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Subject[PATCH 04/12] mm, thp, tmpfs: split huge page when moving from page cache to swap
in shmem_writepage, we have to split the huge page when moving pages
from page cache to swap because we don't support huge page in swap
yet.

Signed-off-by: Ning Qu <quning@gmail.com>
---
mm/shmem.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/mm/shmem.c b/mm/shmem.c
index 8fe17dd..68a0e1d 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -898,6 +898,13 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
swp_entry_t swap;
pgoff_t index;

+ /* TODO: we have to break the huge page at this point,
+ * since we have no idea how to recover a huge page from
+ * swap.
+ */
+ if (PageTransCompound(page))
+ split_huge_page(compound_trans_head(page));
+
BUG_ON(!PageLocked(page));
mapping = page->mapping;
index = page->index;
@@ -946,7 +953,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc)
if (shmem_falloc)
goto redirty;
}
- clear_highpage(page);
+ clear_pagecache_page(page);
flush_dcache_page(page);
SetPageUptodate(page);
}
--
1.8.4



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