[PATCH 1/4] hugetlb: add hstate_is_gigantic()

From: Luiz Capitulino
Date: Wed Apr 02 2014 - 14:09:33 EST


Signed-off-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
---
include/linux/hugetlb.h | 5 +++++
mm/hugetlb.c | 28 ++++++++++++++--------------
2 files changed, 19 insertions(+), 14 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 8c43cc4..8590134 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -333,6 +333,11 @@ static inline unsigned huge_page_shift(struct hstate *h)
return h->order + PAGE_SHIFT;
}

+static inline bool hstate_is_gigantic(struct hstate *h)
+{
+ return huge_page_order(h) >= MAX_ORDER;
+}
+
static inline unsigned int pages_per_huge_page(struct hstate *h)
{
return 1 << h->order;
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c01cb9f..8c50547 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -574,7 +574,7 @@ static void update_and_free_page(struct hstate *h, struct page *page)
{
int i;

- VM_BUG_ON(h->order >= MAX_ORDER);
+ VM_BUG_ON(hstate_is_gigantic(h));

h->nr_huge_pages--;
h->nr_huge_pages_node[page_to_nid(page)]--;
@@ -627,7 +627,7 @@ static void free_huge_page(struct page *page)
if (restore_reserve)
h->resv_huge_pages++;

- if (h->surplus_huge_pages_node[nid] && huge_page_order(h) < MAX_ORDER) {
+ if (h->surplus_huge_pages_node[nid] && !hstate_is_gigantic(h)) {
/* remove the page from active list */
list_del(&page->lru);
update_and_free_page(h, page);
@@ -731,7 +731,7 @@ static struct page *alloc_fresh_huge_page_node(struct hstate *h, int nid)
{
struct page *page;

- if (h->order >= MAX_ORDER)
+ if (hstate_is_gigantic(h))
return NULL;

page = alloc_pages_exact_node(nid,
@@ -925,7 +925,7 @@ static struct page *alloc_buddy_huge_page(struct hstate *h, int nid)
struct page *page;
unsigned int r_nid;

- if (h->order >= MAX_ORDER)
+ if (hstate_is_gigantic(h))
return NULL;

/*
@@ -1118,7 +1118,7 @@ static void return_unused_surplus_pages(struct hstate *h,
h->resv_huge_pages -= unused_resv_pages;

/* Cannot return gigantic pages currently */
- if (h->order >= MAX_ORDER)
+ if (hstate_is_gigantic(h))
return;

nr_pages = min(unused_resv_pages, h->surplus_huge_pages);
@@ -1328,7 +1328,7 @@ static void __init gather_bootmem_prealloc(void)
* fix confusing memory reports from free(1) and another
* side-effects, like CommitLimit going negative.
*/
- if (h->order > (MAX_ORDER - 1))
+ if (hstate_is_gigantic(h))
adjust_managed_page_count(page, 1 << h->order);
}
}
@@ -1338,7 +1338,7 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h)
unsigned long i;

for (i = 0; i < h->max_huge_pages; ++i) {
- if (h->order >= MAX_ORDER) {
+ if (hstate_is_gigantic(h)) {
if (!alloc_bootmem_huge_page(h))
break;
} else if (!alloc_fresh_huge_page(h,
@@ -1354,7 +1354,7 @@ static void __init hugetlb_init_hstates(void)

for_each_hstate(h) {
/* oversize hugepages were init'ed in early boot */
- if (h->order < MAX_ORDER)
+ if (!hstate_is_gigantic(h))
hugetlb_hstate_alloc_pages(h);
}
}
@@ -1388,7 +1388,7 @@ static void try_to_free_low(struct hstate *h, unsigned long count,
{
int i;

- if (h->order >= MAX_ORDER)
+ if (hstate_is_gigantic(h))
return;

for_each_node_mask(i, *nodes_allowed) {
@@ -1451,7 +1451,7 @@ static unsigned long set_max_huge_pages(struct hstate *h, unsigned long count,
{
unsigned long min_count, ret;

- if (h->order >= MAX_ORDER)
+ if (hstate_is_gigantic(h))
return h->max_huge_pages;

/*
@@ -1577,7 +1577,7 @@ static ssize_t nr_hugepages_store_common(bool obey_mempolicy,
goto out;

h = kobj_to_hstate(kobj, &nid);
- if (h->order >= MAX_ORDER) {
+ if (hstate_is_gigantic(h)) {
err = -EINVAL;
goto out;
}
@@ -1660,7 +1660,7 @@ static ssize_t nr_overcommit_hugepages_store(struct kobject *kobj,
unsigned long input;
struct hstate *h = kobj_to_hstate(kobj, NULL);

- if (h->order >= MAX_ORDER)
+ if (hstate_is_gigantic(h))
return -EINVAL;

err = kstrtoul(buf, 10, &input);
@@ -2071,7 +2071,7 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy,

tmp = h->max_huge_pages;

- if (write && h->order >= MAX_ORDER)
+ if (write && hstate_is_gigantic(h))
return -EINVAL;

table->data = &tmp;
@@ -2124,7 +2124,7 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write,

tmp = h->nr_overcommit_huge_pages;

- if (write && h->order >= MAX_ORDER)
+ if (write && hstate_is_gigantic(h))
return -EINVAL;

table->data = &tmp;
--
1.8.1.4

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