Re: [PATCHv2 0/3] zsmalloc: small compaction improvements

[Sergey Senozhatsky]

On (23/06/24 14:12), Sergey Senozhatsky wrote:
> Hi,
> 	A tiny series that can reduce the number of
> find_alloced_obj() invocations (which perform a linear
> scan of sub-page) during compaction. Inspired by Alexey
> Romanov's findings.
> 
> v2:
> -- picked up a patch from Minchan
> 
> Minchan Kim (1):
>   zsmalloc: remove zs_compact_control
> 
> Sergey Senozhatsky (2):
>   zsmalloc: do not scan for allocated objects in empty zspage
>   zsmalloc: move migration destination zspage inuse check

Just for the record,

A synthetic zsmalloc fragmentation+compaction test (100% reproducible)

           num find_tagged_obj() calls     num iterations in find_tagged_obj()

base                 545699                              812899
patch #1             460701                              691821
patch #2             422372                              651372

// lower is better


patch #1 is "zsmalloc: do not scan for allocated objects in empty zspage"
patch #2 is "zsmalloc: move migration destination zspage inuse check"