ0eWaHx Tv7Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=O64k64LFwOm51ZSh8xkoD1TCVFNCTSCla81D5pSJ7kw=; b=UICfmTKPNbyoPfj5zOCZnIl0mCdFDCeZb94RC9TDeeincfaF9DKkRDKFNDfeMtZe83 AND0pIakgW5PyRygFfsF7/18ZzpKdo8TW76sO5d4YfDV1SAiLrjI/U4DUBz1ppoQmHez vQ4gSkDLI78q7oUovp7g8yzMYXi+9uULOKjt0J5lUgDF4G84n3uz9Zjdu6An4iOtO7+1 2QJR4p96dvymB1g/VF/ftgaJunirPI0K/EDyeV8uUOTebyr1iy/Qi2LxD+QqeYVatsyz eBmgzKccuoL01NEBA1SiQgwGYt8qAiKNOu+U8jpBBlf39PgQGscNudWoNr5uw8RnZ0fZ 54XA== X-Gm-Message-State: APjAAAUtwlR23KdTnF220TblZeJn1iknyw8WqD2Rt7rTyI6Z4/M54Ikz vjpIO8iheI2ZIERi1RpY5AM= X-Google-Smtp-Source: APXvYqwGoOzI2HEUfmjzn/oM+s/j3UivCjqY4aPk+FPhrvreB9pgZclNsdKlVhOPDAER3GN4fx1vSQ== X-Received: by 2002:a63:6782:: with SMTP id b124mr8649462pgc.220.1571378089797; Thu, 17 Oct 2019 22:54:49 -0700 (PDT) Received: from ast-mbp ([2620:10d:c090:180::cfd0]) by smtp.gmail.com with ESMTPSA id s14sm4242415pfe.52.2019.10.17.22.54.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 17 Oct 2019 22:54:48 -0700 (PDT) Date: Thu, 17 Oct 2019 22:54:47 -0700 From: Alexei Starovoitov To: David Miller Cc: williams@redhat.com, tglx@linutronix.de, bigeasy@linutronix.de, daniel@iogearbox.net, bpf@vger.kernel.org, ast@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, peterz@infradead.org, acme@redhat.com Subject: Re: [PATCH] BPF: Disable on PREEMPT_RT Message-ID: <20191018055445.wpesq2xmeu7v6ysg@ast-mbp> References: <20191017.132548.2120028117307856274.davem@davemloft.net> <20191017214917.18911f58@tagon> <20191017.215739.1133924746697268824.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191017.215739.1133924746697268824.davem@davemloft.net> User-Agent: NeoMutt/20180223 Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org On Thu, Oct 17, 2019 at 09:57:39PM -0700, David Miller wrote: > From: Clark Williams > Date: Thu, 17 Oct 2019 21:49:17 -0500 > > > BPF programs cannot loop and are limited to 4096 instructions. > > The limit was increased to 1 million not too long ago. Right. And it's easy to limit to 100 instructions per program for PREEMPT_RT. I doubt it's necessary.