From 571f1eb9b967a52732d2e1f41f1b62e27c900325 Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Tue, 6 Dec 2016 12:40:02 +0900 Subject: [PATCH] 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: Namhyung Kim Cc: Andi Kleen Cc: David Ahern Cc: Jiri Olsa Cc: Minchan Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20161206034010.6499-3-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/callchain.c | 27 +++++++++++++++++++++++++++ tools/perf/util/callchain.h | 3 +++ 2 files changed, 30 insertions(+) diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 823befd..4292251 100644 --- a/tools/perf/util/callchain.c +++ b/tools/perf/util/callchain.c @@ -1234,3 +1234,30 @@ out: } 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; +} diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h index d9c70dc..35c8e37 100644 --- a/tools/perf/util/callchain.h +++ b/tools/perf/util/callchain.h @@ -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; -- 2.7.4