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2025-01-25mm/zsmalloc: introduce __zpdesc_clear/set_zsmalloc()Alex Shi
Add helper __zpdesc_clear_zsmalloc() for __ClearPageZsmalloc(), __zpdesc_set_zsmalloc() for __SetPageZsmalloc(), and use them in callers. [42.hyeyoo@gmail.com: keep reset_zpdesc() to use struct page] Link: https://lkml.kernel.org/r/20241216150450.1228021-19-42.hyeyoo@gmail.com Signed-off-by: Alex Shi <alexs@kernel.org> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25mm/zsmalloc: convert __free_zspage() to use zpdescHyeonggon Yoo
Introduce zpdesc_is_locked() and convert __free_zspage() to use zpdesc. Link: https://lkml.kernel.org/r/20241216150450.1228021-13-42.hyeyoo@gmail.com Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Alex Shi <alexs@kernel.org> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25mm/zsmalloc: add two helpers for zs_page_migrate() and make it use zpdescHyeonggon Yoo
To convert page to zpdesc in zs_page_migrate(), we added zpdesc_is_isolated()/zpdesc_zone() helpers. No functional change. Link: https://lkml.kernel.org/r/20241216150450.1228021-11-42.hyeyoo@gmail.com Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Alex Shi <alexs@kernel.org> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25mm/zsmalloc: convert create_page_chain() and its users to use zpdescAlex Shi
Introduce a few helper functions for conversion to convert create_page_chain() to use zpdesc, then use zpdesc in replace_sub_page(). Link: https://lkml.kernel.org/r/20241216150450.1228021-7-42.hyeyoo@gmail.com Originally-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Alex Shi <alexs@kernel.org> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25mm/zsmalloc: add and use pfn/zpdesc seeking funcsHyeonggon Yoo
Add pfn_zpdesc(), pfn_zpdesc() and kmap_local_zpdesc(). Convert obj_to_location() to take zpdesc and also convert its users to use zpdesc. Link: https://lkml.kernel.org/r/20241216150450.1228021-5-42.hyeyoo@gmail.com Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Alex Shi <alexs@kernel.org> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25mm/zsmalloc: use zpdesc in trylock_zspage()/lock_zspage()Alex Shi
Convert trylock_zspage() and lock_zspage() to use zpdesc. To achieve that, introduce a couple of helper functions: - zpdesc_lock() - zpdesc_unlock() - zpdesc_trylock() - zpdesc_wait_locked() - zpdesc_get() - zpdesc_put() Here we use the folio version of functions for 2 reasons. First, zswap.zpool currently only uses order-0 pages and using folio could save some compound_head checks. Second, folio_put could bypass devmap checking that we don't need. BTW, thanks Intel LKP found a build warning on the patch. Originally-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Link: https://lkml.kernel.org/r/20241216150450.1228021-3-42.hyeyoo@gmail.com Signed-off-by: Alex Shi <alexs@kernel.org> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2025-01-25mm/zsmalloc: add zpdesc memory descriptor for zswap.zpoolAlex Shi
Patch series "Add zpdesc memory descriptor for zswap.zpool", v9. This patch series introduces a new memory descriptor for zswap.zpool that currently overlaps with struct page for now. This is part of the effort to reduce the size of struct page and to enable dynamic allocation of memory descriptors [1]. This series does not bloat anything for zsmalloc and no functional change is intended (except for using zpdesc and folios). In the near future, the removal of page->index from struct page [2] will be addressed and the project also depends on this patch series. Thanks to everyone got involved in this series, especially, Alex who's been pushing it forward this year. [1] https://lore.kernel.org/linux-mm/ZvRKzKizOfEWBtJp@casper.infradead.org [2] https://lore.kernel.org/linux-mm/Z09hOy-UY9KC8WMb@casper.infradead.org This patch (of 18): The 1st patch introduces new memory descriptor zpdesc and renames zspage.first_page to zspage.first_zpdesc, with no functional change. We removed the comment about PG_owner_priv_1 since it is no longer used after commit a41ec880aa7b ("zsmalloc: move huge compressed obj from page to zspage"). [rdunlap@infradead.org: fix function parameter kernel-doc notation] Link: https://lkml.kernel.org/r/20250111063305.911010-1-rdunlap@infradead.org [42.hyeyoo@gmail.com: rework comments a little bit] Link: https://lkml.kernel.org/r/20241216150450.1228021-1-42.hyeyoo@gmail.com Link: https://lkml.kernel.org/r/20241216150450.1228021-2-42.hyeyoo@gmail.com Originally-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Alex Shi <alexs@kernel.org> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Acked-by: Sergey Senozhatsky <senozhatsky@chromium.org> Tested-by: Sergey Senozhatsky <senozhatsky@chromium.org> Cc: Alex Shi <alexs@kernel.org> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Vishal Moola (Oracle) <vishal.moola@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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