[PATCHv8 03/14] mm: Report unaccepted memory in meminfo

["Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>]

Track amount of unaccepted memory and report it in /proc/meminfo and in
node meminfo.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
---
 drivers/base/node.c    | 7 +++++++
 fs/proc/meminfo.c      | 5 +++++
 include/linux/mmzone.h | 3 +++
 mm/page_alloc.c        | 2 ++
 mm/vmstat.c            | 1 +
 5 files changed, 18 insertions(+)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index faf3597a96da..ca6f0590be21 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -448,6 +448,9 @@ static ssize_t node_read_meminfo(struct device *dev,
 			     "Node %d ShmemPmdMapped: %8lu kB\n"
 			     "Node %d FileHugePages: %8lu kB\n"
 			     "Node %d FilePmdMapped: %8lu kB\n"
+#endif
+#ifdef CONFIG_UNACCEPTED_MEMORY
+			     "Node %d Unaccepted:     %8lu kB\n"
 #endif
 			     ,
 			     nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
@@ -477,6 +480,10 @@ static ssize_t node_read_meminfo(struct device *dev,
 			     nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)),
 			     nid, K(node_page_state(pgdat, NR_FILE_THPS)),
 			     nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED))
+#endif
+#ifdef CONFIG_UNACCEPTED_MEMORY
+			     ,
+			     nid, K(node_page_state(pgdat, NR_UNACCEPTED))
 #endif
 			    );
 	len += hugetlb_report_node_meminfo(buf, len, nid);
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 440960110a42..789b77c7b6df 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -155,6 +155,11 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		    global_zone_page_state(NR_FREE_CMA_PAGES));
 #endif
 
+#ifdef CONFIG_UNACCEPTED_MEMORY
+	show_val_kb(m, "Unaccepted:     ",
+		    global_node_page_state(NR_UNACCEPTED));
+#endif
+
 	hugetlb_report_meminfo(m);
 
 	arch_report_meminfo(m);
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index da335381e63f..9c762e8175fc 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -198,6 +198,9 @@ enum node_stat_item {
 	NR_FOLL_PIN_ACQUIRED,	/* via: pin_user_page(), gup flag: FOLL_PIN */
 	NR_FOLL_PIN_RELEASED,	/* pages returned via unpin_user_page() */
 	NR_KERNEL_STACK_KB,	/* measured in KiB */
+#ifdef CONFIG_UNACCEPTED_MEMORY
+	NR_UNACCEPTED,
+#endif
 #if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
 	NR_KERNEL_SCS_KB,	/* measured in KiB */
 #endif
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6d597e833a73..e80e8d398863 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1779,6 +1779,7 @@ static bool try_to_accept_memory(struct zone *zone)
 
 	migratetype = get_pfnblock_migratetype(page, page_to_pfn(page));
 	__mod_zone_freepage_state(zone, -1 << order, migratetype);
+	__mod_node_page_state(page_pgdat(page), NR_UNACCEPTED, -1 << order);
 	spin_unlock_irqrestore(&zone->lock, flags);
 
 	if (last)
@@ -1807,6 +1808,7 @@ static void __free_unaccepted(struct page *page, unsigned int order)
 	migratetype = get_pfnblock_migratetype(page, page_to_pfn(page));
 	list_add_tail(&page->lru, &zone->unaccepted_pages);
 	__mod_zone_freepage_state(zone, 1 << order, migratetype);
+	__mod_node_page_state(page_pgdat(page), NR_UNACCEPTED, 1 << order);
 	spin_unlock_irqrestore(&zone->lock, flags);
 
 	if (first)
diff --git a/mm/vmstat.c b/mm/vmstat.c
index b2371d745e00..fb15213be374 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1230,6 +1230,7 @@ const char * const vmstat_text[] = {
 	"nr_foll_pin_acquired",
 	"nr_foll_pin_released",
 	"nr_kernel_stack",
+	"nr_unaccepted",
 #if IS_ENABLED(CONFIG_SHADOW_CALL_STACK)
 	"nr_shadow_call_stack",
 #endif
-- 
2.38.0