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[PATCH] hugetlb: don't allow free hugetlb count fall below reserved count

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With strict page reservation, I think kernel should enforce number of free
hugetlb page don't fall below reserved count.  Currently it is possible in
the sysctl path.  Add proper check in sysctl to disallow that.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Chen, Kenneth W 2006-03-31 02:30:01 -08:00 committed by Linus Torvalds
parent d6692183ac
commit 78c997a4be
1 changed files with 1 additions and 0 deletions
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mm/hugetlb.c
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@ -334,6 +334,7 @@ static unsigned long set_max_huge_pages(unsigned long count)
return nr_huge_pages;
spin_lock(&hugetlb_lock);
count = max(count, reserved_huge_pages);
try_to_free_low(count);
while (count < nr_huge_pages) {
struct page *page = dequeue_huge_page(NULL, 0);