Re: [PATCH v2 04/33] mm: Split slab into its own type
From: Johannes Weiner <hannes@cmpxchg.org>
Date: 2021-12-14 14:25:15
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linux-patches
On Wed, Dec 01, 2021 at 07:14:41PM +0100, Vlastimil Babka wrote:
From: "Matthew Wilcox (Oracle)" <willy@infradead.org> Make struct slab independent of struct page. It still uses the underlying memory in struct page for storing slab-specific data, but slab and slub can now be weaned off using struct page directly. Some of the wrapper functions (slab_address() and slab_order()) still need to cast to struct folio, but this is a significant disentanglement. [ vbabka@suse.cz: Rebase on folios, use folio instead of page where possible. Do not duplicate flags field in struct slab, instead make the related accessors go through slab_folio(). For testing pfmemalloc use the folio_*_active flag accessors directly so the PageSlabPfmemalloc wrappers can be removed later. Make folio_slab() expect only folio_test_slab() == true folios and virt_to_slab() return NULL when folio_test_slab() == false. Move struct slab to mm/slab.h. Don't represent with struct slab pages that are not true slab pages, but just a compound page obtained directly rom page allocator (with large kmalloc() for SLUB and SLOB). ] Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org> Signed-off-by: Vlastimil Babka <redacted>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>