[PATCH 3/8] mm: implement page cache limit feature

[Xishi Qiu]

Add hooks when a page is added to page cache.

Signed-off-by: Xishi Qiu <qiuxishi@xxxxxxxxxx>
---
 mm/filemap.c |    3 +++
 mm/hugetlb.c |    3 +++
 mm/vmscan.c  |    3 +++
 3 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 088358c..0e71a04 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -622,6 +622,9 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
 	void *shadow = NULL;
 	int ret;
 
+	if (vm_cache_limit_mbytes && page_cache_over_limit())
+		shrink_page_cache(gfp_mask);
+
 	__set_page_locked(page);
 	ret = __add_to_page_cache_locked(page, mapping, offset,
 					 gfp_mask, &shadow);
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index c82290b..4dc8173 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2851,6 +2851,9 @@ retry:
 			int err;
 			struct inode *inode = mapping->host;
 
+			if (vm_cache_limit_mbytes && page_cache_over_limit())
+				shrink_page_cache(GFP_KERNEL);
+
 			err = add_to_page_cache(page, mapping, idx, GFP_KERNEL);
 			if (err) {
 				put_page(page);
diff --git a/mm/vmscan.c b/mm/vmscan.c
index ad01ff4..707d3e3 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2977,6 +2977,9 @@ static unsigned long balance_pgdat(pg_data_t *pgdat, int order,
 	};
 	count_vm_event(PAGEOUTRUN);
 
+	if (vm_cache_limit_mbytes && page_cache_over_limit())
+		shrink_page_cache(GFP_KERNEL);
+
 	do {
 		unsigned long lru_pages = 0;
 		unsigned long nr_attempted = 0;
-- 
1.6.0.2


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