From a3f895be1f1ed17f66e6e71adeef0cc7f937512c Mon Sep 17 00:00:00 2001 From: Arnaldo Carvalho de Melo Date: Tue, 24 Apr 2012 14:24:28 -0300 Subject: perf annotate browser: Initial loop detection Simple algorithm, just look for the next backward jump that points to before the cursor. Then draw an arrow connecting the jump to its target. Do this as you move the cursor, entering/exiting possible loops. Ex (graph chars replaced to avoid mail encoding woes): avc_has_perm_flags 0.00 | nopl 0x0(%rax) 5.36 |+-> 68: mov (%rax),%rax 5.15 || test %rax,%rax 0.00 || v je 130 2.96 || 74: cmp -0x20(%rax),%ebx 47.38 || lea -0x20(%rax),%rcx 0.28 || ^ jne 68 3.16 || cmp -0x18(%rax),%dx 0.00 |+------^ jne 68 4.92 | cmp 0x4(%rcx),%r13d 0.00 | v jne 68 1.15 | test %rcx,%rcx 0.00 | v je 130 Suggested-by: Linus Torvalds Cc: David Ahern Cc: Frederic Weisbecker Cc: Linus Torvalds Cc: Mike Galbraith Cc: Namhyung Kim Cc: Paul Mackerras Cc: Peter Zijlstra Cc: Stephane Eranian Link: http://lkml.kernel.org/n/tip-5gairf6or7dazlx3ocxwvftm@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/ui/browser.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'tools/perf/ui/browser.h') diff --git a/tools/perf/ui/browser.h b/tools/perf/ui/browser.h index ce20975419d..2f226cb79f6 100644 --- a/tools/perf/ui/browser.h +++ b/tools/perf/ui/browser.h @@ -38,6 +38,8 @@ void ui_browser__reset_index(struct ui_browser *self); void ui_browser__gotorc(struct ui_browser *self, int y, int x); void ui_browser__write_graph(struct ui_browser *browser, int graph); +void __ui_browser__line_arrow_up(struct ui_browser *browser, unsigned int column, + u64 start, u64 end, int start_width); void __ui_browser__show_title(struct ui_browser *browser, const char *title); void ui_browser__show_title(struct ui_browser *browser, const char *title); int ui_browser__show(struct ui_browser *self, const char *title, -- cgit v1.2.3-70-g09d2