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perf callchain: Introduce callchain_cursor__copy()

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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>
This commit is contained in:
Namhyung Kim 2016-12-06 12:40:02 +09:00 committed by Arnaldo Carvalho de Melo
parent 6fa94258ce
commit 571f1eb9b9
2 changed files with 30 additions and 0 deletions
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27
tools/perf/util/callchain.c
View File

@ -1234,3 +1234,30 @@ out:
} }
return -ENOMEM; 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;
}

3
tools/perf/util/callchain.h
View File

@ -216,6 +216,9 @@ static inline void callchain_cursor_advance(struct callchain_cursor *cursor)
cursor->pos++; cursor->pos++;
} }
int callchain_cursor__copy(struct callchain_cursor *dst,
struct callchain_cursor *src);
struct option; struct option;
struct hist_entry; struct hist_entry;