The patch titled
SLUB: mm-only: Make SLUB the default slab allocator
has been added to the -mm tree. Its filename is
slub-mm-only-make-slub-the-default-slab-allocator.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: 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 | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
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
@@ -521,7 +521,7 @@ config PROC_KPAGEMAP
choice
prompt "Choose SLAB allocator"
- default SLAB
+ default SLUB
help
This option allows to select a slab allocator.
@@ -534,7 +534,7 @@ config SLAB
slab allocator.
config SLUB
- depends on EXPERIMENTAL && !ARCH_USES_SLAB_PAGE_STRUCT
+ depends on !ARCH_USES_SLAB_PAGE_STRUCT
bool "SLUB (Unqueued Allocator)"
help
SLUB is a slab allocator that minimizes cache line usage
_
Patches currently in -mm which might be from clameter@xxxxxxx are
slab-introduce-krealloc.patch
slab-introduce-krealloc-fix.patch
paravirt_ops-allow-paravirt-backend-to-choose-kernel-pmd-sharing.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
smaps-add-clear_refs-file-to-clear-reference-fix.patch
smaps-add-clear_refs-file-to-clear-reference-fix-fix.patch
slab-use-num_possible_cpus-in-enable_cpucache.patch
extend-print_symbol-capability-fix.patch
i386-use-page-allocator-to-allocate-thread_info-structure.patch
slub-core.patch
slub-fix-numa-bootstrap.patch
slub-use-correct-flags-to-check-for-dma-cache.patch
slub-treat-slab_hwcache_align-as-a-mininum-and-not-as-the-alignment.patch
slub-core-minor-fixes.patch
slub-core-use-enum-for-tracking-modes-instead-of-integers.patch
slub-core-fix-another-numa-bootstrap-issue.patch
slub-core-fix-object-counting.patch
slub-core-drop-version-number.patch
slub-core-tidy.patch
slub-core-tidy-2.patch
slub-core-tidy-3.patch
slub-core-tidy-4.patch
slub-core-tidy-5.patch
slub-core-tidy-6.patch
slub-core-tidy-7.patch
slub-core-tidy-8.patch
slub-core-tidy-9.patch
slub-core-we-do-not-need-ifdef-config_smp-around-bit-spinlocks.patch
slub-core-printk-facility-level-cleanup.patch
slub-core-kmem_cache_close-is-static-and-should-not-be-exported.patch
slub-core-add-explanation-for-defrag_ratio-=-100.patch
slub-core-add-explanation-for-locking.patch
slub-core-add-explanation-for-locking-fix.patch
slub-core-explain-the-64k-limits.patch
slub-core-explain-sizing-of-slabs-in-detail.patch
slub-core-explain-sizing-of-slabs-in-detail-fix.patch
slub-core-add-checks-for-interrupts-disabled.patch
slub-add-slabinfo-tool.patch
slub-add-slabinfo-tool-update-slabinfoc.patch
make-page-private-usable-in-compound-pages-v1.patch
make-page-private-usable-in-compound-pages-v1-hugetlb-fix.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-enable-tracking-of-full-slabs-fix.patch
slub-enable-tracking-of-full-slabs-add-checks-for-interrupts-disabled.patch
slub-validation-of-slabs-metadata-and-guard-zones.patch
slub-add-ability-to-list-alloc--free-callers-per-slab.patch
slub-add-ability-to-list-alloc--free-callers-per-slab-tidy.patch
slub-user-documentation.patch
slub-user-documentation-fix.patch
slub-mm-only-make-slub-the-default-slab-allocator.patch
quicklists-for-page-table-pages.patch
quicklists-for-page-table-pages-avoid-useless-virt_to_page-conversion.patch
quicklist-support-for-ia64.patch
quicklist-support-for-x86_64.patch
quicklist-support-for-sparc64.patch
slab-shutdown-cache_reaper-when-cpu-goes-down.patch
mm-implement-swap-prefetching.patch
readahead-state-based-method-aging-accounting.patch
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