I want to add some extended statistic gathering for xfstests, but it's
tricky to isolate xfstests from the rest of the host applications. The
most straightforward way to do this is to run every test inside of it's
own cgroup. From there we can monitor the activity of tasks in the
specific cgroup using BPF.
The support for this is pretty simple, allow users to pass -C <cgroup
name>. We will create the path if it doesn't already exist, and
validate we can add things to cgroup.procs. If we cannot it'll be
disabled, otherwise we will use this when we do _run_seq by echo'ing the
bash pid into cgroup.procs, which will cause any children to run under
that cgroup.
Signed-off-by: Josef Bacik <josef@xxxxxxxxxxxxxx>
---
v1->v2:
- Changed it from a local.config option to a command line option.
- Export CGROUP2_PATH for everything, utilize that path when generating our
cgroup for the scripts to run in.
check | 24 +++++++++++++++++++++++-
common/cgroup2 | 2 --
common/config | 1 +
3 files changed, 24 insertions(+), 3 deletions(-)
diff --git a/check b/check
index 2e148e57..df33628e 100755
--- a/check
+++ b/check
@@ -72,6 +72,7 @@ check options
--large-fs optimise scratch device for large filesystems
-s section run only specified section from config file
-S section exclude the specified section from the config file
+ -C cgroup_name run all the tests in the specified cgroup name
testlist options
-g group[,group...] include tests from these groups
@@ -101,6 +102,10 @@ excluded from the list of tests to run from that test dir.
external_file argument is a path to a single file containing a list of tests
to exclude in the form of <test dir>/<test name>.
+cgroup_name is just a plain name, or a path relative to the root cgroup path.
+If CGROUP2_PATH does not point at where cgroup2 is mounted then adjust it
+accordingly.
+
examples:
check xfs/001
check -g quick
@@ -307,6 +312,7 @@ while [ $# -gt 0 ]; do
;;
--large-fs) export LARGE_SCRATCH_DEV=yes ;;
--extra-space=*) export SCRATCH_DEV_EMPTY_SPACE=${r#*=} ;;
+ -C) CGROUP=$2 ; shift ;;
-*) usage ;;
*) # not an argument, we've got tests now.
@@ -509,11 +515,24 @@ _expunge_test()
OOM_SCORE_ADJ="/proc/self/oom_score_adj"
test -w ${OOM_SCORE_ADJ} && echo -1000 > ${OOM_SCORE_ADJ}
+# Initialize the cgroup path if it doesn't already exist
+if [ ! -z "$CGROUP" ]; then
+ CGROUP=${CGROUP2_PATH}/${CGROUP}
+ mkdir -p ${CGROUP}
+
+ # If we can't write to cgroup.procs then unset cgroup
+ test -w ${CGROUP}/cgroup.procs || unset CGROUP
+fi
+
