gem5/src/mem/cache
Andreas Sandberg f16c0a4a90 sim: Decouple draining from the SimObject hierarchy
Draining is currently done by traversing the SimObject graph and
calling drain()/drainResume() on the SimObjects. This is not ideal
when non-SimObjects (e.g., ports) need draining since this means that
SimObjects owning those objects need to be aware of this.

This changeset moves the responsibility for finding objects that need
draining from SimObjects and the Python-side of the simulator to the
DrainManager. The DrainManager now maintains a set of all objects that
need draining. To reduce the overhead in classes owning non-SimObjects
that need draining, objects inheriting from Drainable now
automatically register with the DrainManager. If such an object is
destroyed, it is automatically unregistered. This means that drain()
and drainResume() should never be called directly on a Drainable
object.

While implementing the new functionality, the DrainManager has now
been made thread safe. In practice, this means that it takes a lock
whenever it manipulates the set of Drainable objects since SimObjects
in different threads may create Drainable objects
dynamically. Similarly, the drain counter is now an atomic_uint, which
ensures that it is manipulated correctly when objects signal that they
are done draining.

A nice side effect of these changes is that it makes the drain state
changes stricter, which the simulation scripts can exploit to avoid
redundant drains.
2015-07-07 09:51:05 +01:00
..
prefetch mem: Add clean evicts to improve snoop filter tracking 2015-07-03 10:14:37 -04:00
tags mem: Remove templates in cache model 2015-05-05 03:22:21 -04:00
base.cc sim: Decouple draining from the SimObject hierarchy 2015-07-07 09:51:05 +01:00
base.hh sim: Decouple draining from the SimObject hierarchy 2015-07-07 09:51:05 +01:00
BaseCache.py mem: Remove redundant is_top_level cache parameter 2015-07-03 10:14:43 -04:00
blk.cc mem: Add support for a security bit in the memory system 2014-01-24 15:29:30 -06:00
blk.hh mem: Remove templates in cache model 2015-05-05 03:22:21 -04:00
cache.cc mem: Remove templates in cache model 2015-05-05 03:22:21 -04:00
cache.hh sim: Refactor the serialization base class 2015-07-07 09:51:03 +01:00
cache_impl.hh sim: Refactor the serialization base class 2015-07-07 09:51:03 +01:00
mshr.cc mem: Snoop into caches on uncacheable accesses 2015-05-05 03:22:29 -04:00
mshr.hh mem: Modernise MSHR iterators to C++11 2015-03-27 04:55:57 -04:00
mshr_queue.cc sim: Make the drain state a global typed enum 2015-07-07 09:51:04 +01:00
mshr_queue.hh mem: Align all MSHR entries to block boundaries 2015-03-27 04:55:55 -04:00
SConscript arch: Resurrect the NOISA build target and rename it NULL 2013-09-04 13:22:57 -04:00