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Message-ID: <8d128229-4b4d-44f8-b075-8cb1834636e0@gmail.com> Date: Fri, 28 Jun 2024 15:30:45 +0800 From: Alex Shi <seakeel@...il.com> To: alexs@...nel.org, Vitaly Wool <vitaly.wool@...sulko.com>, Miaohe Lin <linmiaohe@...wei.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, minchan@...nel.org, willy@...radead.org, senozhatsky@...omium.org, david@...hat.com, 42.hyeyoo@...il.com Subject: Re: [PATCH 00/20] mm/zsmalloc: add zpdesc memory descriptor for zswap.zpool On 6/28/24 3:26 PM, Alex Shi wrote: > > On 6/28/24 11:11 AM, alexs@...nel.org wrote: >> From: Alex Shi <alexs@...nel.org> >> >> According to Metthew's plan, the page descriptor will be replace by a 8 >> bytes mem_desc on destination purpose. >> https://lore.kernel.org/lkml/YvV1KTyzZ+Jrtj9x@casper.infradead.org/ >> >> Here is a implement on zsmalloc to replace page descriptor by 'zpdesc', >> which is still overlay on struct page now. but it's a step move forward >> above destination. >> >> To name the struct zpdesc instead of zsdesc, since there are still 3 >> zpools under zswap: zbud, z3fold, zsmalloc for now(z3fold maybe removed >> soon), and we could easyly extend it to other zswap.zpool in needs. >> >> For all zswap.zpools, they are all using single page since often used >> under memory pressure. So the conversion via folio series helper is >> better than page's for compound_head check saving. >> >> For now, all zpools are using some page struct members, like page.flags >> for PG_private/PG_locked. and list_head lru, page.mapping for page migration. >> >> This patachset could save 123Kbyetes zsmalloc.o size. > > This patchset is based on next/mm-unstable. Sorry, just double checked, this patchset based on git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm mm-unstable branch. "4b17ce353e02 mm: optimization on page allocation when CMA enabled" Thanks Alex > >> >> Thanks >> Alex >> >> Alex Shi (8): >> mm/zsmalloc: add zpdesc memory descriptor for zswap.zpool >> mm/zsmalloc: use zpdesc in trylock_zspage/lock_zspage >> mm/zsmalloc: convert create_page_chain() and its users to use zpdesc >> mm/zsmalloc: rename reset_page to reset_zpdesc and use zpdesc in it >> mm/zsmalloc: convert SetZsPageMovable and remove unused funcs >> mm/zsmalloc: introduce __zpdesc_clear_movable >> mm/zsmalloc: introduce __zpdesc_clear_zsmalloc >> mm/zsmalloc: introduce __zpdesc_set_zsmalloc() >> >> Hyeonggon Yoo (12): >> mm/zsmalloc: convert __zs_map_object/__zs_unmap_object to use zpdesc >> mm/zsmalloc: add and use pfn/zpdesc seeking funcs >> mm/zsmalloc: convert obj_malloc() to use zpdesc >> mm/zsmalloc: convert obj_allocated() and related helpers to use zpdesc >> mm/zsmalloc: convert init_zspage() to use zpdesc >> mm/zsmalloc: convert obj_to_page() and zs_free() to use zpdesc >> mm/zsmalloc: add zpdesc_is_isolated/zpdesc_zone helper for >> zs_page_migrate >> mm/zsmalloc: convert __free_zspage() to use zdsesc >> mm/zsmalloc: convert location_to_obj() to take zpdesc >> mm/zsmalloc: convert migrate_zspage() to use zpdesc >> mm/zsmalloc: convert get_zspage() to take zpdesc >> mm/zsmalloc: convert get/set_first_obj_offset() to take zpdesc >> >> mm/zpdesc.h | 134 +++++++++++++++ >> mm/zsmalloc.c | 454 +++++++++++++++++++++++++++----------------------- >> 2 files changed, 384 insertions(+), 204 deletions(-) >> create mode 100644 mm/zpdesc.h >>
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