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mm: cma: add trace events for CMA allocations and freeings

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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 <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Michal Nazarewicz <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Laurent Pinchart <[email protected]>
Cc: Thierry Reding <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Stefan Strogin 2015-04-15 16:14:50 -07:00 • committed by Linus Torvalds
commit 99e8ea6cd2
2 changed files with 71 additions and 0 deletions
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5
mm/cma.c
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@ -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;
}