Re: [PATCH v7 00/21] mm/zsmalloc: add zpdesc memory descriptor for zswap.zpool
From: Sergey Senozhatsky
Date: Mon Sep 02 2024 - 23:45:55 EST
On (24/09/03 12:35), Sergey Senozhatsky wrote:
> On (24/09/02 15:21), alexs@xxxxxxxxxx wrote:
> > The descriptor still overlays the struct page; nothing has changed
> > in that regard.
> > [..]
> > This patachset does not increase the descriptor size nor introduce any
> > functional changes, and could save about 122Kbytes zsmalloc.o size.
>
> Is this number accurate? Where does such a large saving come from?
./scripts/bloat-o-meter mm/zsmalloc.o-base mm/zsmalloc.o-patched
add/remove: 0/0 grow/shrink: 2/6 up/down: 7/-843 (-836)
Function old new delta
obj_free 211 215 +4
zs_unmap_object 568 571 +3
zs_map_object 661 633 -28
SetZsPageMovable 135 86 -49
free_zspage 310 253 -57
__free_zspage 284 226 -58
zs_page_migrate 1304 1136 -168
async_free_zspage 1099 616 -483