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| author | Aaron Lu <aaron.lu@intel.com> | 2016-09-21 14:35:10 +0800 |
|---|---|---|
| committer | Fengguang Wu <fengguang.wu@intel.com> | 2016-09-21 16:29:52 +0800 |
| commit | c079cd0e70adc7c99a8bdb11a22e28feab21cde7 (patch) | |
| tree | 2a02292f68b84d4006ce84793f3e78cbe19d2d9a | |
| parent | cd690069bc126d462314de487f6a56cc2e2ea0bc (diff) | |
| download | vm-scalability-c079cd0e70adc7c99a8bdb11a22e28feab21cde7.tar.gz | |
small-allocs: restrict vm_area_struct slab memory usage
For this small allocs test, a lot of vma will be allocated. Each vma
will need a vm_area_struct slab object and these objects will fill up
all memory and then OOM.
These slabs are unreclaimable.
Restrict the memory consumption by this slab to 1/3 MemTotal.
Jira-link: https://jira01.devtools.intel.com/browse/OLT-1479
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
| -rwxr-xr-x | case-small-allocs | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/case-small-allocs b/case-small-allocs index bf4b259..73e4387 100755 --- a/case-small-allocs +++ b/case-small-allocs @@ -5,4 +5,19 @@ . ./hw_vars -$USEMEM -n $nr_task --readonly --unit $((10 * pagesize)) $((ROTATE_BYTES / nr_task)) +# vm_area_struct slab could consume a hell lot of memory for this small alloc test +# let's restrict it to 1/3 MemTotal +slab_mem_max=$((mem/3)) +# vm_area_struct is 192 bytes, 1 page could host 21 vm_area_struct +# below is a line from slabinfo, where it shows 1 slab has 2 pages and 42 objects in these 2 pages. +# vm_area_struct 58264 60816 192 42 2 : tunables 0 0 0 : slabdata 1448 1448 0 +vma_nr_max=$((21*slab_mem_max/4096)) + +size=$ROTATE_BYTES +unit_size=$((10 * pagesize)) +while [ $((size/unit_size)) -gt $vma_nr_max ] +do + size=$((size>>1)) +done + +$USEMEM -n $nr_task --readonly --unit $unit_size $((size / nr_task)) |