From: Matthew Wilcox <mawilcox@xxxxxxxxxxxxx> This is actually the combination of two previously posted series. Since they both deal with rearranging struct page and the second series depends on the first, I thought it best to combine them. The overall motivation is to make it easier for people to use the space in struct page if they've allocated it for their own purposes. By the end of the series, we end up with five consecutive words which can be used almost arbitrarily by the owner. Highlights: - slub's counters no longer share space with _refcount. - slub's freelist+counters are now naturally dword aligned. - It's now more obvious what fields in struct page are used by which owners (some owners still take advantage of the union aliasing). - deferred_list now really exists in struct page instead of just a comment. - slub loses a parameter to a lot of functions. Matthew Wilcox (14): s390: Use _refcount for pgtables mm: Split page_type out from _mapcount mm: Mark pages in use for page tables mm: Switch s_mem and slab_cache in struct page mm: Move 'private' union within struct page mm: Move _refcount out of struct page union slub: Remove page->counters mm: Combine first three unions in struct page mm: Use page->deferred_list mm: Move lru union within struct page mm: Combine first two unions in struct page mm: Improve struct page documentation slab,slub: Remove rcu_head size checks slub: Remove kmem_slab_cache->reserved arch/s390/mm/pgalloc.c | 21 +-- fs/proc/page.c | 2 + include/linux/mm.h | 2 + include/linux/mm_types.h | 216 +++++++++++-------------- include/linux/page-flags.h | 51 +++--- include/linux/slub_def.h | 1 - include/uapi/linux/kernel-page-flags.h | 2 +- kernel/crash_core.c | 1 + mm/huge_memory.c | 7 +- mm/page_alloc.c | 17 +- mm/slab.c | 2 - mm/slub.c | 137 +++++++--------- scripts/tags.sh | 6 +- tools/vm/page-types.c | 1 + 14 files changed, 215 insertions(+), 251 deletions(-) -- 2.17.0
