[LTP] [PATCH v2] cpuset_memory_spread: set lowerlimit according to pagesize

[Hongchen Zhang]

When I test the cpuset_memory_spread case,this case FAIL too often.
After dig into the code, I find out that the fowlloing things trigger
the FAIL:
1) random events,the probability is very small and can be ignored
2) get_meminfo which before send signal to test_pid
3) account_memsinfo before result_check

About 2) and 3), we can increase the value of lowerlimit to keep
the result as SUCCESS.

After discussing with Richard, we all agree to use the following
formula to calculate the lowerlimit:
lowerlimit(kb) = pagesize(byte) * 512 / 1024

Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
---
 .../cpuset_memory_spread_testset.sh                    | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/testcases/kernel/controllers/cpuset/cpuset_memory_spread_test/cpuset_memory_spread_testset.sh b/testcases/kernel/controllers/cpuset/cpuset_memory_spread_test/cpuset_memory_spread_testset.sh
index e2767ef05..f7230a4ea 100755
--- a/testcases/kernel/controllers/cpuset/cpuset_memory_spread_test/cpuset_memory_spread_testset.sh
+++ b/testcases/kernel/controllers/cpuset/cpuset_memory_spread_test/cpuset_memory_spread_testset.sh
@@ -38,7 +38,15 @@ nr_mems=$N_NODES
 # on which it is running. The other nodes' slab space has littler change.(less
 # than 1000 kb).
 upperlimit=10000
-lowerlimit=2000
+
+# set lowerlimit according to pagesize
+# pagesize(bytes)  | lowerlimit(kb)
+# ------------------------------------
+#  4096            | 2048
+#  16384           | 8192
+
+PAGE_SIZE=`tst_getconf PAGESIZE`
+lowerlimit=$((PAGE_SIZE * 512 / 1024))
 
 cpus_all="$(seq -s, 0 $((nr_cpus-1)))"
 mems_all="$(seq -s, 0 $((nr_mems-1)))"

base-commit: 020f3985a5ca86c8bbece27eef8fb0315a10463e
-- 
2.33.0