blob: fe7394c0910ce1dad507e4d1a6f1244ac694e2fd [file] [log] [blame]
#! /bin/bash
# SPDX-License-Identifier: GPL-2.0
# Copyright (c) 2019 Red Hat, Inc. All Rights Reserved.
#
# FS QA Test No. 563
#
# This test verifies that cgroup aware writeback properly accounts I/Os in
# various scenarios. We perform reads/writes from different combinations of
# cgroups and verify that pages are accounted against the group that brought
# them into cache.
#
seq=`basename $0`
seqres=$RESULT_DIR/$seq
echo "QA output created by $seq"
here=`pwd`
tmp=/tmp/$$
status=1 # failure is the default!
trap "_cleanup; exit \$status" 0 1 2 3 15
_cleanup()
{
cd /
rm -f $tmp.*
echo $$ > $cgdir/cgroup.procs
rmdir $cgdir/$seq-cg* > /dev/null 2>&1
umount $SCRATCH_MNT > /dev/null 2>&1
_destroy_loop_device $LOOP_DEV > /dev/null 2>&1
}
# get standard environment, filters and checks
. ./common/rc
. ./common/filter
. ./common/cgroup2
# remove previous $seqres.full before test
rm -f $seqres.full
# real QA test starts here
# Modify as appropriate.
_supported_fs generic
_require_scratch_nocheck
_require_cgroup2 io
_require_loop
# cgroup v2 writeback is only support on block devices so far
_require_block_device $SCRATCH_DEV
cgdir=$CGROUP2_PATH
iosize=$((1024 * 1024 * 8))
# Check cgroup read/write charges against expected values. Allow for some
# tolerance as different filesystems seem to account slightly differently.
check_cg()
{
cgroot=$1
cgname=$(basename $cgroot)
expectedread=$2
expectedwrite=$3
rbytes=0
wbytes=0
iobytes=`cat $cgroot/io.stat | grep $smajor:$sminor`
if [ $? == 0 ]; then
rbytes=`echo $iobytes | awk '{ print $2 }' | \
awk -F = '{ print $2 }'`
wbytes=`echo $iobytes | awk '{ print $3 }' | \
awk -F = '{ print $2 }'`
fi
_within_tolerance "read" $rbytes $expectedread 5% -v
_within_tolerance "write" $wbytes $expectedwrite 5% -v
}
# Move current process to another cgroup.
switch_cg()
{
mkdir -p $1
echo $$ > $1/cgroup.procs
}
# Reset cgroup state for a new test.
reset()
{
echo $$ > $cgdir/cgroup.procs
rmdir $cgdir/$seq-cg* > /dev/null 2>&1
$XFS_IO_PROG -fc "pwrite 0 $iosize" $SCRATCH_MNT/file \
>> $seqres.full 2>&1
umount $SCRATCH_MNT || _fail "umount failed"
_mount $LOOP_DEV $SCRATCH_MNT || _fail "mount failed"
stat $SCRATCH_MNT/file > /dev/null
}
# cgroup I/O accounting doesn't work on partitions. Use a loop device to rule
# that out.
LOOP_DEV=$(_create_loop_device $SCRATCH_DEV)
smajor=$((0x`stat -L -c %t $LOOP_DEV`))
sminor=$((0x`stat -L -c %T $LOOP_DEV`))
_mkfs_dev $LOOP_DEV >> $seqres.full 2>&1
_mount $LOOP_DEV $SCRATCH_MNT || _fail "mount failed"
drop_io_cgroup=
grep -q -w io $cgdir/cgroup.subtree_control || drop_io_cgroup=1
echo "+io" > $cgdir/cgroup.subtree_control || _fail "subtree control"
# Read and write from a single group.
echo "read/write"
reset
switch_cg $cgdir/$seq-cg
$XFS_IO_PROG -c "pread 0 $iosize" -c "pwrite 0 $iosize" -c fsync \
$SCRATCH_MNT/file >> $seqres.full 2>&1
switch_cg $cgdir
$XFS_IO_PROG -c fsync $SCRATCH_MNT/file
check_cg $cgdir/$seq-cg $iosize $iosize
# Write from one cgroup then read and write from a second. Writes are charged to
# the first group and nothing to the second.
echo "write -> read/write"
reset
switch_cg $cgdir/$seq-cg
$XFS_IO_PROG -c "pwrite 0 $iosize" $SCRATCH_MNT/file >> $seqres.full 2>&1
switch_cg $cgdir/$seq-cg-2
$XFS_IO_PROG -c "pread 0 $iosize" -c "pwrite 0 $iosize" $SCRATCH_MNT/file \
>> $seqres.full 2>&1
switch_cg $cgdir
$XFS_IO_PROG -c fsync $SCRATCH_MNT/file
check_cg $cgdir/$seq-cg 0 $iosize
check_cg $cgdir/$seq-cg-2 0 0
# Read from one cgroup, read & write from a second. Both reads and writes are
# charged to the first group and nothing to the second.
echo "read -> read/write"
reset
switch_cg $cgdir/$seq-cg
$XFS_IO_PROG -c "pread 0 $iosize" $SCRATCH_MNT/file >> $seqres.full 2>&1
switch_cg $cgdir/$seq-cg-2
$XFS_IO_PROG -c "pread 0 $iosize" -c "pwrite 0 $iosize" $SCRATCH_MNT/file \
>> $seqres.full 2>&1
switch_cg $cgdir
$XFS_IO_PROG -c fsync $SCRATCH_MNT/file
check_cg $cgdir/$seq-cg $iosize $iosize
check_cg $cgdir/$seq-cg-2 0 0
if [ "$drop_io_cgroup" = 1 ]; then
echo "-io" > $cgdir/cgroup.subtree_control || _fail "subtree control"
fi
# success, all done
status=0
exit