[PATCH] mm: page_alloc: add nid to mm_page_alloc tracepoint

[Ye Bin <yebin@huaweicloud.com>]

From: Ye Bin <yebin10@huawei.com>

Add the NUMA node id to the mm_page_alloc trace event so that page
allocations can be attributed to a specific node directly from the
trace, without having to look up the pfn separately.

The nid is derived from the allocated page, or set to -1 when no page
is available (e.g. failed allocations).

Signed-off-by: Ye Bin <yebin10@huawei.com>
---
 include/trace/events/kmem.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index cd7920c81f85..8bf4e992d8bb 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -189,6 +189,7 @@ TRACE_EVENT(mm_page_alloc,
 		__field(	unsigned int,	order		)
 		__field(	unsigned long,	gfp_flags	)
 		__field(	int,		migratetype	)
+		__field(	int,		nid		)
 	),
 
 	TP_fast_assign(
@@ -196,13 +197,15 @@ TRACE_EVENT(mm_page_alloc,
 		__entry->order		= order;
 		__entry->gfp_flags	= (__force unsigned long)gfp_flags;
 		__entry->migratetype	= migratetype;
+		__entry->nid		= page ? page_to_nid(page) : -1;
 	),
 
-	TP_printk("page=%p pfn=0x%lx order=%d migratetype=%d gfp_flags=%s",
+	TP_printk("page=%p pfn=0x%lx order=%d migratetype=%d nid=%d gfp_flags=%s",
 		__entry->pfn != -1UL ? pfn_to_page(__entry->pfn) : NULL,
 		__entry->pfn != -1UL ? __entry->pfn : 0,
 		__entry->order,
 		__entry->migratetype,
+		__entry->nid,
 		show_gfp_flags(__entry->gfp_flags))
 );
 
-- 
2.34.1