From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lf0-f71.google.com (mail-lf0-f71.google.com [209.85.215.71]) by kanga.kvack.org (Postfix) with ESMTP id 946F46B0005 for ; Tue, 3 May 2016 03:38:00 -0400 (EDT) Received: by mail-lf0-f71.google.com with SMTP id 68so7936094lfq.2 for ; Tue, 03 May 2016 00:38:00 -0700 (PDT) Received: from mail-wm0-f66.google.com (mail-wm0-f66.google.com. [74.125.82.66]) by mx.google.com with ESMTPS id ni8si2450840wjb.211.2016.05.03.00.37.59 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 03 May 2016 00:37:59 -0700 (PDT) Received: by mail-wm0-f66.google.com with SMTP id w143so2194539wmw.3 for ; Tue, 03 May 2016 00:37:59 -0700 (PDT) Date: Tue, 3 May 2016 09:37:57 +0200 From: Michal Hocko Subject: Re: mm: pages are not freed from lru_add_pvecs after process termination Message-ID: <20160503073757.GA28046@dhcp22.suse.cz> References: <5720F2A8.6070406@intel.com> <572766A7.9090406@suse.cz> <20160502150109.GB24419@node.shutemov.name> <572776EF.2070804@intel.com> <20160502160250.GD24419@node.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160502160250.GD24419@node.shutemov.name> Sender: owner-linux-mm@kvack.org List-ID: To: "Kirill A. Shutemov" Cc: Dave Hansen , Vlastimil Babka , "Odzioba, Lukasz" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "Shutemov, Kirill" , "Anaczkowski, Lukasz" On Mon 02-05-16 19:02:50, Kirill A. Shutemov wrote: > On Mon, May 02, 2016 at 08:49:03AM -0700, Dave Hansen wrote: > > On 05/02/2016 08:01 AM, Kirill A. Shutemov wrote: > > > On Mon, May 02, 2016 at 04:39:35PM +0200, Vlastimil Babka wrote: > > >> On 04/27/2016 07:11 PM, Dave Hansen wrote: > > >>> 6. Perhaps don't use the LRU pagevecs for large pages. It limits the > > >>> severity of the problem. > > >> > > >> I think that makes sense. Being large already amortizes the cost per base > > >> page much more than pagevecs do (512 vs ~22 pages?). > > > > > > We try to do this already, don't we? Any spefic case where we have THPs on > > > pagevecs? > > > > Lukas was hitting this on a RHEL 7 era kernel. In his kernel at least, > > I'm pretty sure THP's were ending up on pagevecs. Are you saying you > > don't think we're doing that any more? > > As Vlastimil pointed, we do. It need to be fixed, I think. It seems that offloading the draining to the vmstat context doesn't look terribly bad. Don't we rather want to go that way? -- 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