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=-3.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_NEOMUTT autolearn=unavailable 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 8BEE3C282E3 for ; Sat, 20 Apr 2019 12:35:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 49F7121871 for ; Sat, 20 Apr 2019 12:35:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=brauner.io header.i=@brauner.io header.b="J7gchnRQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726728AbfDTMfK (ORCPT ); Sat, 20 Apr 2019 08:35:10 -0400 Received: from mail-ed1-f67.google.com ([209.85.208.67]:35651 "EHLO mail-ed1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726100AbfDTMfJ (ORCPT ); Sat, 20 Apr 2019 08:35:09 -0400 Received: by mail-ed1-f67.google.com with SMTP id y67so6353928ede.2 for ; Sat, 20 Apr 2019 05:35:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brauner.io; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=lfS4jHQHDZpV/nXsHbcDnf57yfYUP32gdciwif1OGGI=; b=J7gchnRQD/fUtkqWGlccOk74KJNsIQOx48hIxszBYnesbNZHkVH0YTeppDOtGWfWSi fI/aA8zB3u8WgIjObQDmW3ukULvUTYL0ogvV9TDETVrXzc8q4xPNSpqEoXOj/FIx/dNM 0F+OwzDNkcilQiICD4QteNiMTXTKfekzQXmLqqVgCqqx/yrkkJmL41p2Kcjz4YU0KocL 0E+UPlFFB/tP8cQx58COuSTdTyw5Ae4OOaoSdz1w4DxlKhv/1aJvJkhMbeckO0b5CHXQ 3l7oDP2GMGuK9+0sUnxjXJxbkRqRHkvoErHqg7GsE1JEbpFptR00tCsu5ePQZmwsPdJX gjXw== 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=lfS4jHQHDZpV/nXsHbcDnf57yfYUP32gdciwif1OGGI=; b=OPuTSxl1HYOLmngabLtYW9pbylZO2HHMzgCMvo/fzv3syjt7obRquJlMgQ+5vkuBnu GXr5uHYyadtQP1Bx2Wsuh26zRZheejzbURkXjcFOdpCwWo1uXzSsK3hXYhUuMNAB43vM BwJ8NcnGV3qcdMibpG02L+19vp6/8hZ0AXDcMrFXobUChe19nyzRfG0GTfjkxPcKmLYm GYPRl4nqQ8TJZfZYDSgMTgejTXrILPQjilmK1s6qHqMG1a3n/EdUeMKor4o2ss1T5gr4 AjIa4x4Zw//JD7BTTg+oaWM39nK4JRCihPEwTA/A1gFNJ+LiUvKSt+ew2CqyarjxCNYQ 0nvg== X-Gm-Message-State: APjAAAVtEExYHs5IEK309AEAIX6Gh7iNdRUkp6PxRNc6E1UEM4VhVEYc S5YyfZ/FvK52ojMrh/gv9Z8d5A== X-Google-Smtp-Source: APXvYqyyrtC1nJRCk3xC0Q5ImPiI6D+SOjremXeJ9tic2+JtroW6/DiWbdX1kU2+EyySp/1lbN2uXg== X-Received: by 2002:a17:906:4d4d:: with SMTP id b13mr4392645ejv.256.1555763707826; Sat, 20 Apr 2019 05:35:07 -0700 (PDT) Received: from brauner.io ([212.91.227.56]) by smtp.gmail.com with ESMTPSA id i9sm2128976edk.56.2019.04.20.05.35.06 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 20 Apr 2019 05:35:07 -0700 (PDT) Date: Sat, 20 Apr 2019 14:35:05 +0200 From: Christian Brauner To: Oleg Nesterov Cc: Joel Fernandes , Daniel Colascione , Jann Horn , Florian Weimer , kernel list , Andy Lutomirski , Steven Rostedt , Suren Baghdasaryan , Linus Torvalds , Alexey Dobriyan , Al Viro , Andrei Vagin , Andrew Morton , Arnd Bergmann , "Eric W. Biederman" , Kees Cook , linux-fsdevel , "open list:KERNEL SELFTEST FRAMEWORK" , Michal Hocko , Nadav Amit , Serge Hallyn , Shuah Khan , Stephen Rothwell , Taehee Yoo , Tejun Heo , Thomas Gleixner , kernel-team , Tycho Andersen Subject: Re: [PATCH RFC 1/2] Add polling support to pidfd Message-ID: <20190420123504.gohscgeahp45hjd3@brauner.io> References: <20190419190247.GB251571@google.com> <20190419191858.iwcvqm6fihbkaata@brauner.io> <20190419194902.GE251571@google.com> <20190419212002.GB44851@google.com> <20190420115125.GC17468@redhat.com> <20190420122614.GD17468@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20190420122614.GD17468@redhat.com> User-Agent: NeoMutt/20180716 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Sat, Apr 20, 2019 at 02:26:15PM +0200, Oleg Nesterov wrote: > On 04/20, Oleg Nesterov wrote: > > > > Note that we need > > thread_group_empty() only for the case when the task is traced, > > Damn, sorry for noise... of course this is not true, I tried to say that > notification won't come otherwise. Nevermind, lets discuss this when we > have a patch. I already got lost in this thread and I have no idea what Agreed. The polling work is not targeted for the 5.2 merge window anyway so there's no need to rush this. > are you all talking about ;) Nothing patch-worthy comes without a solid portion of controversy and confusion at first. ;) Christian