The patch titled SLUB: change default alignments has been added to the -mm tree. Its filename is slub-change-default-alignments.patch *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find out what to do about this ------------------------------------------------------ Subject: SLUB: change default alignments From: Christoph Lameter <clameter@xxxxxxx> Structures may contain u64 items on 32 bit platforms that are only able to address 64 bit items on 64 bit boundaries. Change the mininum alignment of slabs to conform to those expectations. ARCH_KMALLOC_MINALIGN must be changed for good since a variety of structure are mixed in the general slabs. ARCH_SLAB_MINALIGN is changed because currently there is no consistent specification of object alignment. We may have that in the future when the KMEM_CACHE and related macros are used to generate slabs. These pass the alignment of the structure generated by the compiler to the slab. With KMEM_CACHE etc we could align structures that do not contain 64 bit values to 32 bit boundaries potentially saving some memory. Signed-off-by: Christoph Lameter <clameter@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/slub.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff -puN mm/slub.c~slub-change-default-alignments mm/slub.c --- a/mm/slub.c~slub-change-default-alignments +++ a/mm/slub.c @@ -145,11 +145,11 @@ SLAB_CACHE_DMA) #ifndef ARCH_KMALLOC_MINALIGN -#define ARCH_KMALLOC_MINALIGN sizeof(void *) +#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long) #endif #ifndef ARCH_SLAB_MINALIGN -#define ARCH_SLAB_MINALIGN sizeof(void *) +#define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) #endif /* Internal SLUB flags */ _ Patches currently in -mm which might be from clameter@xxxxxxx are origin.patch slab-introduce-krealloc.patch add-apply_to_page_range-which-applies-a-function-to-a-pte-range.patch safer-nr_node_ids-and-nr_node_ids-determination-and-initial.patch use-zvc-counters-to-establish-exact-size-of-dirtyable-pages.patch slab-ensure-cache_alloc_refill-terminates.patch smaps-extract-pmd-walker-from-smaps-code.patch smaps-add-pages-referenced-count-to-smaps.patch smaps-add-clear_refs-file-to-clear-reference.patch slab-use-num_possible_cpus-in-enable_cpucache.patch i386-use-page-allocator-to-allocate-thread_info-structure.patch slub-core.patch slub-change-default-alignments.patch powerpc-disable-slub-for-configurations-in-which-slab-page-structs-are-modified.patch make-page-private-usable-in-compound-pages-v1.patch optimize-compound_head-by-avoiding-a-shared-page.patch add-virt_to_head_page-and-consolidate-code-in-slab-and-slub.patch slub-fix-object-tracking.patch slub-enable-tracking-of-full-slabs.patch slub-validation-of-slabs-metadata-and-guard-zones.patch slub-add-min_partial.patch slub-add-ability-to-list-alloc--free-callers-per-slab.patch slub-free-slabs-and-sort-partial-slab-lists-in-kmem_cache_shrink.patch slub-remove-object-activities-out-of-checking-functions.patch slub-user-documentation.patch slub-add-slabinfo-tool.patch quicklists-for-page-table-pages.patch quicklist-support-for-sparc64.patch slab-allocators-remove-obsolete-slab_must_hwcache_align.patch kmem_cache-simplify-slab-cache-creation.patch slab-allocators-remove-multiple-alignment-specifications.patch fault-injection-fix-failslab-with-config_numa.patch mm-fix-handling-of-panic_on_oom-when-cpusets-are-in-use.patch slab-allocators-remove-slab_debug_initial-flag.patch slab-allocators-remove-slab_ctor_atomic.patch slab-allocators-remove-useless-__gfp_no_grow-flag.patch page-migration-only-migrate-pages-if-allocation-in-the-highest-zone-is-possible.patch quicklist-support-for-ia64.patch quicklist-support-for-x86_64.patch slub-exploit-page-mobility-to-increase-allocation-order.patch slub-mm-only-make-slub-the-default-slab-allocator.patch slub-i386-support.patch slab-shutdown-cache_reaper-when-cpu-goes-down.patch mm-implement-swap-prefetching.patch revoke-core-code-slab-allocators-remove-slab_debug_initial-flag-revoke.patch vmstat-use-our-own-timer-events.patch make-vm-statistics-update-interval-configurable.patch make-vm-statistics-update-interval-configurable-fix.patch readahead-state-based-method-aging-accounting.patch - To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html