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=-8.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_IN_DEF_DKIM_WL autolearn=ham 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 BE209C43381 for ; Mon, 25 Mar 2019 16:58:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 89E6E20896 for ; Mon, 25 Mar 2019 16:58:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="sCpxCAs9" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729704AbfCYQ6x (ORCPT ); Mon, 25 Mar 2019 12:58:53 -0400 Received: from mail-vs1-f65.google.com ([209.85.217.65]:42591 "EHLO mail-vs1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728912AbfCYQ6w (ORCPT ); Mon, 25 Mar 2019 12:58:52 -0400 Received: by mail-vs1-f65.google.com with SMTP id f15so5803977vsk.9 for ; Mon, 25 Mar 2019 09:58:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=WIoA/MPV58v057b0x/ZPZgd6N3XeCcI0L69t5nexKXc=; b=sCpxCAs919IMpJz4103LqUd6mJ4Lu9SEDPn9eMNLNfOYoNsu9oNJf4pLjjYb3yuEce PsS7l3bi/+C8lXqGoaUPwsryFr+53KUEm9PcJBs95uVOpcSfgPdn2WbCVjel4PBH0Gne KpIsTCILA9xM6nScFDuTSu0L4Cu3KJn+xgX49j4jpOd3fR3RzRoG6gfcvyV+bWp1qodF ZNsvPSrHYi4AHHJ8P/Wc9YuTRBLx1tMnLxELgj+rq7KjYmchAxZ0HdXjsgb0YJuJWuvp 1+aB/FQVmWEy5heBH3va92LU8kSZyRgq0zVmke+EXGYY0YkVWJHbN5eSHTtnf3bN+xdx J1/g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=WIoA/MPV58v057b0x/ZPZgd6N3XeCcI0L69t5nexKXc=; b=oHSnImp96ZicW0otooDMrpR00y1J6b5l7BiTqzyLRSE5QYKc+Ewk2kDXZ5xv3irvT1 HY2Yq3ULYMTE84exgxAR/bFCNOFL27npkjhvETvaNJt0yBGcKduJUJT/GYA81HctZ5H+ bD6CdlRhsxkpRwHndvzkWisKvt5dNvZR865kdUjrsT3KN9r1hrUhuEzqbP6uH86rtWaO O0q771/wmtRQqG6JHU/vMDI5zFtQafEx/fibMFq1kbp+33IJT4sSk7wldiAP5OB8R64e 3ljNZw7tlXaXYPrs17J6UJTyADyxBv49WNO0ZQKjmHvvbSbIPoom0es3PAxYpffn0tUc tCpA== X-Gm-Message-State: APjAAAX6aiG9GZigIdKwot+425dBv6P3XjIzYjCMW/p13jpdua635kLU l++icfXL030kWS325PwVNOneq5xI1s4XM9bw1JTrOA== X-Google-Smtp-Source: APXvYqxe4wsGaJWhBHFzCpF9h9hpU8T1B7OZ0D8ttUJHosW4qYBM+Z3b46Sk/v71Ku5Raha5qW+ntkoGM8OWBdCCWsc= X-Received: by 2002:a67:fa8c:: with SMTP id f12mr12923430vsq.171.1553533131233; Mon, 25 Mar 2019 09:58:51 -0700 (PDT) MIME-Version: 1.0 References: <20190325162052.28987-1-christian@brauner.io> <18683.1553532974@warthog.procyon.org.uk> In-Reply-To: <18683.1553532974@warthog.procyon.org.uk> From: Daniel Colascione Date: Mon, 25 Mar 2019 09:58:38 -0700 Message-ID: Subject: Re: [PATCH 0/4] pid: add pidctl() To: David Howells Cc: Christian Brauner , Jann Horn , khlebnikov@yandex-team.ru, Andy Lutomirski , "Serge E. Hallyn" , "Eric W. Biederman" , Linux API , linux-kernel , Arnd Bergmann , Kees Cook , Alexey Dobriyan , Thomas Gleixner , Michael Kerrisk-manpages , bl0pbl33p@gmail.com, "Dmitry V. Levin" , Andrew Morton , Oleg Nesterov , nagarathnam.muthusamy@oracle.com, Aleksa Sarai , Al Viro , Joel Fernandes Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 25, 2019 at 9:56 AM David Howells wrote: > Daniel Colascione wrote: > > > System calls are cheap. > > Only to a point. x86_64 will have an issue when we hit syscall 512. We're > currently at 427. IIRC, a while ago, someone proposed restarting system call numbering above (again, IIRC) 1024 for both 32- and 64-bit varieties to establish a clean slate and sidestep this problem.