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authorMike Kravetz <mike.kravetz@oracle.com>2018-10-26 15:10:58 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-11-13 11:16:57 -0800
commitcbf05aa91c12d392da5db3f9f7de74c5a2af23f6 (patch)
tree9d0984d8a9c4964d762d9619fb5d13a9cf158161 /mm
parent53de32d0417ce8eee809283e9f8e9f2c5fc1ce60 (diff)
hugetlbfs: dirty pages as they are added to pagecache
commit 22146c3ce98962436e401f7b7016a6f664c9ffb5 upstream. Some test systems were experiencing negative huge page reserve counts and incorrect file block counts. This was traced to /proc/sys/vm/drop_caches removing clean pages from hugetlbfs file pagecaches. When non-hugetlbfs explicit code removes the pages, the appropriate accounting is not performed. This can be recreated as follows: fallocate -l 2M /dev/hugepages/foo echo 1 > /proc/sys/vm/drop_caches fallocate -l 2M /dev/hugepages/foo grep -i huge /proc/meminfo AnonHugePages: 0 kB ShmemHugePages: 0 kB HugePages_Total: 2048 HugePages_Free: 2047 HugePages_Rsvd: 18446744073709551615 HugePages_Surp: 0 Hugepagesize: 2048 kB Hugetlb: 4194304 kB ls -lsh /dev/hugepages/foo 4.0M -rw-r--r--. 1 root root 2.0M Oct 17 20:05 /dev/hugepages/foo To address this issue, dirty pages as they are added to pagecache. This can easily be reproduced with fallocate as shown above. Read faulted pages will eventually end up being marked dirty. But there is a window where they are clean and could be impacted by code such as drop_caches. So, just dirty them all as they are added to the pagecache. Link: http://lkml.kernel.org/r/b5be45b8-5afe-56cd-9482-28384699a049@oracle.com Fixes: 6bda666a03f0 ("hugepages: fold find_or_alloc_pages into huge_no_page()") Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Mihcla Hocko <mhocko@suse.com> Reviewed-by: Khalid Aziz <khalid.aziz@oracle.com> Cc: Hugh Dickins <hughd@google.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f9e735537c37..9c566e4b06ce 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -3645,6 +3645,12 @@ int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
return err;
ClearPagePrivate(page);
+ /*
+ * set page dirty so that it will not be removed from cache/file
+ * by non-hugetlbfs specific code paths.
+ */
+ set_page_dirty(page);
+
spin_lock(&inode->i_lock);
inode->i_blocks += blocks_per_huge_page(h);
spin_unlock(&inode->i_lock);