From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cloud1-vm154.de-nserver.de ([178.250.10.56]:51164 "EHLO cloud1-vm154.de-nserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751317AbcKIUT1 (ORCPT ); Wed, 9 Nov 2016 15:19:27 -0500 Subject: Re: spinning kworker with space_cache=v2 searching for free space To: "linux-btrfs@vger.kernel.org" , "bo.li.liu@oracle.com" References: From: Stefan Priebe - Profihost AG Message-ID: Date: Wed, 9 Nov 2016 21:19:21 +0100 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hello, found this one from 2014: https://patchwork.kernel.org/patch/5551651/ it this still valid? Am 09.11.2016 um 09:09 schrieb Stefan Priebe - Profihost AG: > Dear list, > > even there's a lot of free space on my disk: > > # df -h /vmbackup/ > Filesystem Size Used Avail Use% Mounted on > /dev/mapper/stripe0-backup 37T 24T 13T 64% /backup > > # btrfs filesystem df /backup/ > Data, single: total=23.75TiB, used=22.83TiB > System, DUP: total=8.00MiB, used=3.94MiB > Metadata, DUP: total=283.50GiB, used=105.82GiB > GlobalReserve, single: total=512.00MiB, used=0.00B > > I always have a kworker process endless spinning. > > # perf top shows: > 47,56% [kernel] [k] rb_next > 7,71% [kernel] [k] tree_search_offset.isra.25 > 6,44% [kernel] [k] btrfs_find_space_for_alloc > > Mount options: > rw,noatime,compress-force=zlib,nossd,noacl,space_cache=v2,skip_balance > > What's wrong here? > > Greets, > Stefan >