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ext4/305: reduce runtime by limiting mount/umount cycles

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ext4/305 sleeps 3 minutes and does mount/umount loop in background,
which produces lots of logs in dmesg and 3 minutes is not necessary.

Ted pointed out that 30 mount/umount cycles is enough to crash a buggy
kernel, so just limit the mount/umount loop to reduce the runtime. And
now the runtime is about 2s.

Reported-by: Theodore Ts'o <tytso@mit.edu>
Suggested-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Eryu Guan
2015-09-21 13:06:17 +10:00
committed by Dave Chinner
parent 48613832ad
commit 6c5493bd58
1 changed files with 9 additions and 10 deletions
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tests/ext4/305
+9 -10
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@@ -53,19 +53,18 @@ DEV_BASENAME=$(_short_dev $SCRATCH_DEV)
echo "Start test on device $SCRATCH_DEV, basename $DEV_BASENAME" >$seqres.full
_scratch_mkfs >>$seqres.full 2>&1
while true;do
mount $SCRATCH_DEV $SCRATCH_MNT
umount $SCRATCH_DEV
while true; do
cat /proc/fs/ext4/$DEV_BASENAME/mb_groups > /dev/null 2>&1
done &
PIDS=$!
while true;do
cat /proc/fs/ext4/$DEV_BASENAME/mb_groups > /dev/null 2>&1
done &
PIDS="$PIDS $!"
# sleep for 180s, in most cases a buggy kernel could hit BUG_ON within 3 minutes
sleep 180
# 30 loops is enough to crash a buggy kernel
i=0
while [ $i -lt 30 ]; do
mount $SCRATCH_DEV $SCRATCH_MNT
umount $SCRATCH_DEV
let i=i+1
done
# no BUG_ON, all done
kill $PIDS >/dev/null 2>&1