cpu: Flush TLBs on switchOut()

derek/gem5

This changeset inserts a TLB flush in BaseCPU::switchOut to prevent
stale translations when doing repeated switching. Additionally, the
TLB flushing functionality is exported to the Python to make debugging
of switching/checkpointing easier.

A simulation script will typically use the TLB flushing functionality
to generate a reference trace. The following sequence can be used to
simulate a handover (this depends on how drain is implemented, but is
generally the case) between identically configured CPU models:

  m5.drain(test_sys)
  [ cpu.flushTLBs() for cpu in test_sys.cpu ]
  m5.resume(test_sys)

The generated trace should normally be identical to a trace generated
when switching between identically configured CPU models or
checkpointing and resuming.

This commit is contained in:

Andreas Sandberg

2013-01-07 13:05:48 -05:00

parent 964aa49d15

commit e09e9fa279

4 changed files with 36 additions and 3 deletions

									
										1

src/cpu/BaseCPU.py
									
												View File
												
				@@ -96,6 +96,7 @@ class BaseCPU(MemObject):

				    void switchOut();

				    void takeOverFrom(BaseCPU *cpu);

				    bool switchedOut();

				    void flushTLBs();

				''')

				    def takeOverFrom(self, old_cpu):

cpu: Flush TLBs on switchOut()

1 src/cpu/BaseCPU.py Unescape Escape View File

1

src/cpu/BaseCPU.py

View File