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Set "none" scheduler if available (initramfs)

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Existing zfs initramfs script logic will attempt to set the 'noop'
scheduler if it's available on the vdev block devices. Newer kernels
have the similar 'none' scheduler on multiqueue devices; this change
alters the initramfs script logic to also attempt to set this scheduler
if it's available.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Garrett Fields <ghfields@gmail.com>
Reviewed-by: Richard Laager <rlaager@wiktel.com>
Signed-off-by: Colm Buckley <colm@tuatha.org>
Closes #9042
This commit is contained in:
colmbuckley 2019-08-19 23:11:47 +01:00 committed by Tony Hutter
parent 72dbc01e7f
commit ed235deffd
1 changed files with 13 additions and 6 deletions
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19
contrib/initramfs/scripts/zfs.in
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@ -884,20 +884,27 @@ mountroot()
ZFS_RPOOL="${pool}"
fi
# Set elevator=noop on the root pool's vdevs' disks. ZFS already
# does this for wholedisk vdevs (for all pools), so this is only
# important for partitions.
# Set the no-op scheduler on the disks containing the vdevs of
# the root pool. For single-queue devices, this scheduler is
# "noop", for multi-queue devices, it is "none".
# ZFS already does this for wholedisk vdevs (for all pools), so this
# is only important for partitions.
"${ZPOOL}" status -L "${ZFS_RPOOL}" 2> /dev/null |
awk '/^\t / && !/(mirror|raidz)/ {
dev=$1;
sub(/[0-9]+$/, "", dev);
print dev
}' |
while read i
while read -r i
do
if grep -sq noop /sys/block/$i/queue/scheduler
SCHEDULER=/sys/block/$i/queue/scheduler
if [ -e "${SCHEDULER}" ]
then
echo noop > "/sys/block/$i/queue/scheduler"
# Query to see what schedulers are available
case "$(cat "${SCHEDULER}")" in
*noop*) echo noop > "${SCHEDULER}" ;;
*none*) echo none > "${SCHEDULER}" ;;
esac
fi
done