On Wed 28-03-12 23:08:34, Aneesh Kumar K.V wrote:

Michal Hocko [off-list ref] writes:

quoted

On Fri 16-03-12 23:09:28, Aneesh Kumar K.V wrote:

quoted

From: "Aneesh Kumar K.V" <redacted>

hugepage_activelist will be used to track currently used HugeTLB pages.
We need to find the in-use HugeTLB pages to support memcg removal.
On memcg removal we update the page's memory cgroup to point to
parent cgroup.

Signed-off-by: Aneesh Kumar K.V <redacted>
---
 include/linux/hugetlb.h |    1 +
 mm/hugetlb.c            |   23 ++++++++++++++++++-----
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index cbd8dc5..6919100 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h

[...]

quoted

@@ -2319,14 +2322,24 @@ void __unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
 		page = pte_page(pte);
 		if (pte_dirty(pte))
 			set_page_dirty(page);
-		list_add(&page->lru, &page_list);
+
+		spin_lock(&hugetlb_lock);
+		list_move(&page->lru, &page_list);
+		spin_unlock(&hugetlb_lock);

Why do we really need the spinlock here?

It does a list_del from hugepage_activelist.

right you are.
sorry

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic

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