Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752954AbbKJNXY (ORCPT ); Tue, 10 Nov 2015 08:23:24 -0500 Received: from mail-wm0-f42.google.com ([74.125.82.42]:33945 "EHLO mail-wm0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751131AbbKJNXW (ORCPT ); Tue, 10 Nov 2015 08:23:22 -0500 Date: Tue, 10 Nov 2015 14:23:19 +0100 From: Michal Hocko To: Vladimir Davydov Cc: Andrew Morton , Johannes Weiner , Tejun Heo , Greg Thelen , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 5/5] Account certain kmem allocations to memcg Message-ID: <20151110132319.GI8058@dhcp22.suse.cz> References: <60b4d1631e3a302246859d6a39ac7c6d6cbf3af3.1446924358.git.vdavydov@virtuozzo.com> <20151109143955.GF8916@dhcp22.suse.cz> <20151110080709.GR31308@esperanza> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151110080709.GR31308@esperanza> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1807 Lines: 45 On Tue 10-11-15 11:07:09, Vladimir Davydov wrote: > On Mon, Nov 09, 2015 at 03:39:55PM +0100, Michal Hocko wrote: [...] > > pipe buffers are trivial to abuse (e.g. via fd passing) so we want to > > You might also mention allocations caused by select/poll, page tables, > radix_tree_node, etc. They all might be abused, but the primary purpose > of this patch set is not catching abusers, but providing reasonable > level of isolation for most normal workloads. Let's add everything above > that in separate patches. Sure I do not have any objections against step by step approach. > > cap those as well. The following should do the trick AFAICS. > > Actually, no - you only account pipe metadata while anon pipe buffer > pages, which usually constitute most of memory consumed by a pipe, still > go unaccounted. I'm planning to make pipe accountable later. You are right! I have missed pipe_write allocates the real page. > > --- > > diff --git a/fs/pipe.c b/fs/pipe.c > > index 8865f7963700..c4b7e8c08362 100644 > > --- a/fs/pipe.c > > +++ b/fs/pipe.c > > @@ -590,7 +590,7 @@ struct pipe_inode_info *alloc_pipe_info(void) > > > > pipe = kzalloc(sizeof(struct pipe_inode_info), GFP_KERNEL); > > if (pipe) { > > - pipe->bufs = kzalloc(sizeof(struct pipe_buffer) * PIPE_DEF_BUFFERS, GFP_KERNEL); > > + pipe->bufs = kzalloc(sizeof(struct pipe_buffer) * PIPE_DEF_BUFFERS, GFP_KERNEL | __GFP_ACCOUNT); > > GFP_KERNEL | __GFP_ACCOUNT are used really often, that's why I > introduced GFP_KERNEL_ACCOUNT. Sure that is better. -- Michal Hocko SUSE Labs -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/