mm: cma: add the CMA instance name to cma trace events

There were missing places to add cma instance name.  To identify each CMA
instance, let's add the name for every cma trace.  This patch also changes
the existing cma_trace_alloc to cma_trace_finish since we have
cma_alloc_start[1].

[1] https://lore.kernel.org/linux-mm/20210324160740.15901-1-georgi.djakov@linaro.org

Link: https://lkml.kernel.org/r/20210330220237.748899-1-minchan@kernel.orgSigned-off-by: NMinchan Kim <minchan@kernel.org>
Cc: Liam Mark <lmark@codeaurora.org>
Cc: Georgi Djakov <georgi.djakov@linaro.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

include/trace/events/cma.h

@@ -10,12 +10,13 @@
 
 DECLARE_EVENT_CLASS(cma_alloc_class,
 
-	TP_PROTO(unsigned long pfn, const struct page *page,
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
 		 unsigned int count, unsigned int align),
 
-	TP_ARGS(pfn, page, count, align),
+	TP_ARGS(name, pfn, page, count, align),
 
 	TP_STRUCT__entry(
+		__string(name, name)
 		__field(unsigned long, pfn)
 		__field(const struct page *, page)
 		__field(unsigned int, count)
@@ -23,13 +24,15 @@ DECLARE_EVENT_CLASS(cma_alloc_class,
 	),
 
 	TP_fast_assign(
+		__assign_str(name, name);
 		__entry->pfn = pfn;
 		__entry->page = page;
 		__entry->count = count;
 		__entry->align = align;
 	),
 
-	TP_printk("pfn=%lx page=%p count=%u align=%u",
+	TP_printk("name=%s pfn=%lx page=%p count=%u align=%u",
+		  __get_str(name),
 		  __entry->pfn,
 		  __entry->page,
 		  __entry->count,
@@ -38,24 +41,27 @@ DECLARE_EVENT_CLASS(cma_alloc_class,
 
 TRACE_EVENT(cma_release,
 
-	TP_PROTO(unsigned long pfn, const struct page *page,
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
 		 unsigned int count),
 
-	TP_ARGS(pfn, page, count),
+	TP_ARGS(name, pfn, page, count),
 
 	TP_STRUCT__entry(
+		__string(name, name)
 		__field(unsigned long, pfn)
 		__field(const struct page *, page)
 		__field(unsigned int, count)
 	),
 
 	TP_fast_assign(
+		__assign_str(name, name);
 		__entry->pfn = pfn;
 		__entry->page = page;
 		__entry->count = count;
 	),
 
-	TP_printk("pfn=%lx page=%p count=%u",
+	TP_printk("name=%s pfn=%lx page=%p count=%u",
+		  __get_str(name),
 		  __entry->pfn,
 		  __entry->page,
 		  __entry->count)
@@ -85,20 +91,20 @@ TRACE_EVENT(cma_alloc_start,
 		  __entry->align)
 );
 
-DEFINE_EVENT(cma_alloc_class, cma_alloc,
+DEFINE_EVENT(cma_alloc_class, cma_alloc_finish,
 
-	TP_PROTO(unsigned long pfn, const struct page *page,
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
 		 unsigned int count, unsigned int align),
 
-	TP_ARGS(pfn, page, count, align)
+	TP_ARGS(name, pfn, page, count, align)
 );
 
 DEFINE_EVENT(cma_alloc_class, cma_alloc_busy_retry,
 
-	TP_PROTO(unsigned long pfn, const struct page *page,
+	TP_PROTO(const char *name, unsigned long pfn, const struct page *page,
 		 unsigned int count, unsigned int align),
 
-	TP_ARGS(pfn, page, count, align)
+	TP_ARGS(name, pfn, page, count, align)
 );
 
 #endif /* _TRACE_CMA_H */

mm/cma.c

@@ -486,12 +486,13 @@ 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);
+		trace_cma_alloc_busy_retry(cma->name, pfn, pfn_to_page(pfn),
+					   count, align);
 		/* try again with a bit different memory target */
 		start = bitmap_no + mask + 1;
 	}
 
-	trace_cma_alloc(pfn, page, count, align);
+	trace_cma_alloc_finish(cma->name, pfn, page, count, align);
 
 	/*
 	 * CMA can allocate multiple page blocks, which results in different
@@ -551,7 +552,7 @@ 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);
+	trace_cma_release(cma->name, pfn, pages, count);
 
 	return true;
 }