sascha/devlib
1
0
Fork 0
mirror of https://github.com/ARM-software/devlib.git synced 2025-09-01 09:31:53 +01:00
Code Issues Releases Wiki Activity

ftrace: Turn TraceCollector into a context manager

Browse Source 
This allows using an TraceCollector instance as a context manager, so
tracing will stop even if the devlib application is interrupted, or if
an exception is raised.
This commit is contained in:
Douglas RAILLARD
2018-12-03 12:31:32 +00:00
committed by Marc Bonnici
parent fbf0875357
commit 22a5945460
2 changed files with 16 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
doc/overview.rst
View File

@@ -323,17 +323,14 @@ You can collected traces (currently, just ftrace) using
# the buffer size to be used.
trace = FtraceCollector(t, events=['power*'], buffer_size=40000)
# clear ftrace buffer
trace.reset()
# start trace collection
trace.start()
# Perform the operations you want to trace here...
import time; time.sleep(5)
# stop trace collection
trace.stop()
# As a context manager, clear ftrace buffer using trace.reset(),
# start trace collection using trace.start(), then stop it Using
# trace.stop(). Using a context manager brings the guarantee that
# tracing will stop even if an exception occurs, including
# KeyboardInterrupt (ctr-C) and SystemExit (sys.exit)
with trace:
# Perform the operations you want to trace here...
import time; time.sleep(5)
# extract the trace file from the target into a local file
trace.get_trace('/tmp/trace.bin')