From 17d70b52f5dac5a9f18ca5ab990f8f3c1a0a3f96 Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Tue, 12 Feb 2019 10:22:03 -0500 Subject: [PATCH] shared: cgroup aware writeback accounting test A test to perform reads/writes under various cgroups and verify that I/Os are accounted properly according to cgroup aware writeback. This is a generic test, but not all commonly used local filesystems support cgroup aware writeback at the moment (i.e., XFS). Therefore, this test currently requires ext4 or btrfs for the time being. The common/cgroup2 file is copied from a separate cgroup related patch from Shaohua Li that never made it upstream. Signed-off-by: Brian Foster Signed-off-by: Shaohua Li Reviewed-by: Eryu Guan Signed-off-by: Eryu Guan --- common/cgroup2 | 15 +++++ tests/shared/011 | 141 +++++++++++++++++++++++++++++++++++++++++++ tests/shared/011.out | 14 +++++ tests/shared/group | 1 + 4 files changed, 171 insertions(+) create mode 100644 common/cgroup2 create mode 100755 tests/shared/011 create mode 100644 tests/shared/011.out diff --git a/common/cgroup2 b/common/cgroup2 new file mode 100644 index 00000000..f89825e2 --- /dev/null +++ b/common/cgroup2 @@ -0,0 +1,15 @@ +# cgroup2 specific common functions + +export CGROUP2_PATH="${CGROUP2_PATH:-/sys/fs/cgroup}" + +_require_cgroup2() +{ + if [ ! -f "${CGROUP2_PATH}/cgroup.subtree_control" ]; then + _notrun "Test requires cgroup2 enabled" + fi + if [[ ! $(cat ${CGROUP2_PATH}/cgroup.controllers) =~ $1 ]]; then + _notrun "Cgroup2 doesn't support $1 controller $1" + fi +} + +/bin/true diff --git a/tests/shared/011 b/tests/shared/011 new file mode 100755 index 00000000..a0ac375d --- /dev/null +++ b/tests/shared/011 @@ -0,0 +1,141 @@ +#! /bin/bash +# SPDX-License-Identifier: GPL-2.0 +# Copyright (c) 2019 Red Hat, Inc. All Rights Reserved. +# +# FS QA Test No. 011 +# +# 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 +} + +# get standard environment, filters and checks +. ./common/rc +. ./common/filter +. ./common/cgroup2 + +# remove previous $seqres.full before test +rm -f $seqres.full + +# real QA test starts here + +# Modify as appropriate. +_supported_fs ext4 btrfs +_supported_os Linux +_require_scratch +_require_cgroup2 io + +smajor=$((0x`stat -L -c %t $SCRATCH_DEV`)) +sminor=$((0x`stat -L -c %T $SCRATCH_DEV`)) +cgdir=$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 + _scratch_cycle_mount || _fail "mount failed" + stat $SCRATCH_MNT/file > /dev/null +} + +_scratch_mkfs >> $seqres.full 2>&1 +_scratch_mount + +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 + +echo "-io" > $cgdir/cgroup.subtree_control || _fail "subtree control" + +# success, all done +status=0 +exit diff --git a/tests/shared/011.out b/tests/shared/011.out new file mode 100644 index 00000000..277f4bcb --- /dev/null +++ b/tests/shared/011.out @@ -0,0 +1,14 @@ +QA output created by 011 +read/write +read is in range +write is in range +write -> read/write +read is in range +write is in range +read is in range +write is in range +read -> read/write +read is in range +write is in range +read is in range +write is in range diff --git a/tests/shared/group b/tests/shared/group index bc33f18f..b091d911 100644 --- a/tests/shared/group +++ b/tests/shared/group @@ -13,6 +13,7 @@ 008 auto stress dedupe 009 auto stress dedupe 010 auto stress dedupe +011 auto quick 032 mkfs auto quick 272 auto enospc rw 289 auto quick -- 2.39.5