[PATCH v3 1/4] mm: cma: add trace events to debug physically-contiguous memory allocations
From: Stefan Strogin <hidden>
Date: 2015-02-24 18:45:05
Also in:
lkml
Subsystem:
memory management, memory management - misc, the rest, tracing · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Add trace events for cma_alloc() and cma_release(). Signed-off-by: Stefan Strogin <redacted> --- include/trace/events/cma.h | 57 ++++++++++++++++++++++++++++++++++++++++++++++ mm/cma.c | 6 +++++ 2 files changed, 63 insertions(+) create mode 100644 include/trace/events/cma.h
diff --git a/include/trace/events/cma.h b/include/trace/events/cma.h
new file mode 100644
index 0000000..3fe7a56
--- /dev/null
+++ b/include/trace/events/cma.h@@ -0,0 +1,57 @@ +#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(struct cma *cma, unsigned long pfn, int count), + + TP_ARGS(cma, pfn, count), + + TP_STRUCT__entry( + __field(unsigned long, pfn) + __field(unsigned long, count) + ), + + TP_fast_assign( + __entry->pfn = pfn; + __entry->count = count; + ), + + TP_printk("pfn=%lu page=%p count=%lu\n", + __entry->pfn, + pfn_to_page(__entry->pfn), + __entry->count) +); + +TRACE_EVENT(cma_release, + + TP_PROTO(struct cma *cma, unsigned long pfn, int count), + + TP_ARGS(cma, pfn, count), + + TP_STRUCT__entry( + __field(unsigned long, pfn) + __field(unsigned long, count) + ), + + TP_fast_assign( + __entry->pfn = pfn; + __entry->count = count; + ), + + TP_printk("pfn=%lu page=%p count=%lu\n", + __entry->pfn, + pfn_to_page(__entry->pfn), + __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 9e3d44a..3a63c96 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"
@@ -408,6 +410,9 @@ struct page *cma_alloc(struct cma *cma, int count, unsigned int align) start = bitmap_no + mask + 1; } + if (page) + trace_cma_alloc(cma, pfn, count); + pr_debug("%s(): returned %p\n", __func__, page); return page; }
@@ -440,6 +445,7 @@ bool cma_release(struct cma *cma, struct page *pages, int count) free_contig_range(pfn, count); cma_clear_bitmap(cma, pfn, count); + trace_cma_release(cma, pfn, count); return true; }
--
2.1.0
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