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Commit b0ebea9e authored by Liam Mark's avatar Liam Mark
Browse files

mm: cma: add trace events for CMA alloc perf testing 



Add cma and migrate trace events to enable CMA allocation
performance to be measured via ftrace.

Change-Id: I1e471e9e21f1a14ce2ed167d8515ccb5f83eb88c
Signed-off-by: default avatarLiam Mark <lmark@codeaurora.org>
parent 91d62943

include/trace/events/cma.h

+39 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ 
#include <linux/types.h>

#include <linux/tracepoint.h>



TRACE_EVENT(cma_alloc,

DECLARE_EVENT_CLASS(cma_alloc_class,



	TP_PROTO(unsigned long pfn, const struct page *page,

		 unsigned int count, unsigned int align),
@@ -60,6 +60,44 @@ TRACE_EVENT(cma_release, 
		  __entry->count)

);



TRACE_EVENT(cma_alloc_start,



	TP_PROTO(unsigned int count, unsigned int align),



	TP_ARGS(count, align),



	TP_STRUCT__entry(

		__field(unsigned int, count)

		__field(unsigned int, align)

	),



	TP_fast_assign(

		__entry->count = count;

		__entry->align = align;

	),



	TP_printk("count=%u align=%u",

		  __entry->count,

		  __entry->align)

);



DEFINE_EVENT(cma_alloc_class, cma_alloc,



	TP_PROTO(unsigned long pfn, const struct page *page,

		 unsigned int count, unsigned int align),



	TP_ARGS(pfn, page, count, align)

);



DEFINE_EVENT(cma_alloc_class, cma_alloc_busy_retry,



	TP_PROTO(unsigned long pfn, const struct page *page,

		 unsigned int count, unsigned int align),



	TP_ARGS(pfn, page, count, align)

);





#endif /* _TRACE_CMA_H */



/* This part must be outside protection */

include/trace/events/migrate.h

+21 −0
Original line number Diff line number Diff line
@@ -74,6 +74,27 @@ TRACE_EVENT(mm_numa_migrate_ratelimit, 
		__entry->dst_nid,

		__entry->nr_pages)

);



TRACE_EVENT(mm_migrate_pages_start,



	TP_PROTO(enum migrate_mode mode, int reason),



	TP_ARGS(mode, reason),



	TP_STRUCT__entry(

		__field(enum migrate_mode, mode)

		__field(int, reason)

	),



	TP_fast_assign(

		__entry->mode	= mode;

		__entry->reason	= reason;

	),



	TP_printk("mode=%s reason=%s",

		__print_symbolic(__entry->mode, MIGRATE_MODE),

		__print_symbolic(__entry->reason, MIGRATE_REASON))

);

#endif /* _TRACE_MIGRATE_H */



/* This part must be outside protection */

mm/cma.c

+4 −0
Original line number Diff line number Diff line
@@ -353,6 +353,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align) 
	if (!count)

		return NULL;



	trace_cma_alloc_start(count, align);



	mask = cma_bitmap_aligned_mask(cma, align);

	bitmap_maxno = cma_bitmap_maxno(cma);

	bitmap_count = cma_bitmap_pages_to_bits(cma, count);
@@ -404,6 +406,8 @@ struct page *cma_alloc(struct cma *cma, size_t count, unsigned int align) 


		pr_debug("%s(): memory range at %p is busy, retrying\n",

			 __func__, pfn_to_page(pfn));



		trace_cma_alloc_busy_retry(pfn, pfn_to_page(pfn), count, align);

		/* try again with a bit different memory target */

		start = bitmap_no + mask + 1;

	}

mm/migrate.c

+2 −0
Original line number Diff line number Diff line
@@ -1121,6 +1121,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page, 
	int swapwrite = current->flags & PF_SWAPWRITE;

	int rc;



	trace_mm_migrate_pages_start(mode, reason);



	if (!swapwrite)

		current->flags |= PF_SWAPWRITE;