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Subject[PATCH 4/4] mm: cma: add trace events to debug physically-contiguous memory allocations
Date
Add trace events for cma_alloc() and cma_release().

Signed-off-by: Stefan Strogin <s.strogin@partner.samsung.com>
---
include/trace/events/cma.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++
mm/cma.c | 7 +++++-
2 files changed, 63 insertions(+), 1 deletion(-)
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..3fe7a56
--- /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, 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\n",
+ __entry->pfn,
+ pfn_to_page(__entry->pfn),
+ __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\n",
+ __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 c68d383..a7bd7f0 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>
@@ -37,6 +38,7 @@
#include <linux/list.h>
#include <linux/proc_fs.h>
#include <linux/time.h>
+#include <trace/events/cma.h>

#include "cma.h"

@@ -443,8 +445,10 @@ struct page *cma_alloc(struct cma *cma, int count, unsigned int align)
start = bitmap_no + mask + 1;
}

- if (page)
+ if (page) {
cma_buffer_list_add(cma, pfn, count);
+ trace_cma_alloc(cma, pfn, count);
+ }

pr_debug("%s(): returned %p\n", __func__, page);
return page;
@@ -478,6 +482,7 @@ bool cma_release(struct cma *cma, struct page *pages, int count)

free_contig_range(pfn, count);
cma_clear_bitmap(cma, pfn, count);
+ trace_cma_release(cma, pfn, count);
cma_buffer_list_del(cma, pfn, count);

return true;
--
2.1.0


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