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: Liam Mark <lmark@codeaurora.org>
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>
Signed-off-by: Sudarshan Rajagopalan <sudaraja@codeaurora.org>
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>

include/trace/events/cma.h

@@ -8,7 +8,7 @@
 #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),
@@ -61,6 +61,44 @@ 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

@@ -70,6 +70,54 @@ TRACE_EVENT(mm_migrate_pages,
 		__print_symbolic(__entry->mode, MIGRATE_MODE),
 		__print_symbolic(__entry->reason, MIGRATE_REASON))
 );
+
+TRACE_EVENT(mm_numa_migrate_ratelimit,
+
+	TP_PROTO(struct task_struct *p, int dst_nid, unsigned long nr_pages),
+
+	TP_ARGS(p, dst_nid, nr_pages),
+
+	TP_STRUCT__entry(
+		__array(char,		comm,	TASK_COMM_LEN)
+		__field(pid_t,		pid)
+		__field(int,		dst_nid)
+		__field(unsigned long,	nr_pages)
+	),
+
+	TP_fast_assign(
+		memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
+		__entry->pid		= p->pid;
+		__entry->dst_nid	= dst_nid;
+		__entry->nr_pages	= nr_pages;
+	),
+
+	TP_printk("comm=%s pid=%d dst_nid=%d nr_pages=%lu",
+		__entry->comm,
+		__entry->pid,
+		__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

@@ -436,6 +436,8 @@ 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);
 	offset = cma_bitmap_aligned_offset(cma, align);
 	bitmap_maxno = cma_bitmap_maxno(cma);
@@ -477,6 +479,8 @@ 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

@@ -1409,6 +1409,8 @@ 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;