P5 Description
The code in `ZHeuristics::use_per_cpu_shared_small_pages` doesn't match its comment.
```
bool ZHeuristics::use_per_cpu_shared_small_pages() {
// Use per-CPU shared small pages only if these pages occupy at most 3.125%
// of the max heap size. Otherwise fall back to using a single shared small
// page. This is useful when using small heaps on large machines.
const size_t per_cpu_share = significant_heap_overhead() / ZCPU::count();
return per_cpu_share >= ZPageSizeSmall;
}
```
From Kim's description, I revise the title.
> The proposed change just reverts what appears to have been an intentional code
change inJDK-8307058. That change should have updated the comment. So I
don't think this change should be made. The comment should be fixed instead.
```
bool ZHeuristics::use_per_cpu_shared_small_pages() {
// Use per-CPU shared small pages only if these pages occupy at most 3.125%
// of the max heap size. Otherwise fall back to using a single shared small
// page. This is useful when using small heaps on large machines.
const size_t per_cpu_share = significant_heap_overhead() / ZCPU::count();
return per_cpu_share >= ZPageSizeSmall;
}
```
From Kim's description, I revise the title.
> The proposed change just reverts what appears to have been an intentional code
change in
don't think this change should be made. The comment should be fixed instead.
