This is a very basic possible example, demonstration the usage of
the new APIs for kernel histograms.
Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@xxxxxxxxx>
---
examples/hist.py | 66 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 66 insertions(+)
create mode 100755 examples/hist.py
diff --git a/examples/hist.py b/examples/hist.py
new file mode 100755
index 0000000..d668039
--- /dev/null
+++ b/examples/hist.py
@@ -0,0 +1,66 @@
+#!/usr/bin/env python3
+
+"""
+SPDX-License-Identifier: CC-BY-4.0
+
+Copyright 2021 VMware Inc, Yordan Karadzhov (VMware) <y.karadz@xxxxxxxxx>
+"""
+
+import sys
+import time
+
+import tracecruncher.ftracepy as ft
+
+inst_name = 'khist_example'
+
+cmds = ['start', 'stop', 'show', 'continue', 'clear', 'close']
+
+def get_hist():
+ hist = ft.hist(name='h1',
+ system='kmem',
+ event='kmalloc',
+ axes={'call_site': 'sym',
+ 'bytes_req': 'n'})
+
+ hist.add_value(value='bytes_alloc')
+ hist.sort_keys(keys=['bytes_req', 'bytes_alloc'])
+ hist.sort_key_direction(sort_key='bytes_req', direction='desc')
+
+ return hist
+
+if __name__ == "__main__":
+ if len(sys.argv) != 2:
+ sys.exit(1)
+
+ if not sys.argv[1].isdigit() and not sys.argv[1] in cmds:
+ sys.exit(1)
+
+ arg1 = sys.argv[1]
+ if arg1.isdigit() or arg1 == 'start':
+ inst = ft.create_instance(name=inst_name)
+ hist = get_hist()
+ hist.start(inst)
+
+ if arg1.isdigit():
+ time.sleep(int(arg1))
+ hist.stop(inst)
+ print(hist.read(inst))
+ hist.close(inst)
+ else:
+ ft.detach(inst)
+ else:
+ inst = ft.find_instance(name=inst_name)
+ hist = get_hist()
+
+ if arg1 == 'stop':
+ hist.stop(inst)
+ elif arg1 == 'show':
+ print(hist.read(inst))
+ elif arg1 == 'continue':
+ hist.resume(inst)
+ elif arg1 == 'clear':
+ hist.clear(inst)
+
+ if arg1 == 'close':
+ ft.attach(inst)
+ hist.close(inst)
--
2.32.0
|