From 050f24c7964cbe65633261e431e1105d1d5e8070 Mon Sep 17 00:00:00 2001 From: Andreas Sandberg Date: Fri, 2 Nov 2012 11:32:02 -0500 Subject: sim: Add drain methods to request additional cleanup operations This patch adds the following two methods to the Drainable base class: memWriteback() - Write back all dirty cache lines to memory using functional accesses. memInvalidate() - Invalidate memory system buffers. Dirty data won't be written back. Specifying calling memWriteback() after draining will allow us to checkpoint systems with caches. memInvalidate() can be used to drop memory system buffers in preparation for switching to an accelerated CPU model that bypasses the gem5 memory system (e.g., hardware virtualized CPUs). Note: This patch only adds the methods to Drainable, the code for flushing the TLB and the cache is committed separately. --- src/python/m5/simulate.py | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'src/python') diff --git a/src/python/m5/simulate.py b/src/python/m5/simulate.py index ca2cc4a9c..8ad273225 100644 --- a/src/python/m5/simulate.py +++ b/src/python/m5/simulate.py @@ -181,6 +181,14 @@ def drain(root): while (not all_drained): all_drained = _drain() +def memWriteback(root): + for obj in root.descendants(): + obj.memWriteback() + +def memInvalidate(root): + for obj in root.descendants(): + obj.memInvalidate() + def resume(root): for obj in root.descendants(): obj.drainResume() @@ -189,6 +197,7 @@ def checkpoint(dir): if not isinstance(root, objects.Root): raise TypeError, "Checkpoint must be called on a root object." drain(root) + memWriteback(root) print "Writing checkpoint" internal.core.serializeAll(dir) resume(root) -- cgit v1.2.3