The patch titled
SLUB: mm-only: Make SLUB the default slab allocator
has been removed from the -mm tree. Its filename was
slub-mm-only-make-slub-the-default-slab-allocator.patch
This patch was dropped because it is obsolete
------------------------------------------------------
Subject: SLUB: mm-only: Make SLUB the default slab allocator
From: Christoph Lameter <clameter@xxxxxxx>
Make SLUB the default slab allocator
WARNING: This is a new allocator. No guarantees.
Known areas of concern:
A. i386 and FRV arches have been disabled by setting
ARCH_USES_SLAB_PAGE_STRUCT. SLUB cannot be enabled on those platforms.
The issue is that both arches use the page->index and page->private field
of memory allocated via the slab. SLUB uses these fields too. There are
a variety of patches out there (some by me, some by Bill Irwin) to address
this but without those you may be stuck until Bill Irwin comes up with a
definite solution.
B. There may be undiscovered locations in arch code that are as badly
behaved as i386 and FRV which will likely cause the arch not to boot
and fail with mysterious error messages.
C. Unlike SLAB, SLUB does not special case page sized allocations. SLAB
aligns kmallocs of page sized allocation on page boundaries.
SLUB also does that most of the time but does not guarantee alignment
beyond KMALLOC_ARCH_MINALIGN that is valid for other kmalloc slabs.
In particular enabling debugging will add some tracking information
to slabs which will usually cause page sized slabs to become no longer
aligned on page boundaries.
If there is arch code that relies on this behavior then we are likely
to see funky behavior. Code that uses page sized allocations via kmalloc
should either use the page allocator or explictly request page aligned
data from the slab by creating a custom slab with the needed alignment.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
init/Kconfig | 2 +-
1 files changed, 1 insertion(+), 1 deletion(-)
diff -puN init/Kconfig~slub-mm-only-make-slub-the-default-slab-allocator init/Kconfig
--- a/init/Kconfig~slub-mm-only-make-slub-the-default-slab-allocator
+++ a/init/Kconfig
@@ -554,7 +554,7 @@ config SLUB_DEBUG
choice
prompt "Choose SLAB allocator"
- default SLAB
+ default SLUB
help
This option allows to select a slab allocator.
_
Patches currently in -mm which might be from clameter@xxxxxxx are
git-ubi.patch
pa-risc-use-page-allocator-instead-of-slab-allocator.patch
usb-make-the-usb_device-numa_node-to-get-assigned-from.patch
quicklist-support-for-x86_64.patch
x86_64-get-mp_bus_to_node-as-early.patch
change-zonelist-order-zonelist-order-selection-logic.patch
make-proc-slabinfo-use-seq_list_xxx-helpers.patch
remove-the-deprecated-kmem_cache_t-typedef-from-slabh.patch
slub-support-slub_debug-on-by-default.patch
numa-mempolicy-dynamic-interleave-map-for-system-init.patch
numa-mempolicy-trivial-debug-fixes.patch
slob-initial-numa-support.patch
add-__gfp_movable-for-callers-to-flag-allocations-from-high-memory-that-may-be-migrated.patch
group-short-lived-and-reclaimable-kernel-allocations.patch
fix-calculation-in-move_freepages_block-for-counting-pages.patch
breakout-page_order-to-internalh-to-avoid-special-knowledge-of-the-buddy-allocator.patch
do-not-depend-on-max_order-when-grouping-pages-by-mobility.patch
print-out-statistics-in-relation-to-fragmentation-avoidance-to-proc-pagetypeinfo.patch
slub-mm-only-make-slub-the-default-slab-allocator.patch
have-kswapd-keep-a-minimum-order-free-other-than-order-0.patch
only-check-absolute-watermarks-for-alloc_high-and-alloc_harder-allocations.patch
slub-exploit-page-mobility-to-increase-allocation-order.patch
slub-reduce-antifrag-max-order.patch
slub-change-error-reporting-format-to-follow-lockdep-loosely.patch
slub-use-list_for_each_entry-for-loops-over-all-slabs.patch
slub-slab-validation-move-tracking-information-alloc-outside-of.patch
slub-ensure-that-the-object-per-slabs-stays-low-for-high-orders.patch
slub-debug-fix-initial-object-debug-state-of-numa-bootstrap-objects.patch
slab-allocators-consolidate-code-for-krealloc-in-mm-utilc.patch
slab-allocators-consistent-zero_size_ptr-support-and-null-result-semantics.patch
slab-allocators-support-__gfp_zero-in-all-allocators.patch
slub-add-some-more-inlines-and-ifdef-config_slub_debug.patch
slub-extract-dma_kmalloc_cache-from-get_cache.patch
slub-do-proper-locking-during-dma-slab-creation.patch
slub-faster-more-efficient-slab-determination-for-__kmalloc.patch
slub-simplify-dma-index-size-calculation.patch
mm-slubc-make-code-static.patch
slub-style-fix-up-the-loop-to-disable-small-slabs.patch
slub-do-not-use-length-parameter-in-slab_alloc.patch
slab-allocators-cleanup-zeroing-allocations.patch
slab-allocators-replace-explicit-zeroing-with-__gfp_zero.patch
slub-do-not-allocate-object-bit-array-on-stack.patch
slub-move-sysfs-operations-outside-of-slub_lock.patch
slub-fix-config_slub_debug-use-for-config_numa.patch
make-slub-the-default-allocator.patch
add-vm_bug_on-in-case-someone-uses-page_mapping-on-a-slab-page.patch
memory-unplug-v7-migration-by-kernel.patch
memory-unplug-v7-isolate_lru_page-fix.patch
define-config_bounce-to-avoid-useless-inclusion-of-bounce-buffer.patch
dma-make-dma-pool-to-use-kmalloc_node.patch
intel-iommu-dmar-detection-and-parsing-logic.patch
intel-iommu-pci-generic-helper-function.patch
intel-iommu-clflush_cache_range-now-takes-size-param.patch
intel-iommu-iova-allocation-and-management-routines.patch
intel-iommu-intel-iommu-driver.patch
intel-iommu-avoid-memory-allocation-failures-in-dma-map-api-calls.patch
intel-iommu-intel-iommu-cmdline-option-forcedac.patch
intel-iommu-dmar-fault-handling-support.patch
intel-iommu-iommu-gfx-workaround.patch
intel-iommu-iommu-floppy-workaround.patch
define-new-percpu-interface-for-shared-data-version-4.patch
use-the-new-percpu-interface-for-shared-data-version-4.patch
revoke-core-code.patch
mm-implement-swap-prefetching.patch
rename-gfp_high_movable-to-gfp_highuser_movable-prefetch.patch
cpuset-zero-malloc-revert-the-old-cpuset-fix.patch
containersv10-share-css_group-arrays-between-tasks-with-same-container-memberships-cpuset-zero-malloc-fix-for-new-containers.patch
page-owner-tracking-leak-detector.patch
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