Modify region_add() to keep track of regions(pages) added to the
reserve map and return this value. The return value can be
compared to the return value of region_chg() to determine if the
map was modified between calls. Make vma_commit_reservation()
also pass along the return value of region_add(). The special
case return values of vma_needs_reservation() should also be
taken into account when determining the return value of
vma_commit_reservation().
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
---
mm/hugetlb.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c41b2a0..7f64034 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -156,6 +156,7 @@ static long region_add(struct resv_map *resv, long f, long t)
{
struct list_head *head = &resv->regions;
struct file_region *rg, *nrg, *trg;
+ long chg = 0;
spin_lock(&resv->lock);
/* Locate the region we are either in or before. */
@@ -181,14 +182,17 @@ static long region_add(struct resv_map *resv, long f, long t)
if (rg->to > t)
t = rg->to;
if (rg != nrg) {
+ chg -= (rg->to - rg->from);
list_del(&rg->link);
kfree(rg);
}
}
+ chg += (nrg->from - f);
nrg->from = f;
+ chg += t - nrg->to;
nrg->to = t;
spin_unlock(&resv->lock);
- return 0;
+ return chg;
}
static long region_chg(struct resv_map *resv, long f, long t)
@@ -1349,18 +1353,25 @@ static long vma_needs_reservation(struct hstate *h,
else
return chg < 0 ? chg : 0;
}
-static void vma_commit_reservation(struct hstate *h,
+
+static long vma_commit_reservation(struct hstate *h,
struct vm_area_struct *vma, unsigned long addr)
{
struct resv_map *resv;
pgoff_t idx;
+ long add;
resv = vma_resv_map(vma);
if (!resv)
- return;
+ return 1;
idx = vma_hugecache_offset(h, vma, addr);
- region_add(resv, idx, idx + 1);
+ add = region_add(resv, idx, idx + 1);
+
+ if (vma->vm_flags & VM_MAYSHARE)
+ return add;
+ else
+ return 0;
}
static struct page *alloc_huge_page(struct vm_area_struct *vma,
--
2.1.0
--
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