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mm, hugetlb: fix and clean-up node iteration code to alloc or free 

Current node iteration code have a minor problem which do one more node
rotation if we can't succeed to allocate.  For example, if we start to
allocate at node 0, we stop to iterate at node 0.  Then we start to
allocate at node 1 for next allocation.

I introduce new macros "for_each_node_mask_to_[alloc|free]" and fix and
clean-up node iteration code to alloc or free.  This makes code more
understandable.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Hillf Danton <dhillf@gmail.com>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2013-09-11 14:21:00 -07:00 committed by Linus Torvalds
parent 81a6fcae3f
commit b226102682
1 changed files with 61 additions and 82 deletions
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139
mm/hugetlb.c
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@ -772,33 +772,6 @@ static int hstate_next_node_to_alloc(struct hstate *h,
return nid;
}
static int alloc_fresh_huge_page(struct hstate *h, nodemask_t *nodes_allowed)
{
struct page *page;
int start_nid;
int next_nid;
int ret = 0;
start_nid = hstate_next_node_to_alloc(h, nodes_allowed);
next_nid = start_nid;
do {
page = alloc_fresh_huge_page_node(h, next_nid);
if (page) {
ret = 1;
break;
}
next_nid = hstate_next_node_to_alloc(h, nodes_allowed);
} while (next_nid != start_nid);
if (ret)
count_vm_event(HTLB_BUDDY_PGALLOC);
else
count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
return ret;
}
/*
* helper for free_pool_huge_page() - return the previously saved
* node ["this node"] from which to free a huge page. Advance the
@ -817,6 +790,40 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
return nid;
}
#define for_each_node_mask_to_alloc(hs, nr_nodes, node, mask) \
for (nr_nodes = nodes_weight(*mask); \
nr_nodes > 0 && \
((node = hstate_next_node_to_alloc(hs, mask)) || 1); \
nr_nodes--)
#define for_each_node_mask_to_free(hs, nr_nodes, node, mask) \
for (nr_nodes = nodes_weight(*mask); \
nr_nodes > 0 && \
((node = hstate_next_node_to_free(hs, mask)) || 1); \
nr_nodes--)
static int alloc_fresh_huge_page(struct hstate *h, nodemask_t *nodes_allowed)
{
struct page *page;
int nr_nodes, node;
int ret = 0;
for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
page = alloc_fresh_huge_page_node(h, node);
if (page) {
ret = 1;
break;
}
}
if (ret)
count_vm_event(HTLB_BUDDY_PGALLOC);
else
count_vm_event(HTLB_BUDDY_PGALLOC_FAIL);
return ret;
}
/*
* Free huge page from pool from next node to free.
* Attempt to keep persistent huge pages more or less
@ -826,36 +833,31 @@ static int hstate_next_node_to_free(struct hstate *h, nodemask_t *nodes_allowed)
static int free_pool_huge_page(struct hstate *h, nodemask_t *nodes_allowed,
bool acct_surplus)
{
int start_nid;
int next_nid;
int nr_nodes, node;
int ret = 0;
start_nid = hstate_next_node_to_free(h, nodes_allowed);
next_nid = start_nid;
do {
for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
/*
* If we're returning unused surplus pages, only examine
* nodes with surplus pages.
*/
if ((!acct_surplus || h->surplus_huge_pages_node[next_nid]) &&
!list_empty(&h->hugepage_freelists[next_nid])) {
if ((!acct_surplus || h->surplus_huge_pages_node[node]) &&
!list_empty(&h->hugepage_freelists[node])) {
struct page *page =
list_entry(h->hugepage_freelists[next_nid].next,
list_entry(h->hugepage_freelists[node].next,
struct page, lru);
list_del(&page->lru);
h->free_huge_pages--;
h->free_huge_pages_node[next_nid]--;
h->free_huge_pages_node[node]--;
if (acct_surplus) {
h->surplus_huge_pages--;
h->surplus_huge_pages_node[next_nid]--;
h->surplus_huge_pages_node[node]--;
}
update_and_free_page(h, page);
ret = 1;
break;
}
next_nid = hstate_next_node_to_free(h, nodes_allowed);
} while (next_nid != start_nid);
}
return ret;
}
@ -1192,14 +1194,12 @@ static struct page *alloc_huge_page(struct vm_area_struct *vma,
int __weak alloc_bootmem_huge_page(struct hstate *h)
{
struct huge_bootmem_page *m;
int nr_nodes = nodes_weight(node_states[N_MEMORY]);
int nr_nodes, node;
while (nr_nodes) {
for_each_node_mask_to_alloc(h, nr_nodes, node, &node_states[N_MEMORY]) {
void *addr;
addr = __alloc_bootmem_node_nopanic(
NODE_DATA(hstate_next_node_to_alloc(h,
&node_states[N_MEMORY])),
addr = __alloc_bootmem_node_nopanic(NODE_DATA(node),
huge_page_size(h), huge_page_size(h), 0);
if (addr) {
@ -1211,7 +1211,6 @@ int __weak alloc_bootmem_huge_page(struct hstate *h)
m = addr;
goto found;
}
nr_nodes--;
}
return 0;
@ -1350,48 +1349,28 @@ static inline void try_to_free_low(struct hstate *h, unsigned long count,
static int adjust_pool_surplus(struct hstate *h, nodemask_t *nodes_allowed,
int delta)
{
int start_nid, next_nid;
int ret = 0;
int nr_nodes, node;
VM_BUG_ON(delta != -1 && delta != 1);
if (delta < 0)
start_nid = hstate_next_node_to_alloc(h, nodes_allowed);
else
start_nid = hstate_next_node_to_free(h, nodes_allowed);
next_nid = start_nid;
do {
int nid = next_nid;
if (delta < 0) {
/*
* To shrink on this node, there must be a surplus page
*/
if (!h->surplus_huge_pages_node[nid]) {
next_nid = hstate_next_node_to_alloc(h,
nodes_allowed);
continue;
}
}
if (delta > 0) {
/*
* Surplus cannot exceed the total number of pages
*/
if (h->surplus_huge_pages_node[nid] >=
h->nr_huge_pages_node[nid]) {
next_nid = hstate_next_node_to_free(h,
nodes_allowed);
continue;
for_each_node_mask_to_alloc(h, nr_nodes, node, nodes_allowed) {
if (h->surplus_huge_pages_node[node])
goto found;
}
} else {
for_each_node_mask_to_free(h, nr_nodes, node, nodes_allowed) {
if (h->surplus_huge_pages_node[node] <
h->nr_huge_pages_node[node])
goto found;
}
}
return 0;
found:
h->surplus_huge_pages += delta;
h->surplus_huge_pages_node[nid] += delta;
ret = 1;
break;
} while (next_nid != start_nid);
return ret;
h->surplus_huge_pages_node[node] += delta;
return 1;
}
#define persistent_huge_pages(h) (h->nr_huge_pages - h->surplus_huge_pages)