The patch titled
SLUB: avoid referencing kmem_cache structure in __slab_alloc
has been added to the -mm tree. Its filename is
slub-avoid-referencing-kmem_cache-structure-in-__slab_alloc.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: avoid referencing kmem_cache structure in __slab_alloc
From: Christoph Lameter <clameter@xxxxxxx>
There is the need to use the objects per slab in the first part of
__slab_alloc() which is still pretty hot. Copy the number of objects per slab
into the kmem_cache_cpu structure. That way we can get the value from a cache
line that we already need to touch. This brings the kmem_cache_cpu structure
up to 4 even words.
There is no increase in the size of kmem_cache_cpu since the size of object
is rounded to the next word.
Signed-off-by: Christoph Lameter <clameter@xxxxxxx>
Reviewed-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/slub_def.h | 1 +
mm/slub.c | 3 ++-
2 files changed, 3 insertions(+), 1 deletion(-)
diff -puN include/linux/slub_def.h~slub-avoid-referencing-kmem_cache-structure-in-__slab_alloc include/linux/slub_def.h
--- a/include/linux/slub_def.h~slub-avoid-referencing-kmem_cache-structure-in-__slab_alloc
+++ a/include/linux/slub_def.h
@@ -17,6 +17,7 @@ struct kmem_cache_cpu {
int node;
unsigned int offset;
unsigned int objsize;
+ unsigned int objects;
};
struct kmem_cache_node {
diff -puN mm/slub.c~slub-avoid-referencing-kmem_cache-structure-in-__slab_alloc mm/slub.c
--- a/mm/slub.c~slub-avoid-referencing-kmem_cache-structure-in-__slab_alloc
+++ a/mm/slub.c
@@ -1512,7 +1512,7 @@ load_freelist:
object = c->page->freelist;
c->freelist = object[c->offset];
- c->page->inuse = s->objects;
+ c->page->inuse = c->objects;
c->page->freelist = c->page->end;
c->node = page_to_nid(c->page);
unlock_out:
@@ -1896,6 +1896,7 @@ static void init_kmem_cache_cpu(struct k
c->node = 0;
c->offset = s->offset / sizeof(void *);
c->objsize = s->objsize;
+ c->objects = s->objects;
}
static void init_kmem_cache_node(struct kmem_cache_node *n)
_
Patches currently in -mm which might be from clameter@xxxxxxx are
ia64-slim-down-__clear_bit_unlock.patch
ia64-slim-down-__clear_bit_unlock-checkpatch-fixes.patch
mem-policy-fix-mempolicy-usage-in-pci-driver.patch
git-unionfs.patch
git-x86.patch
fix-mm-utilckrealloc.patch
pagecache-zeroing-zero_user_segment-zero_user_segments-and-zero_user.patch
move-vmalloc_to_page-to-mm-vmalloc.patch
vmalloc-add-const-to-void-parameters.patch
i386-resolve-dependency-of-asm-i386-pgtableh-on-highmemh.patch
i386-resolve-dependency-of-asm-i386-pgtableh-on-highmemh-checkpatch-fixes.patch
is_vmalloc_addr-check-if-an-address-is-within-the-vmalloc-boundaries.patch
vmalloc-clean-up-page-array-indexing.patch
vunmap-return-page-array-passed-on-vmap.patch
slub-move-count_partial.patch
slub-rename-numa-defrag_ratio-to-remote_node_defrag_ratio.patch
slub-consolidate-add_partial-and-add_partial_tail-to-one-function.patch
slub-use-non-atomic-bit-unlock.patch
slub-fix-coding-style-violations.patch
slub-fix-coding-style-violations-checkpatch-fixes.patch
slub-noinline-some-functions-to-avoid-them-being-folded-into-alloc-free.patch
slub-move-kmem_cache_node-determination-into-add_full-and-add_partial.patch
slub-avoid-checking-for-a-valid-object-before-zeroing-on-the-fast-path.patch
slub-__slab_alloc-exit-path-consolidation.patch
slub-provide-unique-end-marker-for-each-slab.patch
slub-provide-unique-end-marker-for-each-slab-fix.patch
slub-avoid-referencing-kmem_cache-structure-in-__slab_alloc.patch
slub-optional-fast-path-using-cmpxchg_local.patch
slub-do-our-own-locking-via-slab_lock-and-slab_unlock.patch
slub-restructure-slab-alloc.patch
vm-allow-get_page_unless_zero-on-compound-pages.patch
dentries-extract-common-code-to-remove-dentry-from-lru.patch
bufferhead-revert-constructor-removal.patch
bufferhead-revert-constructor-removal-checkpatch-fixes.patch
swapin_readahead-excise-numa-bogosity.patch
revoke-core-code.patch
slab-api-remove-useless-ctor-parameter-and-reorder-parameters-vs-revoke.patch
memcontrol-move-oom-task-exclusion-to-tasklist.patch
oom-add-sysctl-to-enable-task-memory-dump.patch
reiser4.patch
reiser4-portion-of-zero_user-cleanup-patch.patch
page-owner-tracking-leak-detector.patch
-
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