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 D80826B0006 for ; Mon, 6 Aug 2018 14:16:40 -0400 (EDT) Received: by mail-ed1-f71.google.com with SMTP id i24-v6so4503407edq.16 for ; Mon, 06 Aug 2018 11:16:40 -0700 (PDT) Received: from mx1.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id h29-v6si960390edb.301.2018.08.06.11.16.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 Aug 2018 11:16:39 -0700 (PDT) Date: Mon, 6 Aug 2018 20:16:38 +0200 From: Michal Hocko Subject: Re: Caching/buffers become useless after some time Message-ID: <20180806181638.GE10003@dhcp22.suse.cz> References: <20180730144048.GW24267@dhcp22.suse.cz> <1f862d41-1e9f-5324-fb90-b43f598c3955@suse.cz> <30f7ec9a-e090-06f1-1851-b18b3214f5e3@suse.cz> <20180806120042.GL19540@dhcp22.suse.cz> <010001650fe29e66-359ffa28-9290-4e83-a7e2-b6d1d8d2ee1d-000000@email.amazonses.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <010001650fe29e66-359ffa28-9290-4e83-a7e2-b6d1d8d2ee1d-000000@email.amazonses.com> Sender: owner-linux-mm@kvack.org List-ID: To: Christopher Lameter Cc: Marinko Catovic , Vlastimil Babka , linux-mm@kvack.org On Mon 06-08-18 15:37:14, Cristopher Lameter wrote: > On Mon, 6 Aug 2018, Michal Hocko wrote: > > > Because a lot of FS metadata is fragmenting the memory and a large > > number of high order allocations which want to be served reclaim a lot > > of memory to achieve their gol. Considering a large part of memory is > > fragmented by unmovable objects there is no other way than to use > > reclaim to release that memory. > > Well it looks like the fragmentation issue gets worse. Is that enough to > consider merging the slab defrag patchset and get some work done on inodes > and dentries to make them movable (or use targetd reclaim)? Is there anything to test? -- Michal Hocko SUSE Labs