From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-f71.google.com (mail-ed1-f71.google.com [209.85.208.71]) by kanga.kvack.org (Postfix) with ESMTP id 068CD6B4C48 for ; Wed, 29 Aug 2018 11:01:39 -0400 (EDT) Received: by mail-ed1-f71.google.com with SMTP id g29-v6so2408248edb.1 for ; Wed, 29 Aug 2018 08:01:38 -0700 (PDT) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id m12-v6si4027433edl.377.2018.08.29.08.01.37 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 29 Aug 2018 08:01:37 -0700 (PDT) Date: Wed, 29 Aug 2018 17:01:36 +0200 From: Michal Hocko Subject: Re: Caching/buffers become useless after some time Message-ID: <20180829150136.GA10223@dhcp22.suse.cz> References: <20180821064911.GW29735@dhcp22.suse.cz> <11b4f8cd-6253-262f-4ae6-a14062c58039@suse.cz> <6ef03395-6baa-a6e5-0d5a-63d4721e6ec0@suse.cz> <20180823122111.GG29735@dhcp22.suse.cz> <76c6e92b-df49-d4b5-27f7-5f2013713727@suse.cz> <8b211f35-0722-cd94-1360-a2dd9fba351e@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: owner-linux-mm@kvack.org List-ID: To: Marinko Catovic Cc: Vlastimil Babka , Christopher Lameter , linux-mm@kvack.org On Wed 29-08-18 16:54:32, Marinko Catovic wrote: [...] > Also if the remote login is not an option, I'm always happy to provide > whatever info you need. trace data which starts _before_ the cache dropdown starts and while it is decreasing should be the first step. Ideally along with /proc/vmstat gathered at the same time. I am pretty sure you have some high order memory consumer which forces the reclaim and we over reclaim. Last data was not really conclusive as it didn't really captured the dropdown IIRC. -- Michal Hocko SUSE Labs