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authorChen, Kenneth W <kenneth.w.chen@intel.com>2006-03-31 02:30:01 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-31 12:18:50 -0800
commit78c997a4be7d1ed3ff4c27f23d30a0185d39bcbf (patch)
tree6ca625d590c7ec2e31acca3f2a1d28dce2e96332
parentd6692183ac1d8f4a4e4015f9ce9acc2514618e0b (diff)
downloadop-kernel-dev-78c997a4be7d1ed3ff4c27f23d30a0185d39bcbf.zip
op-kernel-dev-78c997a4be7d1ed3ff4c27f23d30a0185d39bcbf.tar.gz
[PATCH] hugetlb: don't allow free hugetlb count fall below reserved count
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>
-rw-r--r--mm/hugetlb.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index d87885e..832f676 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -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);
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