mm: cma: add trace events for CMA allocations and freeings
Add trace events for cma_alloc() and cma_release().
The cma_alloc tracepoint is used both for successful and failed allocations,
in case of allocation failure pfn=-1UL is stored and printed.
Signed-off-by: Stefan Strogin <stefan.strogin@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Michal Nazarewicz <mpn@google.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Cc: Thierry Reding <treding@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
new file mode 100644
index 0000000..d7cd961
--- /dev/null
+++ b/include/trace/events/cma.h
@@ -0,0 +1,66 @@
+#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(unsigned long pfn, const struct page *page,
+ unsigned int count, unsigned int align),
+
+ TP_ARGS(pfn, page, count, align),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __field(const struct page *, page)
+ __field(unsigned int, count)
+ __field(unsigned int, align)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ __entry->page = page;
+ __entry->count = count;
+ __entry->align = align;
+ ),
+
+ TP_printk("pfn=%lx page=%p count=%u align=%u",
+ __entry->pfn,
+ __entry->page,
+ __entry->count,
+ __entry->align)
+);
+
+TRACE_EVENT(cma_release,
+
+ TP_PROTO(unsigned long pfn, const struct page *page,
+ unsigned int count),
+
+ TP_ARGS(pfn, page, count),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __field(const struct page *, page)
+ __field(unsigned int, count)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = pfn;
+ __entry->page = page;
+ __entry->count = count;
+ ),
+
+ TP_printk("pfn=%lx page=%p count=%u",
+ __entry->pfn,
+ __entry->page,
+ __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..3a7a67b 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 @@
start = bitmap_no + mask + 1;
}
+ trace_cma_alloc(page ? pfn : -1UL, page, count, align);
+
pr_debug("%s(): returned %p\n", __func__, page);
return page;
}
@@ -446,6 +450,7 @@
free_contig_range(pfn, count);
cma_clear_bitmap(cma, pfn, count);
+ trace_cma_release(pfn, pages, count);
return true;
}