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authorStefan Strogin <s.strogin@partner.samsung.com>2015-04-16 02:14:50 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-16 02:35:19 +0300
commit99e8ea6cd2210cf2271f922384b483cd83f0f8f3 (patch)
tree78a467028c10e54cf24ed0062e5abdf52b1f63b1
parentcdd7875e0c4db5c41e28b645d3bf7d41bd2cbb45 (diff)
downloadlinux-99e8ea6cd2210cf2271f922384b483cd83f0f8f3.tar.xz
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>
-rw-r--r--include/trace/events/cma.h66
-rw-r--r--mm/cma.c5
2 files changed, 71 insertions, 0 deletions
diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
new file mode 100644
index 000000000000..d7cd961720a7
--- /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 47203faaf65e..3a7a67b93394 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(page ? pfn : -1UL, page, count, align);
+
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(pfn, pages, count);
return true;
}