From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f71.google.com (mail-pg0-f71.google.com [74.125.83.71]) by kanga.kvack.org (Postfix) with ESMTP id 7263B6B0033 for ; Mon, 27 Nov 2017 14:57:36 -0500 (EST) Received: by mail-pg0-f71.google.com with SMTP id 199so23758242pgg.20 for ; Mon, 27 Nov 2017 11:57:36 -0800 (PST) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id 2si6487646pgi.574.2017.11.27.11.57.35 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 27 Nov 2017 11:57:35 -0800 (PST) Date: Mon, 27 Nov 2017 20:57:32 +0100 From: Michal Hocko Subject: Re: [PATCH] mm: disable `vm.max_map_count' sysctl limit Message-ID: <20171127195732.3hkfx57d3ytyccvp@dhcp22.suse.cz> References: <23066.59196.909026.689706@gargle.gargle.HOWL> <20171127101232.ykriowhatecnvjvg@dhcp22.suse.cz> <87vahv8whv.fsf@linux.intel.com> <20171127183218.33zm666jw3uqkxdq@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20171127183218.33zm666jw3uqkxdq@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Andi Kleen Cc: Mikael Pettersson , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-api@vger.kernel.org On Mon 27-11-17 19:32:18, Michal Hocko wrote: > On Mon 27-11-17 09:25:16, Andi Kleen wrote: [...] > > The reason the limit was there originally because it allows a DoS > > attack against the kernel by filling all unswappable memory up with VMAs. > > We can reduce the effect by accounting vmas to memory cgroups. As it turned out we already do. vm_area_cachep = KMEM_CACHE(vm_area_struct, SLAB_PANIC|SLAB_ACCOUNT); -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org