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page allocator: do not check NUMA node ID when the caller knows the node is valid

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Callers of alloc_pages_node() can optionally specify -1 as a node to mean
"allocate from the current node".  However, a number of the callers in
fast paths know for a fact their node is valid.  To avoid a comparison and
branch, this patch adds alloc_pages_exact_node() that only checks the nid
with VM_BUG_ON().  Callers that know their node is valid are then
converted.

Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Acked-by: Paul Mundt <lethal@linux-sh.org>	[for the SLOB NUMA bits]
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2009-06-16 15:31:54 -07:00 committed by Linus Torvalds
parent b3c466ce51
commit 6484eb3e2a
17 changed files with 33 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/ia64/hp/common/sba_iommu.c
View File

@ -1131,7 +1131,7 @@ sba_alloc_coherent (struct device *dev, size_t size, dma_addr_t *dma_handle, gfp
#ifdef CONFIG_NUMA
{
struct page *page;
page = alloc_pages_node(ioc->node == MAX_NUMNODES ?
page = alloc_pages_exact_node(ioc->node == MAX_NUMNODES ?
numa_node_id() : ioc->node, flags,
get_order(size));

3
arch/ia64/kernel/mca.c
View File

@ -1829,8 +1829,7 @@ ia64_mca_cpu_init(void *cpu_data)
data = mca_bootmem();
first_time = 0;
} else
data = page_address(alloc_pages_node(numa_node_id(),
GFP_KERNEL, get_order(sz)));
data = __get_free_pages(GFP_KERNEL, get_order(sz));
if (!data)
panic("Could not allocate MCA memory for cpu %d\n",
cpu);

3
arch/ia64/kernel/uncached.c
View File

@ -98,7 +98,8 @@ static int uncached_add_chunk(struct uncached_pool *uc_pool, int nid)
/* attempt to allocate a granule's worth of cached memory pages */
page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
page = alloc_pages_exact_node(nid,
GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
IA64_GRANULE_SHIFT-PAGE_SHIFT);
if (!page) {
mutex_unlock(&uc_pool->add_chunk_mutex);

3
arch/ia64/sn/pci/pci_dma.c
View File

@ -90,7 +90,8 @@ static void *sn_dma_alloc_coherent(struct device *dev, size_t size,
*/
node = pcibus_to_node(pdev->bus);
if (likely(node >=0)) {
struct page *p = alloc_pages_node(node, flags, get_order(size));
struct page *p = alloc_pages_exact_node(node,
flags, get_order(size));
if (likely(p))
cpuaddr = page_address(p);

4
arch/powerpc/platforms/cell/ras.c
View File

@ -122,8 +122,8 @@ static int __init cbe_ptcal_enable_on_node(int nid, int order)
area->nid = nid;
area->order = order;
area->pages = alloc_pages_node(area->nid, GFP_KERNEL | GFP_THISNODE,
area->order);
area->pages = alloc_pages_exact_node(area->nid, GFP_KERNEL|GFP_THISNODE,
area->order);
if (!area->pages) {
printk(KERN_WARNING "%s: no page on node %d\n",

2
arch/x86/kvm/vmx.c
View File

@ -1277,7 +1277,7 @@ static struct vmcs *alloc_vmcs_cpu(int cpu)
struct page *pages;
struct vmcs *vmcs;
pages = alloc_pages_node(node, GFP_KERNEL, vmcs_config.order);
pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
if (!pages)
return NULL;
vmcs = page_address(pages);

2
drivers/misc/sgi-gru/grufile.c
View File

@ -302,7 +302,7 @@ static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
pnode = uv_node_to_pnode(nid);
if (bid < 0 || gru_base[bid])
continue;
page = alloc_pages_node(nid, GFP_KERNEL, order);
page = alloc_pages_exact_node(nid, GFP_KERNEL, order);
if (!page)
goto fail;
gru_base[bid] = page_address(page);

2
drivers/misc/sgi-xp/xpc_uv.c
View File

@ -232,7 +232,7 @@ xpc_create_gru_mq_uv(unsigned int mq_size, int cpu, char *irq_name,
mq->mmr_blade = uv_cpu_to_blade_id(cpu);
nid = cpu_to_node(cpu);
page = alloc_pages_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
page = alloc_pages_exact_node(nid, GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
pg_order);
if (page == NULL) {
dev_err(xpc_part, "xpc_create_gru_mq_uv() failed to alloc %d "

9
include/linux/gfp.h
View File

@ -5,6 +5,7 @@
#include <linux/stddef.h>
#include <linux/linkage.h>
#include <linux/topology.h>
#include <linux/mmdebug.h>
struct vm_area_struct;
@ -192,6 +193,14 @@ static inline struct page *alloc_pages_node(int nid, gfp_t gfp_mask,
return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
}
static inline struct page *alloc_pages_exact_node(int nid, gfp_t gfp_mask,
unsigned int order)
{
VM_BUG_ON(nid < 0 || nid >= MAX_NUMNODES);
return __alloc_pages(gfp_mask, order, node_zonelist(nid, gfp_mask));
}
#ifdef CONFIG_NUMA
extern struct page *alloc_pages_current(gfp_t gfp_mask, unsigned order);

