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Commit 571f1eb9 authored by Namhyung Kim's avatar Namhyung Kim Committed by Arnaldo Carvalho de Melo
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perf callchain: Introduce callchain_cursor__copy() 



The callchain_cursor__copy() function is to save current callchain
captured by a cursor.  It'll be used to keep callchains when switching
to idle task for each cpu.

Signed-off-by: default avatarNamhyung Kim <namhyung@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161206034010.6499-3-namhyung@kernel.org


Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent 6fa94258

tools/perf/util/callchain.c

+27 −0
Original line number Diff line number Diff line
@@ -1234,3 +1234,30 @@ int callchain_node__make_parent_list(struct callchain_node *node) 
	}

	return -ENOMEM;

}



int callchain_cursor__copy(struct callchain_cursor *dst,

			   struct callchain_cursor *src)

{

	int rc = 0;



	callchain_cursor_reset(dst);

	callchain_cursor_commit(src);



	while (true) {

		struct callchain_cursor_node *node;



		node = callchain_cursor_current(src);

		if (node == NULL)

			break;



		rc = callchain_cursor_append(dst, node->ip, node->map, node->sym,

					     node->branch, &node->branch_flags,

					     node->nr_loop_iter, node->samples);

		if (rc)

			break;



		callchain_cursor_advance(src);

	}



	return rc;

}

tools/perf/util/callchain.h

+3 −0
Original line number Diff line number Diff line
@@ -216,6 +216,9 @@ static inline void callchain_cursor_advance(struct callchain_cursor *cursor) 
	cursor->pos++;

}



int callchain_cursor__copy(struct callchain_cursor *dst,

			   struct callchain_cursor *src);



struct option;

struct hist_entry;