LU-12461 contrib: Add epython scripts for crash dump analysis

[fs/lustre-release.git] / contrib / debug_tools / epython_scripts / crashlib / time.py

diff --git a/contrib/debug_tools/epython_scripts/crashlib/time.py b/contrib/debug_tools/epython_scripts/crashlib/time.py
new file mode 100644 (file)
index 0000000..e276591
--- /dev/null
+++ b/contrib/debug_tools/epython_scripts/crashlib/time.py
@@ -0,0 +1,42 @@
+"""
+Routines for retrieving and manipulating kernel time
+Copyright 2017 Cray Inc.  All Rights Reserved
+"""
+
+from pykdump.API import readSymbol, symbol_exists
+from crashlib.exceptions import *
+
+# --------------------------------------------------------------------------
+# get_wallclock_seconds()
+#
+# There are multiple variants, depending on kernel version.  Attempt to
+# discern the proper method for retrieving the current wall clock time.
+#
+
+if symbol_exists('xtime'):
+    # SLES 11 uses struct timespec xtime to hold the wall time.
+    _wallclock_xtime = readSymbol('xtime')
+    def get_wallclock_seconds():
+        '''Return current time in seconds'''
+        return _wallclock_xtime.tv_sec
+
+elif symbol_exists('timekeeper'):
+    # SLES 12 has a new timekeeper struct for that purpose
+    _wallclock_timekeeper = readSymbol('timekeeper')
+    def get_wallclock_seconds():
+        '''Return current time in seconds'''
+        return _wallclock_timekeeper.xtime_sec
+
+elif symbol_exists('tk_core'):
+    # SLES 12 SP2 embeds the timekeeper struct in tk_core
+    _wallclock_tk_core = readSymbol('tk_core')
+    def get_wallclock_seconds():
+        '''Return current time in seconds'''
+        return _wallclock_tk_core.timekeeper.xtime_sec
+
+else:
+    # Unknown how to read wallclock time in this kernel
+    def get_wallclock_seconds():
+        raise CompatibilityError('Could not find wallclock time in the kernel')
+
+# --------------------------------------------------------------------------