On Wed 14-06-17 15:18:26, Vlastimil Babka wrote:
> On 06/13/2017 11:00 AM, Michal Hocko wrote:
[...]
> > @@ -1717,13 +1640,22 @@ struct page *alloc_huge_page_node(struct hstate *h, int nid)
> > page = dequeue_huge_page_node(h, nid);
> > spin_unlock(&hugetlb_lock);
> >
> > - if (!page)
> > - page = __alloc_buddy_huge_page_no_mpol(h, nid);
> > + if (!page) {
> > + nodemask_t nmask;
> > +
> > + if (nid != NUMA_NO_NODE) {
> > + nmask = NODE_MASK_NONE;
> > + node_set(nid, nmask);
>
> TBH I don't like this hack too much, and would rather see __GFP_THISNODE
> involved, which picks a different (short) zonelist. Also it's allocating
> nodemask on stack, which we generally avoid? Although the callers
> currently seem to be shallow.
Fair enough. That would require pulling gfp mask handling up the call
chain. This on top of this patch + refreshes for other patches later in
the series as they will conflict now?
---
commit dcd863b48fb2c93e5aebce818e75c30978e26cf1
Author: Michal Hocko <mhocko@xxxxxxxx>
Date: Wed Jun 14 15:41:07 2017 +0200
fold me
- pull gfp mask out of __hugetlb_alloc_buddy_huge_page and make it an
explicit argument to allow __GFP_THISNODE in alloc_huge_page_node per
Vlastimil
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3d5f25d589b3..afc87de5de5c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1532,17 +1532,18 @@ int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
}
static struct page *__hugetlb_alloc_buddy_huge_page(struct hstate *h,
- int nid, nodemask_t *nmask)
+ gfp_t gfp_mask, int nid, nodemask_t *nmask)
{
int order = huge_page_order(h);
- gfp_t gfp = htlb_alloc_mask(h)|__GFP_COMP|__GFP_REPEAT|__GFP_NOWARN;
+ gfp_mask |= __GFP_COMP|__GFP_REPEAT|__GFP_NOWARN;
if (nid == NUMA_NO_NODE)
nid = numa_mem_id();
- return __alloc_pages_nodemask(gfp, order, nid, nmask);
+ return __alloc_pages_nodemask(gfp_mask, order, nid, nmask);
}
-static struct page *__alloc_buddy_huge_page(struct hstate *h, int nid, nodemask_t *nmask)
+static struct page *__alloc_buddy_huge_page(struct hstate *h, gfp_t gfp_mask,
+ int nid, nodemask_t *nmask)
{
struct page *page;
unsigned int r_nid;
@@ -1583,7 +1584,7 @@ static struct page *__alloc_buddy_huge_page(struct hstate *h, int nid, nodemask_
}
spin_unlock(&hugetlb_lock);
- page = __hugetlb_alloc_buddy_huge_page(h, nid, nmask);
+ page = __hugetlb_alloc_buddy_huge_page(h, gfp_mask, nid, nmask);
spin_lock(&hugetlb_lock);
if (page) {
@@ -1616,11 +1617,12 @@ struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h,
{
struct page *page;
struct mempolicy *mpol;
+ gfp_t gfp_mask = htlb_alloc_mask(h);
int nid;
nodemask_t *nodemask;
- nid = huge_node(vma, addr, htlb_alloc_mask(h), &mpol, &nodemask);
- page = __alloc_buddy_huge_page(h, nid, nodemask);
+ nid = huge_node(vma, addr, gfp_mask, &mpol, &nodemask);
+ page = __alloc_buddy_huge_page(h, gfp_mask, nid, nodemask);
mpol_cond_put(mpol);
return page;
@@ -1633,30 +1635,26 @@ struct page *__alloc_buddy_huge_page_with_mpol(struct hstate *h,
*/
struct page *alloc_huge_page_node(struct hstate *h, int nid)
{
+ gfp_t gfp_mask = htlb_alloc_mask(h);
struct page *page = NULL;
+ if (nid != NUMA_NO_NODE)
+ gfp_mask |= __GFP_THISNODE;
+
spin_lock(&hugetlb_lock);
if (h->free_huge_pages - h->resv_huge_pages > 0)
page = dequeue_huge_page_node(h, nid);
spin_unlock(&hugetlb_lock);
- if (!page) {
- nodemask_t nmask;
-
- if (nid != NUMA_NO_NODE) {
- nmask = NODE_MASK_NONE;
- node_set(nid, nmask);
- } else {
- nmask = node_states[N_MEMORY];
- }
- page = __alloc_buddy_huge_page(h, nid, &nmask);
- }
+ if (!page)
+ page = __alloc_buddy_huge_page(h, gfp_mask, nid, NULL);
return page;
}
struct page *alloc_huge_page_nodemask(struct hstate *h, nodemask_t *nmask)
{
+ gfp_t gfp_mask = htlb_alloc_mask(h);
struct page *page = NULL;
int node;
@@ -1673,7 +1671,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, nodemask_t *nmask)
return page;
/* No reservations, try to overcommit */
- return __alloc_buddy_huge_page(h, NUMA_NO_NODE, nmask);
+ return __alloc_buddy_huge_page(h, gfp_mask, NUMA_NO_NODE, nmask);
}
/*
@@ -1701,7 +1699,8 @@ static int gather_surplus_pages(struct hstate *h, int delta)
retry:
spin_unlock(&hugetlb_lock);
for (i = 0; i < needed; i++) {
- page = __alloc_buddy_huge_page(h, NUMA_NO_NODE, NULL);
+ page = __alloc_buddy_huge_page(h, htlb_alloc_mask(h),
+ NUMA_NO_NODE, NULL);
if (!page) {
alloc_ok = false;
break;
--
Michal Hocko
SUSE Labs
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