The patch titled
SLUB: Reduce the order of allocations to avoid fragmentation
has been removed from the -mm tree. Its filename was
slub-core-reduce-the-order-of-allocations-to-avoid-fragmentation.patch
This patch was dropped because it was folded into slub-core.patch
------------------------------------------------------
Subject: SLUB: Reduce the order of allocations to avoid fragmentation
From: Christoph Lameter <clameter@xxxxxxx>
Seems that fragmentation is an important subject. So be safe.
If an arch supports 4k page size then assume that defragmentation may be
a major problem. Reduce the minimum number of objects in a slab and
limit the order of slabs. Be a little bit more lenient for larger
page sizes.
Change the bootup message of SLUB to show the parameters so that
log is reviewed.
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slub.c | 28 ++++++++++++++++++++++++----
1 file changed, 24 insertions(+), 4 deletions(-)
diff -puN mm/slub.c~slub-core-reduce-the-order-of-allocations-to-avoid-fragmentation mm/slub.c
--- a/mm/slub.c~slub-core-reduce-the-order-of-allocations-to-avoid-fragmentation
+++ a/mm/slub.c
@@ -115,6 +115,25 @@
/* Enable to test recovery from slab corruption on boot */
#undef SLUB_RESILIENCY_TEST
+#if PAGE_SHIFT <= 12
+
+/*
+ * Small page size. Make sure that we do not fragment memory
+ */
+#define DEFAULT_MAX_ORDER 1
+#define DEFAULT_MIN_OBJECTS 4
+
+#else
+
+/*
+ * Large page machines are customarily able to handle larger
+ * page orders.
+ */
+#define DEFAULT_MAX_ORDER 2
+#define DEFAULT_MIN_OBJECTS 8
+
+#endif
+
/*
* Flags from the regular SLAB that SLUB does not support:
*/
@@ -1401,13 +1420,13 @@ static struct page *get_object_page(cons
* take the list_lock.
*/
static int slub_min_order;
-static int slub_max_order = 4;
+static int slub_max_order = DEFAULT_MAX_ORDER;
/*
* Minimum number of objects per slab. This is necessary in order to
* reduce locking overhead. Similar to the queue size in SLAB.
*/
-static int slub_min_objects = 8;
+static int slub_min_objects = DEFAULT_MIN_OBJECTS;
/*
* Merge control. If this is set then no merging of slab caches will occur.
@@ -2239,9 +2258,10 @@ void __init kmem_cache_init(void)
kmem_size = offsetof(struct kmem_cache, cpu_slab)
+ nr_cpu_ids * sizeof(struct page *);
- printk(KERN_INFO "SLUB: General Slabs=%d, HW alignment=%d, "
- "Processors=%d, Nodes=%d\n",
+ printk(KERN_INFO "SLUB: Genslabs=%d, HWalign=%d, Order=%d-%d, MinObjects=%d,"
+ " Processors=%d, Nodes=%d\n",
KMALLOC_SHIFT_HIGH, L1_CACHE_BYTES,
+ slub_min_order, slub_max_order, slub_min_objects,
nr_cpu_ids, nr_node_ids);
}
_
Patches currently in -mm which might be from clameter@xxxxxxx are
extend-print_symbol-capability.patch
slab-introduce-krealloc.patch
ia64-sn-xpc-convert-to-use-kthread-api-fix.patch
ia64-sn-xpc-convert-to-use-kthread-api-fix-2.patch
add-apply_to_page_range-which-applies-a-function-to-a-pte-range.patch
add-apply_to_page_range-which-applies-a-function-to-a-pte-range-fix.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-core-reduce-the-order-of-allocations-to-avoid-fragmentation.patch
slub-core-sysfs-support-fix-unique-id-generation.patch
slub-core-printk-cleanup-object_err.patch
slub-core-printk-cleanup-add-slab_err.patch
slub-core-printk-cleanup-fix-up-printks-in-the-resiliency-check.patch
slub-core-fix-slab-validation-error-in-bootstrap-cache.patch
slub-core-remove-per-cpu-flusher.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-validation-of-slabs-metadata-and-guard-zones-fix-pageerror-checks-during-validation.patch
slub-validation-of-slabs-metadata-and-guard-zones-remove-duplicate-vm_bug_on.patch
slub-validation-of-slabs-metadata-and-guard-zones-printk-cleanup-slab-validation-printks.patch
slub-add-min_partial.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-free-slabs-and-sort-partial-slab-lists-in-kmem_cache_shrink.patch
slub-free-slabs-and-sort-partial-slab-lists-in-kmem_cache_shrink-fixes-to-kmem_cache_shrink.patch
slub-remove-object-activities-out-of-checking-functions.patch
slub-remove-object-activities-out-of-checking-functions-printk-cleanup-diagnostic-functions.patch
slub-user-documentation.patch
slub-user-documentation-fix.patch
slub-add-slabinfo-tool.patch
slub-add-slabinfo-tool-update-slabinfoc.patch
slub-major-slabinfo-update.patch
slub-slabinfo-remove-hackname.patch
slub-slabinfo-more-statistic-fixes-and-handling-fixes.patch
slub-exploit-page-mobility-to-increase-allocation-order.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
quicklists-for-page-table-pages-avoid-useless-virt_to_page-conversion-fix.patch
quicklist-support-for-ia64.patch
quicklist-support-for-x86_64.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-slab_debug_initial-flag.patch
slab-allocators-remove-slab_debug_initial-flag-locks-fix.patch
slab-allocators-remove-multiple-alignment-specifications.patch
slab-allocators-remove-slab_ctor_atomic.patch
fault-injection-fix-failslab-with-config_numa.patch
mm-fix-handling-of-panic_on_oom-when-cpusets-are-in-use.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
readahead-state-based-method-aging-accounting.patch
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