1
include/linux/mm.h
View File

@ -7,7 +7,6 @@
#include <linux/gfp.h>
#include <linux/list.h>
#include <linux/mmdebug.h>
#include <linux/mmzone.h>
#include <linux/rbtree.h>
#include <linux/prio_tree.h>

8
kernel/profile.c
View File

@ -365,7 +365,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
node = cpu_to_node(cpu);
per_cpu(cpu_profile_flip, cpu) = 0;
if (!per_cpu(cpu_profile_hits, cpu)[1]) {
page = alloc_pages_node(node,
page = alloc_pages_exact_node(node,
GFP_KERNEL | __GFP_ZERO,
0);
if (!page)
@ -373,7 +373,7 @@ static int __cpuinit profile_cpu_callback(struct notifier_block *info,
per_cpu(cpu_profile_hits, cpu)[1] = page_address(page);
}
if (!per_cpu(cpu_profile_hits, cpu)[0]) {
page = alloc_pages_node(node,
page = alloc_pages_exact_node(node,
GFP_KERNEL | __GFP_ZERO,
0);
if (!page)
@ -564,14 +564,14 @@ static int create_hash_tables(void)
int node = cpu_to_node(cpu);
struct page *page;
page = alloc_pages_node(node,
page = alloc_pages_exact_node(node,
GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
0);
if (!page)
goto out_cleanup;
per_cpu(cpu_profile_hits, cpu)[1]
= (struct profile_hit *)page_address(page);
page = alloc_pages_node(node,
page = alloc_pages_exact_node(node,
GFP_KERNEL | __GFP_ZERO | GFP_THISNODE,
0);
if (!page)

2
mm/filemap.c
View File

@ -521,7 +521,7 @@ struct page *__page_cache_alloc(gfp_t gfp)
{
if (cpuset_do_page_mem_spread()) {
int n = cpuset_mem_spread_node();
return alloc_pages_node(n, gfp, 0);
return alloc_pages_exact_node(n, gfp, 0);
}
return alloc_pages(gfp, 0);
}

4
mm/hugetlb.c
View File

@ -630,7 +630,7 @@ static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
if (h->order >= MAX_ORDER)
return NULL;
page = alloc_pages_node(nid,
page = alloc_pages_exact_node(nid,
htlb_alloc_mask|__GFP_COMP|__GFP_THISNODE|
__GFP_REPEAT|__GFP_NOWARN,
huge_page_order(h));
@ -649,7 +649,7 @@ static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
* Use a helper variable to find the next node and then
* copy it back to hugetlb_next_nid afterwards:
* otherwise there's a window in which a racer might
* pass invalid nid MAX_NUMNODES to alloc_pages_node.
* pass invalid nid MAX_NUMNODES to alloc_pages_exact_node.
* But we don't need to use a spin_lock here: it really
* doesn't matter if occasionally a racer chooses the
* same nid as we do. Move nid forward in the mask even

2
mm/mempolicy.c
View File

@ -803,7 +803,7 @@ static void migrate_page_add(struct page *page, struct list_head *pagelist,
static struct page *new_node_page(struct page *page, unsigned long node, int **x)
{
return alloc_pages_node(node, GFP_HIGHUSER_MOVABLE, 0);
return alloc_pages_exact_node(node, GFP_HIGHUSER_MOVABLE, 0);
}
/*

2
mm/migrate.c
View File

@ -802,7 +802,7 @@ static struct page *new_page_node(struct page *p, unsigned long private,
*result = &pm->status;
return alloc_pages_node(pm->node,
return alloc_pages_exact_node(pm->node,
GFP_HIGHUSER_MOVABLE | GFP_THISNODE, 0);
}

4
mm/slab.c
View File

@ -1707,7 +1707,7 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
flags |= __GFP_RECLAIMABLE;
page = alloc_pages_node(nodeid, flags, cachep->gfporder);
page = alloc_pages_exact_node(nodeid, flags, cachep->gfporder);
if (!page)
return NULL;
@ -3261,7 +3261,7 @@ retry:
if (local_flags & __GFP_WAIT)
local_irq_enable();
kmem_flagcheck(cache, flags);
obj = kmem_getpages(cache, local_flags, -1);
obj = kmem_getpages(cache, local_flags, numa_node_id());
if (local_flags & __GFP_WAIT)
local_irq_disable();
if (obj) {

4
mm/slob.c
View File

@ -46,7 +46,7 @@
* NUMA support in SLOB is fairly simplistic, pushing most of the real
* logic down to the page allocator, and simply doing the node accounting
* on the upper levels. In the event that a node id is explicitly
* provided, alloc_pages_node() with the specified node id is used
* provided, alloc_pages_exact_node() with the specified node id is used
* instead. The common case (or when the node id isn't explicitly provided)
* will default to the current node, as per numa_node_id().
*
@ -244,7 +244,7 @@ static void *slob_new_pages(gfp_t gfp, int order, int node)
#ifdef CONFIG_NUMA
if (node != -1)
page = alloc_pages_node(node, gfp, order);
page = alloc_pages_exact_node(node, gfp, order);
else
#endif
page = alloc_pages(gfp, order);