From: Shaohua Li <shli@xxxxxx>
If filesystem supports cgroup2 writeback, the writeback IO should belong
to the cgroup which writes the file. To verify this, we set a write
bandwidth limit for a cgroup using block-throttling, the writeback IO
should be throttled according to the write bandwidth.
Thanks Dave Chinner's idea to use syncfs to wait for writeback
completion.
Signed-off-by: Shaohua Li <shli@xxxxxx>
---
common/cgroup2 | 18 +++++++++++++
tests/generic/463 | 75 +++++++++++++++++++++++++++++++++++++++++++++++++++
tests/generic/463.out | 3 +++
tests/generic/group | 1 +
4 files changed, 97 insertions(+)
create mode 100644 common/cgroup2
create mode 100755 tests/generic/463
create mode 100644 tests/generic/463.out
diff --git a/common/cgroup2 b/common/cgroup2
new file mode 100644
index 00000000..bf935fee
--- /dev/null
+++ b/common/cgroup2
@@ -0,0 +1,18 @@
+#!/bin/bash
+# cgroup2 specific common functions
+
+export CGROUP2_PATH="/sys/fs/cgroup"
+
+_require_cgroup2()
+{
+ if [ ! -f ${CGROUP2_PATH}/cgroup.subtree_control ]; then
+ _notrun "Test requires cgroup2 enabled"
+ fi
+}
+
+_get_scratch_dev_devt()
+{
+ ls -l $SCRATCH_DEV | awk '{printf("%s:%s", substr($5, 1, length($5)-1), 0)}'
+}
+
+/bin/true
diff --git a/tests/generic/463 b/tests/generic/463
new file mode 100755
index 00000000..620a14a4
--- /dev/null
+++ b/tests/generic/463
@@ -0,0 +1,75 @@
+#! /bin/bash
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/filter
+. ./common/cgroup2
+
+status=1 # failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+cgname=`mktemp -du ${CGROUP2_PATH}/test.XXXXXX`
+_cleanup()
+{
+ cd /
+ _scratch_unmount
+ sync
+ rmdir $cgname
+}
+
+# real QA test starts here
+
+# Modify as appropriate.
+_supported_fs generic
+_supported_os Linux
+_require_scratch
+_require_cgroup2
+
+# Setup Filesystem
+_scratch_mkfs >/dev/null 2>&1 || _fail "mkfs failed"
+
+_scratch_mount || _fail "mount failed"
+
+test_speed()
+{
+ start=$(date +%s)
+ $XFS_IO_PROG -f -d -c "pwrite -b 1m 0 500m" "$SCRATCH_MNT/image" \
+ > /dev/null 2>&1
+ echo $(($(date +%s) - $start))
+}
+time=$(test_speed)
+
+if [ $time -gt 25 ]; then
+ echo "Disk is too slow, make sure disk can do 20MB/s at least"
+ status=1
+ exit 1
+fi
+
+echo "Disk speed is ok, start throttled writeback test"
+
+echo +io > ${CGROUP2_PATH}/cgroup.subtree_control
+mkdir $cgname
+echo "$(_get_scratch_dev_devt) wbps=$((5*1024*1024))" > $cgname/io.max
+
+run_writeback()
+{
+ start=$(date +%s)
+ $XFS_IO_PROG -f -c "pwrite 0 500m" -c "syncfs" "$SCRATCH_MNT/image" \
+ > /dev/null 2>&1
+ echo $(($(date +%s) - $start))
+}
+time=$(
+echo $BASHPID > $cgname/cgroup.procs;
+run_writeback
+)
+_within_tolerance "Throttled writeback runtime" $time 100 10% -v
+
+# success, all done
+status=0
+exit
diff --git a/tests/generic/463.out b/tests/generic/463.out
new file mode 100644
index 00000000..c69f87c2
--- /dev/null
+++ b/tests/generic/463.out
@@ -0,0 +1,3 @@
+QA output created by 463
+Disk speed is ok, start throttled writeback test
+Throttled writeback runtime is in range
diff --git a/tests/generic/group b/tests/generic/group
index f2a6cdad..ea7b6956 100644
--- a/tests/generic/group
+++ b/tests/generic/group
@@ -465,3 +465,4 @@
460 auto quick rw
461 auto shutdown stress
462 auto quick dax
+463 cgroup writeback test
--
2.11.0
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