mm: add "ReliableFileCache" item in /proc/meminfo

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I4SK3S
CVE: NA

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

Add statistics for usage of reliable page cache, Item "ReliableFileCache"
in /proc/meminfo show the usage of reliable page cache.
Signed-off-by: NChen Wandun <chenwandun@huawei.com>
Reviewed-by: NXie XiuQi <xiexiuqi@huawei.com>
Reviewed-by: Kefeng Wang<wangkefeng.wang@huawei.com>
Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>

include/linux/mem_reliable.h

@@ -39,6 +39,9 @@ extern void mem_reliable_out_of_memory(gfp_t gfp_mask, unsigned int order,
 				       int preferred_nid, nodemask_t *nodemask);
 extern bool mem_reliable_status(void);
 
+extern void page_cache_reliable_lru_add(enum lru_list lru, struct page *page,
+					int val);
+
 static inline bool mem_reliable_is_enabled(void)
 {
 	return static_branch_likely(&mem_reliable);
@@ -169,6 +172,9 @@ static inline bool mem_reliable_status(void) { return false; }
 static inline void mem_reliable_buddy_counter(struct page *page, int nr_page) {}
 static inline bool mem_reliable_watermark_ok(int nr_page) { return true; }
 static inline bool mem_reliable_shmem_limit_check(void) { return true; }
+static inline void page_cache_reliable_lru_add(enum lru_list lru,
+					       struct page *page,
+					       int val) {}
 #endif
 
 #endif

include/linux/mm_inline.h

@@ -4,6 +4,7 @@
 
 #include <linux/huge_mm.h>
 #include <linux/swap.h>
+#include <linux/mem_reliable.h>
 
 /**
  * page_is_file_cache - should the page be on a file LRU or anon LRU?
@@ -49,6 +50,8 @@ static __always_inline void add_page_to_lru_list(struct page *page,
 {
 	update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
 	list_add(&page->lru, &lruvec->lists[lru]);
+	page_cache_reliable_lru_add(lru, page, hpage_nr_pages(page));
+
 }
 
 static __always_inline void add_page_to_lru_list_tail(struct page *page,
@@ -56,6 +59,7 @@ static __always_inline void add_page_to_lru_list_tail(struct page *page,
 {
 	update_lru_size(lruvec, lru, page_zonenum(page), hpage_nr_pages(page));
 	list_add_tail(&page->lru, &lruvec->lists[lru]);
+	page_cache_reliable_lru_add(lru, page, hpage_nr_pages(page));
 }
 
 static __always_inline void del_page_from_lru_list(struct page *page,
@@ -63,6 +67,7 @@ static __always_inline void del_page_from_lru_list(struct page *page,
 {
 	list_del(&page->lru);
 	update_lru_size(lruvec, lru, page_zonenum(page), -hpage_nr_pages(page));
+	page_cache_reliable_lru_add(lru, page, -hpage_nr_pages(page));
 }
 
 /**

mm/mem_reliable.c

@@ -36,7 +36,7 @@ long shmem_reliable_nr_page = LONG_MAX;
 
 bool pagecache_use_reliable_mem __read_mostly = true;
 atomic_long_t page_cache_fallback = ATOMIC_LONG_INIT(0);
-
+DEFINE_PER_CPU(long, pagecache_reliable_pages);
 bool mem_reliable_status(void)
 {
 	return mem_reliable_is_enabled();
@@ -66,6 +66,25 @@ static bool is_fallback_page(gfp_t gfp, struct page *page)
 	return ret;
 }
 
+static bool reliable_and_lru_check(enum lru_list lru, struct page *page)
+{
+	if (!page || !page_reliable(page))
+		return false;
+
+	if (lru != LRU_ACTIVE_FILE && lru != LRU_INACTIVE_FILE)
+		return false;
+
+	return true;
+}
+
+void page_cache_reliable_lru_add(enum lru_list lru, struct page *page, int val)
+{
+	if (!reliable_and_lru_check(lru, page))
+		return;
+
+	this_cpu_add(pagecache_reliable_pages, val);
+}
+
 void page_cache_fallback_inc(gfp_t gfp, struct page *page)
 {
 	long num;
@@ -196,6 +215,7 @@ void reliable_report_meminfo(struct seq_file *m)
 
 		if (pagecache_reliable_is_enabled()) {
 			unsigned long num = 0;
+			int cpu;
 
 			num += global_node_page_state(NR_LRU_BASE +
 						      LRU_ACTIVE_FILE);
@@ -203,6 +223,13 @@ void reliable_report_meminfo(struct seq_file *m)
 						      LRU_INACTIVE_FILE);
 			seq_printf(m, "FileCache:        %8lu kB\n",
 					num << (PAGE_SHIFT - 10));
+
+			num = 0;
+			for_each_possible_cpu(cpu)
+				num += per_cpu(pagecache_reliable_pages, cpu);
+
+			seq_printf(m, "ReliableFileCache:%8lu kB\n",
+					num << (PAGE_SHIFT - 10));
 		}
 	}
 }

mm/vmscan.c

@@ -4596,6 +4596,7 @@ static int add_page_for_reclaim_swapcache(struct page *page,
 	case 0:
 		list_move(&head->lru, pagelist);
 		update_lru_size(lruvec, lru, page_zonenum(head), -hpage_nr_pages(head));
+		page_cache_reliable_lru_add(lru, head, -hpage_nr_pages(head));
 		break;
 	case -EBUSY:
 		list_move(&head->lru, src);