linux-kernel - [PATCH] mm/cma: add available_count and total count in trace_cma_alloc

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Message-Id: <20250819032654.4345-1-gxxa03070307@gmail.com>
Date: Tue, 19 Aug 2025 11:26:54 +0800
From: Xiang Gao <gxxa03070307@...il.com>
To: akpm@...ux-foundation.org,
	david@...hat.com
Cc: lorenzo.stoakes@...cle.com,
	Liam.Howlett@...cle.com,
	vbabka@...e.cz,
	rppt@...nel.org,
	surenb@...gle.com,
	mhocko@...e.com,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	gaoxiang17 <gaoxiang17@...omi.com>
Subject: [PATCH] mm/cma: add available_count and total count in trace_cma_alloc_start

From: gaoxiang17 <gaoxiang17@...omi.com>

This makes cma info more intuitive during debugging.

Signed-off-by: gaoxiang17 <gaoxiang17@...omi.com>
---
 include/trace/events/cma.h | 17 ++++++++++++-----
 mm/cma.c                   |  2 +-
 2 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
index 383c09f583ac..fbe70008ffc7 100644
--- a/include/trace/events/cma.h
+++ b/include/trace/events/cma.h
@@ -38,25 +38,32 @@ TRACE_EVENT(cma_release,
 
 TRACE_EVENT(cma_alloc_start,
 
-	TP_PROTO(const char *name, unsigned long count, unsigned int align),
+	TP_PROTO(const char *name, unsigned long request_count, unsigned long available_count,
+		unsigned long total_count, unsigned int align),
 
-	TP_ARGS(name, count, align),
+	TP_ARGS(name, request_count, available_count, total_count, align),
 
 	TP_STRUCT__entry(
 		__string(name, name)
-		__field(unsigned long, count)
+		__field(unsigned long, request_count)
+		__field(unsigned long, available_count)
+		__field(unsigned long, total_count)
 		__field(unsigned int, align)
 	),
 
 	TP_fast_assign(
 		__assign_str(name);
-		__entry->count = count;
+		__entry->count = request_count;
+		__entry->available_count = available_count;
+		__entry->total_count = total_count;
 		__entry->align = align;
 	),
 
 	TP_printk("name=%s count=%lu align=%u",
 		  __get_str(name),
-		  __entry->count,
+		  __entry->request_count,
+		  __entry->available_count,
+		  __entry->total_count,
 		  __entry->align)
 );
 
diff --git a/mm/cma.c b/mm/cma.c
index 2ffa4befb99a..e56ec64d0567 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -864,7 +864,7 @@ static struct page *__cma_alloc(struct cma *cma, unsigned long count,
 	if (!count)
 		return page;
 
-	trace_cma_alloc_start(name, count, align);
+	trace_cma_alloc_start(name, count, cma->available_count, cma->count, align);
 
 	for (r = 0; r < cma->nranges; r++) {
 		page = NULL;
-- 
2.34.1