[PATCH v4 1/5] mm: cma: add trace events to debug physically-contiguous memory allocations

[Stefan Strogin]

Add trace events for cma_alloc() and cma_release().

Signed-off-by: Stefan Strogin <stefan.strogin@xxxxxxxxx>
---
 include/trace/events/cma.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++
 mm/cma.c                   |  5 ++++
 2 files changed, 62 insertions(+)
 create mode 100644 include/trace/events/cma.h

diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
new file mode 100644
index 0000000..d88881b
--- /dev/null
+++ b/include/trace/events/cma.h
@@ -0,0 +1,57 @@
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM cma
+
+#if !defined(_TRACE_CMA_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_CMA_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+TRACE_EVENT(cma_alloc,
+
+	TP_PROTO(struct cma *cma, struct page *page, int count),
+
+	TP_ARGS(cma, page, count),
+
+	TP_STRUCT__entry(
+		__field(struct page *, page)
+		__field(unsigned long, count)
+	),
+
+	TP_fast_assign(
+		__entry->page = page;
+		__entry->count = count;
+	),
+
+	TP_printk("page=%p pfn=%lu count=%lu",
+		  __entry->page,
+		  __entry->page ? page_to_pfn(__entry->page) : 0,
+		  __entry->count)
+);
+
+TRACE_EVENT(cma_release,
+
+	TP_PROTO(struct cma *cma, unsigned long pfn, int count),
+
+	TP_ARGS(cma, pfn, count),
+
+	TP_STRUCT__entry(
+		__field(unsigned long, pfn)
+		__field(unsigned long, count)
+	),
+
+	TP_fast_assign(
+		__entry->pfn = pfn;
+		__entry->count = count;
+	),
+
+	TP_printk("pfn=%lu page=%p count=%lu",
+		  __entry->pfn,
+		  pfn_to_page(__entry->pfn),
+		  __entry->count)
+);
+
+#endif /* _TRACE_CMA_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/mm/cma.c b/mm/cma.c
index 47203fa..63dfc0e 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -23,6 +23,7 @@
 #  define DEBUG
 #endif
 #endif
+#define CREATE_TRACE_POINTS
 
 #include <linux/memblock.h>
 #include <linux/err.h>
@@ -34,6 +35,7 @@
 #include <linux/cma.h>
 #include <linux/highmem.h>
 #include <linux/io.h>
+#include <trace/events/cma.h>
 
 #include "cma.h"
 
@@ -414,6 +416,8 @@ struct page *cma_alloc(struct cma *cma, unsigned int count, unsigned int align)
 		start = bitmap_no + mask + 1;
 	}
 
+	trace_cma_alloc(cma, page, count);
+
 	pr_debug("%s(): returned %p\n", __func__, page);
 	return page;
 }
@@ -446,6 +450,7 @@ bool cma_release(struct cma *cma, const struct page *pages, unsigned int count)
 
 	free_contig_range(pfn, count);
 	cma_clear_bitmap(cma, pfn, count);
+	trace_cma_release(cma, pfn, count);
 
 	return true;
 }
-- 
2.1.0

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