mm/page_cache_limit: do shrink_page_cache when adding page to page cache

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4HOXK

------------------------------------------

Add hooks in function add_to page_cache and add_to_page_cache_lru
Signed-off-by: NChen Wandun <chenwandun@huawei.com>
Reviewed-by: NKefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/linux/page_cache_limit.h

@@ -19,9 +19,11 @@ unsigned long __shrink_node_page_cache(int nid, gfp_t mask,
 		unsigned long nr_to_reclaim, enum page_cache_reclaim_flag flag);
 void kpagecache_limitd_stop(int nid);
 int kpagecache_limitd_run(int nid);
+void wakeup_all_kpagecache_limitd(void);
 #else
 static inline void kpagecache_limitd_stop(int nid) {}
 static inline int kpagecache_limitd_run(int nid) { return 0; }
+static inline void wakeup_all_kpagecache_limitd(void) {}
 #endif
 
 #endif

include/linux/pagemap.h

@@ -15,6 +15,7 @@
 #include <linux/bitops.h>
 #include <linux/hardirq.h> /* for in_interrupt() */
 #include <linux/hugetlb_inline.h>
+#include <linux/page_cache_limit.h>
 
 struct pagevec;
 
@@ -777,6 +778,7 @@ static inline int add_to_page_cache(struct page *page,
 {
 	int error;
 
+	wakeup_all_kpagecache_limitd();
 	__SetPageLocked(page);
 	error = add_to_page_cache_locked(page, mapping, offset, gfp_mask);
 	if (unlikely(error))

mm/filemap.c

@@ -42,6 +42,7 @@
 #include <linux/psi.h>
 #include <linux/ramfs.h>
 #include <linux/page_idle.h>
+#include <linux/page_cache_limit.h>
 #include "internal.h"
 
 #define CREATE_TRACE_POINTS
@@ -923,6 +924,7 @@ int add_to_page_cache_lru(struct page *page, struct address_space *mapping,
 	void *shadow = NULL;
 	int ret;
 
+	wakeup_all_kpagecache_limitd();
 	__SetPageLocked(page);
 	ret = __add_to_page_cache_locked(page, mapping, offset,
 					 gfp_mask, &shadow);