Remove lazy sweeping.

Remove lazy sweeping.

BUG=
R=mstarzinger@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=20966

[Michael Starzinger, 2014-04-25 07:57:14]

LGTM with one real issue and a couple of nits.

https://codereview.chromium.org/254603002/diff/20001/src/spaces.cc
File src/spaces.cc (right):

https://codereview.chromium.org/254603002/diff/20001/src/spaces.cc#newcode2613
src/spaces.cc:2613: if (object != NULL) return object;
As discussed offline: We should stick with the old allocation strategy for now.
Moving from lazy sweeping to concurrent sweeping still doesn't guarantee that
there is one contiguous chunk large enough to hold a "size_in_bytes" object.
Let's bring the old strategy back.

https://codereview.chromium.org/254603002/diff/20001/src/spaces.cc#newcode2628
src/spaces.cc:2628: 
As discussed offline: Likewise for the last-ditch attempt.

https://codereview.chromium.org/254603002/diff/20001/test/cctest/test-heap.cc
File test/cctest/test-heap.cc (right):

https://codereview.chromium.org/254603002/diff/20001/test/cctest/test-heap.cc...
test/cctest/test-heap.cc:1618: //  subsequent GC runs.
nit: Indentation is off.

https://codereview.chromium.org/254603002/diff/20001/test/cctest/test-heap.cc...
test/cctest/test-heap.cc:1636: if (collector->IsConcurrentSweepingInProgress())
{
Can we preserve a comment along the lines of "Waiting for concurrent sweeper
threads should no change heap size." here?

[Hannes Payer (out of office), 2014-04-25 09:40:53]

https://codereview.chromium.org/254603002/diff/20001/src/spaces.cc
File src/spaces.cc (right):

https://codereview.chromium.org/254603002/diff/20001/src/spaces.cc#newcode2613
src/spaces.cc:2613: if (object != NULL) return object;
On 2014/04/25 07:57:14, Michael Starzinger wrote:
> As discussed offline: We should stick with the old allocation strategy for
now.
> Moving from lazy sweeping to concurrent sweeping still doesn't guarantee that
> there is one contiguous chunk large enough to hold a "size_in_bytes" object.
> Let's bring the old strategy back.

Done.

https://codereview.chromium.org/254603002/diff/20001/src/spaces.cc#newcode2628
src/spaces.cc:2628: 
On 2014/04/25 07:57:14, Michael Starzinger wrote:
> As discussed offline: Likewise for the last-ditch attempt.

Done. The last ditch is different now, it will wait for the sweeper threads.

https://codereview.chromium.org/254603002/diff/20001/test/cctest/test-heap.cc
File test/cctest/test-heap.cc (right):

https://codereview.chromium.org/254603002/diff/20001/test/cctest/test-heap.cc...
test/cctest/test-heap.cc:1618: //  subsequent GC runs.
On 2014/04/25 07:57:14, Michael Starzinger wrote:
> nit: Indentation is off.

Done.

https://codereview.chromium.org/254603002/diff/20001/test/cctest/test-heap.cc...
test/cctest/test-heap.cc:1636: if (collector->IsConcurrentSweepingInProgress())
{
On 2014/04/25 07:57:14, Michael Starzinger wrote:
> Can we preserve a comment along the lines of "Waiting for concurrent sweeper
> threads should no change heap size." here?

Done.

[Hannes Payer (out of office), 2014-04-25 09:51:27]

Committed patchset #5 manually as r20966 (presubmit successful).