Received: by 2002:ac0:a5b6:0:0:0:0:0 with SMTP id m51-v6csp610491imm; Tue, 5 Jun 2018 01:16:10 -0700 (PDT) X-Google-Smtp-Source: ADUXVKLv87iq+IhNklNn+MVpM16gQ8sqDiJizEbz28JCiI0R3NXW6Iv42SsbzQ+Bys7Y1xhoL3WC X-Received: by 2002:a63:ad08:: with SMTP id g8-v6mr19641179pgf.74.1528186570556; Tue, 05 Jun 2018 01:16:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1528186570; cv=none; d=google.com; s=arc-20160816; b=C7+SSrFAHLtvYDB535TW11pPF9d0K+uSxL5IYBl7dDLpYogCfSMVYWUszVR1Z6Qt/L 7+Hyb74X5RB1SU3Jrx5KHix2tx4Dyd5q4u5kkeqH9klnqheYiwBqR2BABpE+unb2mabF ILKEjsKokgb6nbe7ku+N/iPOHuWRjGbAUato3rDIEGTez3b2Ry/B0CX5EYC5PyuDgqhL Ylxd7VaXcODZlKX3Gn615nM+lYNy2tejhEqCXj2+w3g99swY753dsQYpcX99v3gVZZ59 Fgne9gQOyvKDSV5X/ydCkDLk+qUnHWvlYGadRCzH5vpPBAi3aaahGAkNpE3FUG8oX+u8 HdPA== 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:arc-authentication-results; bh=EyWoeTnFQf7QplrCVHprJKQmnhVmE18tEIcuYTpKtUQ=; b=LN8b6vFzbACxvY4OB3HYqoIGxQV5wXYgDep7se8/zMsOrW/Z7Mnd4RVLZoUKbpAnWn yhZTdVwhISs5Ll/+iNSalCGVVPCAnAuseIL23VYoy9DFG6yr5HuCzDv/hRuB9RHo+gzw OEyRE8akVtz7O4kUpYVfHUhXPLgP79YIIOJ0zhtbM3ML5ktlJiiyKIGdmjillmuh0ExP owSg8WbH+8wC2oPm0FnEtAw0nnKjl2hf2/fKGTiwEOW00J/j10WXmHBNkK1ZKduuK9Aw ErxoaLGKSCcEJMEEt8N3StDNhcKlhy7tSImlDNS1XzOUpgT5rfClLyX5YqLMHrdoG5r6 aMxg== 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=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id f12-v6si4095188pgn.459.2018.06.05.01.15.44; Tue, 05 Jun 2018 01:16:10 -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=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751554AbeFEIPF (ORCPT + 99 others); Tue, 5 Jun 2018 04:15:05 -0400 Received: from mx2.suse.de ([195.135.220.15]:46501 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751495AbeFEIPE (ORCPT ); Tue, 5 Jun 2018 04:15:04 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (charybdis-ext-too.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id EE9B0AC4A; Tue, 5 Jun 2018 08:15:02 +0000 (UTC) Date: Tue, 5 Jun 2018 10:15:01 +0200 From: Michal Hocko To: "Eric W. Biederman" Cc: Kirill Tkhai , akpm@linux-foundation.org, peterz@infradead.org, oleg@redhat.com, viro@zeniv.linux.org.uk, mingo@kernel.org, paulmck@linux.vnet.ibm.com, keescook@chromium.org, riel@redhat.com, tglx@linutronix.de, kirill.shutemov@linux.intel.com, marcos.souza.org@gmail.com, hoeun.ryu@gmail.com, pasha.tatashin@oracle.com, gs051095@gmail.com, dhowells@redhat.com, rppt@linux.vnet.ibm.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/4] exit: Make unlikely case in mm_update_next_owner() more scalable Message-ID: <20180605081501.GT19202@dhcp22.suse.cz> References: <152473763015.29458.1131542311542381803.stgit@localhost.localdomain> <20180426130700.GP17484@dhcp22.suse.cz> <877enj9uwf.fsf@xmission.com> <20180601135725.GE15278@dhcp22.suse.cz> <87a7sey3ud.fsf@xmission.com> <20180601150219.GG15278@dhcp22.suse.cz> <87y3fyv88o.fsf@xmission.com> <20180604065425.GF19202@dhcp22.suse.cz> <87r2lmlj1p.fsf@xmission.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <87r2lmlj1p.fsf@xmission.com> User-Agent: Mutt/1.9.5 (2018-04-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 04-06-18 09:31:46, Eric W. Biederman wrote: [...] > My key point is that it is easy to trigger which makes the current > mm_update_next_owner a fundamentally flawed design, and something that > needs to be fixed. Ohh, absolutely agreed! I was not trying to argue that part of course. -- Michal Hocko SUSE Labs