perf top: Add callgraph support

Just like in 'perf report', but live.

Still needs to decay the callchains, but already somewhat useful as-is.

Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-cj3rmaf5jpsvi3v0tf7t4uvp@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt
index d146ba33d691..e2e5cd0023cd 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -126,6 +126,21 @@ Default is to monitor all CPUS.
 --symbols::
         Only consider these symbols.
 
+-G [type,min,order]::
+--call-graph::
+        Display call chains using type, min percent threshold and order.
+        type can be either:
+        - flat: single column, linear exposure of call chains.
+        - graph: use a graph tree, displaying absolute overhead rates.
+        - fractal: like graph, but displays relative rates. Each branch of
+                 the tree is considered as a new profiled object.
+
+        order can be either:
+        - callee: callee based call graph.
+        - caller: inverted caller based call graph.
+
+        Default: fractal,0.5,callee.
+
 INTERACTIVE PROMPTING KEYS
 --------------------------