[Maybe not the best time to send patch series, but just wanted to get some early feedback from zsmalloc maintainers] The purpose of this series is to define own memory descriptor for zsmalloc, instead of re-using various fields of struct page. This is a part of the effort to reduce the size of struct page to unsigned long and enable dynamic allocation of memory descriptors. While [1] outlines this ultimate objective, the current use of struct page is highly interdependent, making it challenging to separately allocate memory descriptors. Therefore, this series introduces new descriptor for zsmalloc, called zsdesc. It overlays struct page for now, but will eventually be allocated independently in the future. And apart from dynamic allocation of descriptors, this is a nice cleanup. I have no strong opinion about its name. I was thinking about between zsmem and zsdesc, and wanted to be consistent with struct ptdesc. (which is AFAIK work in progress) This work is also available at: https://gitlab.com/hyeyoo/linux/-/tree/separate_zsdesc_rfc-v1 Any feedbacks would be appreciated! [1] State Of The Page, August 2022 https://lore.kernel.org/lkml/YvV1KTyzZ+Jrtj9x@xxxxxxxxxxxxxxxxxxxx Best regards, Hyeonggon Hyeonggon Yoo (25): mm/zsmalloc: create new struct zsdesc mm/zsmalloc: add utility functions for zsdesc mm/zsmalloc: replace first_page to first_zsdesc in struct zspage mm/zsmalloc: add alternatives of frequently used helper functions mm/zsmalloc: convert {try,}lock_zspage() to use zsdesc mm/zsmalloc: convert __zs_{map,unmap}_object() to use zsdesc mm/zsmalloc: convert obj_to_location() and its users to use zsdesc mm/zsmalloc: convert obj_malloc() to use zsdesc mm/zsmalloc: convert create_page_chain() and its users to use zsdesc mm/zsmalloc: convert obj_tagged() and related helpers to use zsdesc mm/zsmalloc: convert init_zspage() to use zsdesc mm/zsmalloc: convert obj_to_page() and zs_free() to use zsdesc mm/zsmalloc: convert reset_page() to reset_zsdesc() mm/zsmalloc: convert zs_page_{isolate,migrate,putback} to use zsdesc mm/zsmalloc: convert __free_zspage() to use zsdesc mm/zsmalloc: convert unlock_zspage() to use zsdesc mm/zsmalloc: convert location_to_obj() to use zsdesc mm/zsmalloc: convert free_handles() to use zsdesc mm/zsmalloc: convert zs_compact_control and its users to use zsdesc mm/zsmalloc: convert get_zspage() to take zsdesc mm/zsmalloc: convert SetZsPageMovable() to use zsdesc mm/zsmalloc: convert restore_freelist() to use zsdesc mm/zsmalloc: convert zs_reclaim_page() to use zsdesc mm/zsmalloc: remove now unused helper functions mm/zsmalloc: convert {get,set}_first_obj_offset() to use zsdesc mm/zsmalloc.c | 707 ++++++++++++++++++++++++++++++-------------------- 1 file changed, 429 insertions(+), 278 deletions(-) -- 2.25.1
