Repeatedly read /sys/block/zram*/mm_stat for 1 sec. This should fix bug
on ppc64le on stable kernels, where mem_used_total is often 0.
Signed-off-by: Petr Vorel <pvorel@xxxxxxx>
---
.../kernel/device-drivers/zram/zram01.sh | 27 +++++++++++++++++--
1 file changed, 25 insertions(+), 2 deletions(-)
diff --git a/testcases/kernel/device-drivers/zram/zram01.sh b/testcases/kernel/device-drivers/zram/zram01.sh
index 58d233f91..76a8ccab4 100755
--- a/testcases/kernel/device-drivers/zram/zram01.sh
+++ b/testcases/kernel/device-drivers/zram/zram01.sh
@@ -105,6 +105,26 @@ zram_mount()
tst_res TPASS "mount of zram device(s) succeeded"
}
+read_mem_used_total()
+{
+ echo $(awk '{print $3}' $1)
+}
+
+# Reads /sys/block/zram*/mm_stat until mem_used_total is not 0.
+loop_read_mem_used_total()
+{
+ local file="$1"
+ local mem_used_total
+
+ tst_res TINFO "$file"
+ cat $file >&2
+
+ mem_used_total=$(read_mem_used_total $file)
+ [ "$mem_used_total" -eq 0 ] && return 1
+
+ return 0
+}
+
zram_fill_fs()
{
local mem_used_total
@@ -133,9 +153,12 @@ zram_fill_fs()
continue
fi
- mem_used_total=`awk '{print $3}' "/sys/block/zram$i/mm_stat"`
+ TST_RETRY_FUNC "loop_read_mem_used_total /sys/block/zram$i/mm_stat" 0
+ mem_used_total=$(read_mem_used_total /sys/block/zram$i/mm_stat)
+ tst_res TINFO "mem_used_total: $mem_used_total"
+
v=$((100 * 1024 * $b / $mem_used_total))
- r=`echo "scale=2; $v / 100 " | bc`
+ r=$(echo "scale=2; $v / 100 " | bc)
if [ "$v" -lt 100 ]; then
tst_res TFAIL "compression ratio: $r:1"
--
2.38.0
