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Commit 99e8ea6c authored by Stefan Strogin's avatar Stefan Strogin Committed by Linus Torvalds
Browse files

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: default avatarStefan 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent cdd7875e

include/trace/events/cma.h

0 → 100644
+66 −0
Original line number Diff line number Diff line 
#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>

mm/cma.c

+5 −0
Original line number Diff line number Diff line
@@ -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;

}