Received: by 2002:a25:4158:0:0:0:0:0 with SMTP id o85csp417574yba; Sat, 20 Apr 2019 05:27:43 -0700 (PDT) X-Google-Smtp-Source: APXvYqwHrWBJjneq8ep+GK25neaI8p0i7VOTBe2b06RrvGorm3S5m8fr7gb/320Up3m2uvOfvutp X-Received: by 2002:a17:902:6bc8:: with SMTP id m8mr332182plt.21.1555763263443; Sat, 20 Apr 2019 05:27:43 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1555763263; cv=none; d=google.com; s=arc-20160816; b=IrdMdRBHO8+jT7eCG5dmwoTpImR9eb0irW7V4fidHkUcK1H+Cpgx39AReMZtpbv6Aq rpDQnXt6WWJ8OqgJO6sQlZRbiR5PbVQJ7fyJVj3PUjPg+Chxj0d/rN26M76vvSFStoO9 3lXuZlFjBIe3HXeav6Mf1D7sKvS2hvX8LkvsWWupWrl/RQFsCErS2u7ch9jtR6ovRF8T avKTuMIgZygBWKZlPqRunTjEqZ+jwi+IZW5HpS66SKyRWsgBbAWVvNo1FZuGJEI0UHjg sKRD7Et4y3v3NQkFwLNsK+Hb88NSZiZ4aYytle7z6V29qXvlFmaLH4X36aDKoY1OZxpn gpcw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=6FFFr99iayYZb1/TvefIZSy91VHr/TCO/P/ta0pmIPA=; b=OT8SH0UdTnmvfPfKjpbpky9ibh5OP2ForF9T3A5S3udWLVzVZJMqPdlbhvpSOafIYJ Jxdavp2N8LGUCpGGJA92Eie1EGtElDCuI4Ro8ebRLFhGC8tiwi7bkVdA6B8EBF/lhK/E DrrQCDPJYaBhvn07bfNdfMQLpeurtF2XBEpl08jXKVLViy6hhf95h4Za9GJaIOJoFIbj Y8Hg9eLdozj1kGaxpt6qYodx92aQpfjDaO+I8KH8HEI0s2Mrft9QT3kZ/umQqmC/LhO4 fRB5glTjcPB+TL6sSRe6KkG2qzPpcuQOI5nNv8YkqHLDmR9QcALnitZ4GuaeNDaPjbZv co8Q== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f10si7240672pgv.589.2019.04.20.05.27.28; Sat, 20 Apr 2019 05:27:43 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728278AbfDTM0Y (ORCPT + 99 others); Sat, 20 Apr 2019 08:26:24 -0400 Received: from mx1.redhat.com ([209.132.183.28]:42406 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725815AbfDTM0Y (ORCPT ); Sat, 20 Apr 2019 08:26:24 -0400 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4E37270D6A; Sat, 20 Apr 2019 12:26:22 +0000 (UTC) Received: from dhcp-27-174.brq.redhat.com (unknown [10.43.17.38]) by smtp.corp.redhat.com (Postfix) with SMTP id AA4955D71C; Sat, 20 Apr 2019 12:26:16 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Sat, 20 Apr 2019 14:26:21 +0200 (CEST) Date: Sat, 20 Apr 2019 14:26:15 +0200 From: Oleg Nesterov To: Christian Brauner 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: <20190420122614.GD17468@redhat.com> References: <20190419190247.GB251571@google.com> <20190419191858.iwcvqm6fihbkaata@brauner.io> <20190419194902.GE251571@google.com> <20190419212002.GB44851@google.com> <20190420115125.GC17468@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190420115125.GC17468@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.28]); Sat, 20 Apr 2019 12:26:23 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 are you all talking about ;) Oleg.