2 # SPDX-License-Identifier: GPL-2.0
3 # Copyright (c) 2019 Red Hat, Inc. All Rights Reserved.
7 # This test verifies that cgroup aware writeback properly accounts I/Os in
8 # various scenarios. We perform reads/writes from different combinations of
9 # cgroups and verify that pages are accounted against the group that brought
14 seqres=$RESULT_DIR/$seq
15 echo "QA output created by $seq"
19 status=1 # failure is the default!
20 trap "_cleanup; exit \$status" 0 1 2 3 15
27 echo $$ > $cgdir/cgroup.procs
28 rmdir $cgdir/$seq-cg* > /dev/null 2>&1
31 # get standard environment, filters and checks
36 # remove previous $seqres.full before test
39 # real QA test starts here
41 # Modify as appropriate.
47 # cgroup v2 writeback is only support on block devices so far
48 _require_block_device $SCRATCH_DEV
50 smajor=$((0x`stat -L -c %t $SCRATCH_DEV`))
51 sminor=$((0x`stat -L -c %T $SCRATCH_DEV`))
54 iosize=$((1024 * 1024 * 8))
56 # Check cgroup read/write charges against expected values. Allow for some
57 # tolerance as different filesystems seem to account slightly differently.
61 cgname=$(basename $cgroot)
67 iobytes=`cat $cgroot/io.stat | grep $smajor:$sminor`
69 rbytes=`echo $iobytes | awk '{ print $2 }' | \
70 awk -F = '{ print $2 }'`
71 wbytes=`echo $iobytes | awk '{ print $3 }' | \
72 awk -F = '{ print $2 }'`
75 _within_tolerance "read" $rbytes $expectedread 5% -v
76 _within_tolerance "write" $wbytes $expectedwrite 5% -v
79 # Move current process to another cgroup.
83 echo $$ > $1/cgroup.procs
86 # Reset cgroup state for a new test.
89 echo $$ > $cgdir/cgroup.procs
90 rmdir $cgdir/$seq-cg* > /dev/null 2>&1
91 $XFS_IO_PROG -fc "pwrite 0 $iosize" $SCRATCH_MNT/file \
93 _scratch_cycle_mount || _fail "mount failed"
94 stat $SCRATCH_MNT/file > /dev/null
97 _scratch_mkfs >> $seqres.full 2>&1
100 echo "+io" > $cgdir/cgroup.subtree_control || _fail "subtree control"
102 # Read and write from a single group.
105 switch_cg $cgdir/$seq-cg
106 $XFS_IO_PROG -c "pread 0 $iosize" -c "pwrite 0 $iosize" -c fsync \
107 $SCRATCH_MNT/file >> $seqres.full 2>&1
109 $XFS_IO_PROG -c fsync $SCRATCH_MNT/file
110 check_cg $cgdir/$seq-cg $iosize $iosize
112 # Write from one cgroup then read and write from a second. Writes are charged to
113 # the first group and nothing to the second.
114 echo "write -> read/write"
116 switch_cg $cgdir/$seq-cg
117 $XFS_IO_PROG -c "pwrite 0 $iosize" $SCRATCH_MNT/file >> $seqres.full 2>&1
118 switch_cg $cgdir/$seq-cg-2
119 $XFS_IO_PROG -c "pread 0 $iosize" -c "pwrite 0 $iosize" $SCRATCH_MNT/file \
122 $XFS_IO_PROG -c fsync $SCRATCH_MNT/file
123 check_cg $cgdir/$seq-cg 0 $iosize
124 check_cg $cgdir/$seq-cg-2 0 0
126 # Read from one cgroup, read & write from a second. Both reads and writes are
127 # charged to the first group and nothing to the second.
128 echo "read -> read/write"
130 switch_cg $cgdir/$seq-cg
131 $XFS_IO_PROG -c "pread 0 $iosize" $SCRATCH_MNT/file >> $seqres.full 2>&1
132 switch_cg $cgdir/$seq-cg-2
133 $XFS_IO_PROG -c "pread 0 $iosize" -c "pwrite 0 $iosize" $SCRATCH_MNT/file \
136 $XFS_IO_PROG -c fsync $SCRATCH_MNT/file
137 check_cg $cgdir/$seq-cg $iosize $iosize
138 check_cg $cgdir/$seq-cg-2 0 0
140 echo "-io" > $cgdir/cgroup.subtree_control || _fail "subtree control"