On (03/14/16 16:41), Sergey Senozhatsky wrote:
[..]
> you mean that __zs_compact() instead of just checking per-class
> zs_can_compact() should check global pool ratio and bail out if
> compaction of class Z has dropped the overall fragmentation ratio
> below some watermark?
>
> my logic was that
> -- suppose we have class A with fragmentation ratio 49% and class B
> with 8% of wasted pages, so the overall pool fragmentation is
> (50 + 10)/ 2 < 30%, while we still have almost 50% fragmented class.
"(49 + 8) / 2 < 30%"
-ss
