From: Christian Brauner <christian.brauner@ubuntu.com>
To: "Darrick J. Wong" <djwong@kernel.org>, Christoph Hellwig <hch@lst.de>
Cc: linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org
Subject: swapfile warnings
Date: Thu, 25 Mar 2021 16:41:29 +0100 [thread overview]
Message-ID: <20210325154129.wf2qiwuybv7sad5j@wittgenstein> (raw)
Hey,
I've been running xfstests on a v5.12-rc3 kernel using a swapfile:
ubuntu@edfu|~
> cat /etc/fstab
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
# / was on /dev/sdb1 during curtin installation
/dev/disk/by-uuid/f2c4df25-b55c-4d1b-95fa-059f72ef86eb / ext4 defaults 0 0
/swap.img none swap sw 0 0
where my rootfs is ext4:
ubuntu@edfu|~
> findmnt | grep -i ext4
/ /dev/sdb1 ext4 rw,relatime
In addition to the /dev/sdb disk I have three other disks attached:
ubuntu@edfu|~
> lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 55.5M 1 loop /snap/core18/1988
loop1 7:1 0 69.9M 1 loop /snap/lxd/19188
loop2 7:2 0 70.4M 1 loop /snap/lxd/19647
loop3 7:3 0 32.3M 1 loop /snap/snapd/11107
loop4 7:4 0 32.3M 1 loop /snap/snapd/11402
sda 8:0 0 931.5G 0 disk
sdb 8:16 0 223.6G 0 disk
└─sdb1 8:17 0 223.6G 0 part /
sdc 8:32 0 279.5G 0 disk
sdd 8:48 0 931.5G 0 disk
I'm using two of them /dev/sdc and /dev/sdb for xfstests:
ubuntu@edfu|~/src/git/xfstests
> cat local.config
# Ideally define at least these 4 to match your environment
# The first 2 are required.
# See README for other variables which can be set.
#
# Note: SCRATCH_DEV >will< get overwritten!
export FSTYP=xfs
export TEST_DEV=/dev/sdc
export TEST_DIR=/mnt/test
export SCRATCH_DEV=/dev/sdd
export SCRATCH_MNT=/mnt/scratch
when the system gets under load during test runs I assume it sometimes
swaps and so sometimes I see the following messages pop up:
> sudo journalctl | grep -i swapon
Mar 21 00:00:58 edfu kernel: swapon: file has shared extents
Mar 21 02:25:52 edfu kernel: swapon: file has unallocated extents
Mar 21 21:38:12 edfu kernel: swapon: file has shared extents
Mar 22 00:16:03 edfu kernel: swapon: file has unallocated extents
Mar 23 11:49:46 edfu kernel: swapon: file has shared extents
Mar 23 12:34:38 edfu kernel: swapon: file has unallocated extents
I don't know enough about swapfiles to make any deep observations but I
wonder what this can be caused by and whether this is something to worry
about.
Christian
next reply other threads:[~2021-03-25 15:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-25 15:41 Christian Brauner [this message]
2021-03-25 15:49 ` swapfile warnings Darrick J. Wong
2021-03-25 16:20 ` Christian Brauner
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