[PATCH] generic/233,270: unlimit the max locked memory size for io_uring

Zorro Lang
2021-01-27T07:25:44Z

The ltp/fsstress always fails on io_uring_queue_init() by returnning
ENOMEM. Due to io_uring accounts memory it needs under the rlimit
memlocked option, which can be quite low on some setups, especially
on 64K pagesize machine. root isn't under this restriction, but
regular users are. So only g/233 and g/270 which use $qa_user to run
fsstress are failed.

To avoid this failure, set max locked memory to unlimited before doing
fsstress, then restore it after test done.

Signed-off-by: Zorro Lang <zlang@redhat.com>
---
tests/generic/233 | 8 ++++++++
tests/generic/270 | 8 ++++++++
2 files changed, 16 insertions(+)

diff --git a/tests/generic/233 b/tests/generic/233
index 7eda5774..342690c2 100755
--- a/tests/generic/233
+++ b/tests/generic/233
@@ -43,6 +43,13 @@ _fsstress()
-f rename=10 -f fsync=2 -f write=15 -f dwrite=15 \
-n $count -d $out -p 7`

+ # io_uring accounts memory it needs under the rlimit memlocked option,
+ # which can be quite low on some setups (especially 64K pagesize). root
+ # isn't under this restriction, but regular users are. To avoid the
+ # io_uring_queue_init fail on ENOMEM, set max locked memory to unlimited
+ # temporarily.
+ lmem=`ulimit -l`
+ ulimit -l unlimited
echo "fsstress $args" >> $seqres.full
if ! su $qa_user -c "$FSSTRESS_PROG $args" | tee -a $seqres.full | _filter_num
then
@@ -50,6 +57,7 @@ _fsstress()
cat $tmp.out | tee -a $seqres.full
status=1
fi
+ ulimit -l $lmem
}

# real QA test starts here
diff --git a/tests/generic/270 b/tests/generic/270
index 3d8656d4..bd52d56e 100755
--- a/tests/generic/270
+++ b/tests/generic/270
@@ -37,6 +37,13 @@ _workout()
cp $FSSTRESS_PROG $tmp.fsstress.bin
$SETCAP_PROG cap_chown=epi $tmp.fsstress.bin

+ # io_uring accounts memory it needs under the rlimit memlocked option,
+ # which can be quite low on some setups (especially 64K pagesize). root
+ # isn't under this restriction, but regular users are. To avoid the
+ # io_uring_queue_init fail on ENOMEM, set max locked memory to unlimited
+ # temporarily.
+ lmem=`ulimit -l`
+ ulimit -l unlimited
(su $qa_user -c "$tmp.fsstress.bin $args" &) > /dev/null 2>&1

echo "Run dd writers in parallel"
@@ -50,6 +57,7 @@ _workout()
done

$KILLALL_PROG -w $tmp.fsstress.bin
+ ulimit -l $lmem
}

# real QA test starts here
--
2.29.2