diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2016-12-06 06:40:02 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2016-12-07 18:00:33 +0300 |
| commit | 571f1eb9b967a52732d2e1f41f1b62e27c900325 (patch) | |
| tree | 05b780fa0ef975f55c1695a14f3631215e4d59f2 /tools/perf/util/callchain.c | |
| parent | 6fa94258ce2673adc707b2ec5668464f2cf83ed3 (diff) | |
| download | linux-571f1eb9b967a52732d2e1f41f1b62e27c900325.tar.xz | |
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 <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: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/callchain.c')
| -rw-r--r-- | tools/perf/util/callchain.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c index 823befd8209a..42922512c1c6 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; +} |