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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: Stefan 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Stefan Strogin 2015-04-15 16:14:50 -07:00 committed by Linus Torvalds
parent cdd7875e0c
commit 99e8ea6cd2
2 changed files with 71 additions and 0 deletions
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66
include/trace/events/cma.h Normal file
View File

@ -0,0 +1,66 @@
#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>

5
mm/cma.c
View File

@ -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;
}