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mm/hugetlb: add available_huge_pages() func

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In hugetlb.c there are several places which compare the values of
'h->free_huge_pages' and 'h->resv_huge_pages', it looks a bit messy, so
add a new available_huge_pages() function to do these.

Link: https://lkml.kernel.org/r/20220922021929.98961-1-xhao@linux.alibaba.com
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Xin Hao 2022-09-22 10:19:29 +08:00 committed by Andrew Morton
parent 6b91e5dfb3
commit 8346d69d8b
1 changed files with 9 additions and 5 deletions
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14
mm/hugetlb.c
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@ -1191,6 +1191,11 @@ retry_cpuset:
return NULL;
}
static unsigned long available_huge_pages(struct hstate *h)
{
return h->free_huge_pages - h->resv_huge_pages;
}
static struct page *dequeue_huge_page_vma(struct hstate *h,
struct vm_area_struct *vma,
unsigned long address, int avoid_reserve,
@ -1207,12 +1212,11 @@ static struct page *dequeue_huge_page_vma(struct hstate *h,
* have no page reserves. This check ensures that reservations are
* not "stolen". The child may still get SIGKILLed
*/
if (!vma_has_reserves(vma, chg) &&
h->free_huge_pages - h->resv_huge_pages == 0)
if (!vma_has_reserves(vma, chg) && !available_huge_pages(h))
goto err;
/* If reserves cannot be used, ensure enough pages are in the pool */
if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0)
if (avoid_reserve && !available_huge_pages(h))
goto err;
gfp_mask = htlb_alloc_mask(h);
@ -2124,7 +2128,7 @@ retry:
if (!page_count(page)) {
struct page *head = compound_head(page);
struct hstate *h = page_hstate(head);
if (h->free_huge_pages - h->resv_huge_pages == 0)
if (!available_huge_pages(h))
goto out;
/*
@ -2311,7 +2315,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
nodemask_t *nmask, gfp_t gfp_mask)
{
spin_lock_irq(&hugetlb_lock);
if (h->free_huge_pages - h->resv_huge_pages > 0) {
if (available_huge_pages(h)) {
struct page *page;
page = dequeue_huge_page_nodemask(h, gfp_mask, preferred_nid, nmask);