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Subject[PATCH 03/35] Do not check NUMA node ID when the caller knows the node is valid
Date
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>
---
arch/ia64/hp/common/sba_iommu.c | 2 +-
arch/ia64/kernel/mca.c | 3 +--
arch/ia64/kernel/uncached.c | 3 ++-
arch/ia64/sn/pci/pci_dma.c | 3 ++-
arch/powerpc/platforms/cell/ras.c | 2 +-
arch/x86/kvm/vmx.c | 2 +-
drivers/misc/sgi-gru/grufile.c | 2 +-
drivers/misc/sgi-xp/xpc_uv.c | 2 +-
include/linux/gfp.h | 9 +++++++++
include/linux/mm.h | 1 -
kernel/profile.c | 8 ++++----
mm/filemap.c | 2 +-
mm/hugetlb.c | 4 ++--
mm/mempolicy.c | 2 +-
mm/migrate.c | 2 +-
mm/slab.c | 4 ++--
mm/slob.c | 4 ++--
17 files changed, 32 insertions(+), 23 deletions(-)
diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index 6d5e6c5..66a3257 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1116,7 +1116,7 @@ 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));

diff --git a/arch/ia64/kernel/mca.c b/arch/ia64/kernel/mca.c
index bab1de2..2e614bd 100644
--- a/arch/ia64/kernel/mca.c
+++ b/arch/ia64/kernel/mca.c
@@ -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);
diff --git a/arch/ia64/kernel/uncached.c b/arch/ia64/kernel/uncached.c
index 8eff8c1..6ba72ab 100644
--- a/arch/ia64/kernel/uncached.c
+++ b/arch/ia64/kernel/uncached.c
@@ -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);
diff --git a/arch/ia64/sn/pci/pci_dma.c b/arch/ia64/sn/pci/pci_dma.c
index 863f501..2aa52de 100644
--- a/arch/ia64/sn/pci/pci_dma.c
+++ b/arch/ia64/sn/pci/pci_dma.c
@@ -91,7 +91,8 @@ 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);
diff --git a/arch/powerpc/platforms/cell/ras.c b/arch/powerpc/platforms/cell/ras.c
index 5f961c4..16ba671 100644
--- a/arch/powerpc/platforms/cell/ras.c
+++ b/arch/powerpc/platforms/cell/ras.c
@@ -122,7 +122,7 @@ 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, area->order);
+ area->pages = alloc_pages_exact_node(area->nid, GFP_KERNEL, area->order);

if (!area->pages)
goto out_free_area;
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 7611af5..cca119a 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1244,7 +1244,7 @@ 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);
diff --git a/drivers/misc/sgi-gru/grufile.c b/drivers/misc/sgi-gru/grufile.c
index 6509838..52d4160 100644
--- a/drivers/misc/sgi-gru/grufile.c
+++ b/drivers/misc/sgi-gru/grufile.c
@@ -309,7 +309,7 @@ static int gru_init_tables(unsigned long gru_base_paddr, void *gru_base_vaddr)
pnode = uv_node_to_pnode(nid);
if (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);
diff --git a/drivers/misc/sgi-xp/xpc_uv.c b/drivers/misc/sgi-xp/xpc_uv.c
index 29c0502..0563350 100644
--- a/drivers/misc/sgi-xp/xpc_uv.c
+++ b/drivers/misc/sgi-xp/xpc_uv.c
@@ -184,7 +184,7 @@ 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 "
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 8736047..59eb093 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -4,6 +4,7 @@
#include <linux/mmzone.h>
#include <linux/stddef.h>
#include <linux/linkage.h>
+#include <linux/mmdebug.h>

struct vm_area_struct;

@@ -188,6 +189,14 @@ 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);

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 065cdf8..565e7b2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -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>
diff --git a/kernel/profile.c b/kernel/profile.c
index 7724e04..62e08db 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -371,7 +371,7 @@ 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)
@@ -379,7 +379,7 @@ 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)
@@ -570,14 +570,14 @@ 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)
diff --git a/mm/filemap.c b/mm/filemap.c
index 23acefe..2523d95 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -519,7 +519,7 @@ 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);
}
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 107da3d..1e99997 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 3eb4a6f..341fbca 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -767,7 +767,7 @@ 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);
}

/*
diff --git a/mm/migrate.c b/mm/migrate.c
index a9eff3f..6bda9c2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -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);
}

diff --git a/mm/slab.c b/mm/slab.c
index 4d00855..e7f1ded 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1680,7 +1680,7 @@ 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;

@@ -3210,7 +3210,7 @@ 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) {
diff --git a/mm/slob.c b/mm/slob.c
index 52bc8a2..d646a4c 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -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().
*
@@ -236,7 +236,7 @@ static void *slob_new_page(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);
--
1.5.6.5


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