From: Christoph Lameter <cl@linux.com>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: David Rientjes <rientjes@google.com>,
Hugh Dickins <hughd@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
linux-mm@kvack.org
Subject: [slubllv333num@/21] slub: Per object NUMA support
Date: Fri, 15 Apr 2011 15:12:52 -0500 [thread overview]
Message-ID: <20110415201258.442821107@linux.com> (raw)
In-Reply-To: 20110415201246.096634892@linux.com
[-- Attachment #1: rr_slabs --]
[-- Type: text/plain, Size: 1897 bytes --]
Currently slub applies NUMA policies per allocated slab page. Change
that to apply memory policies for each individual object allocated.
F.e. before this patch MPOL_INTERLEAVE would return objects from the
same slab page until a new slab page was allocated. Now an object
from a different page is taken for each allocation.
This increases the overhead of the fastpath under NUMA.
Signed-off-by: Christoph Lameter <cl@linux.com>
---
mm/slub.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c 2011-04-15 12:54:42.000000000 -0500
+++ linux-2.6/mm/slub.c 2011-04-15 13:11:25.000000000 -0500
@@ -1887,6 +1887,21 @@ debug:
goto unlock_out;
}
+static __always_inline int alternate_slab_node(struct kmem_cache *s,
+ gfp_t flags, int node)
+{
+#ifdef CONFIG_NUMA
+ if (unlikely(node == NUMA_NO_NODE &&
+ !(flags & __GFP_THISNODE) &&
+ !in_interrupt())) {
+ if ((s->flags & SLAB_MEM_SPREAD) && cpuset_do_slab_mem_spread())
+ node = cpuset_slab_spread_node();
+ else if (current->mempolicy)
+ node = slab_node(current->mempolicy);
+ }
+#endif
+ return node;
+}
/*
* Inlined fastpath so that allocation functions (kmalloc, kmem_cache_alloc)
* have the fastpath folded into their functions. So no function call
@@ -1911,6 +1926,7 @@ static __always_inline void *slab_alloc(
if (slab_pre_alloc_hook(s, gfpflags))
return NULL;
+ node = alternate_slab_node(s, gfpflags, node);
#ifndef CONFIG_CMPXCHG_LOCAL
local_irq_save(flags);
#else
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next prev parent reply other threads:[~2011-04-15 20:13 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-15 20:12 [slubllv333num@/21] SLUB: Lockless freelists for objects V3 Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Use NUMA_NO_NODE in get_partial Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: get_map() function to establish map of free objects in a slab Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Eliminate repeated use of c->page through a new page variable Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Move node determination out of hotpath Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Move debug handlign in __slab_free Christoph Lameter
2011-04-15 20:12 ` Christoph Lameter [this message]
2011-04-15 20:12 ` [slubllv333num@/21] slub: Do not use frozen page flag but a bit in the page counters Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Move page->frozen handling near where the page->freelist handling occurs Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] x86: Add support for cmpxchg_double Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] mm: Rearrange struct page Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Add cmpxchg_double_slab() Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: explicit list_lock taking Christoph Lameter
2011-04-15 20:12 ` [slubllv333num@/21] slub: Pass kmem_cache struct to lock and freeze slab Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: Rework allocator fastpaths Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: Invert locking and avoid slab lock Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: Disable interrupts in free_debug processing Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: Avoid disabling interrupts in free slowpath Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: Get rid of the another_slab label Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: fast release on full slab Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: Not necessary to check for empty slab on load_freelist Christoph Lameter
2011-04-15 20:13 ` [slubllv333num@/21] slub: update statistics for cmpxchg handling Christoph Lameter
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