S390: Optimize allocate sequence

S390: Optimize allocate sequence

Improve the S390 allocate sequence by:
- Keeping allocation limit in memory, and leverage compare RX-instr.
- Prefetching subsequent cache lines from allocation top.
- Optimizing object tagging with LA
- Optimizing increment for Fast-Allocate with ASI/AGSI

R=jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2601563002
Cr-Commit-Position: refs/heads/master@{#41933}
Committed: https://chromium.googlesource.com/v8/v8/+/0ddb3645cc826bd443c0c9e7adf79952d133688d

[JoranSiu, 2016-12-22 20:30:17]

The CQ bit was checked by joransiu@ca.ibm.com to run a CQ dry run

[commit-bot: I haz the power, 2016-12-22 20:30:24]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[JoranSiu, 2016-12-22 20:32:27]

ptal

[JaideepBajwa, 2016-12-22 20:34:54]

lgtm

[commit-bot: I haz the power, 2016-12-22 20:55:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-12-22 20:55:51]

Dry run: This issue passed the CQ dry run.

[JoranSiu, 2016-12-22 20:57:51]

The CQ bit was checked by joransiu@ca.ibm.com

[commit-bot: I haz the power, 2016-12-22 20:58:00]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-12-22 20:59:33]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1482440271580320, "parent_rev":
"61a55548c50e01d84ed4aefa396324cbb4039b51", "commit_rev":
"0ddb3645cc826bd443c0c9e7adf79952d133688d"}

[commit-bot: I haz the power, 2016-12-22 20:59:38]

Description was changed from

==========
S390: Optimize allocate sequence

Improve the S390 allocate sequence by:
- Keeping allocation limit in memory, and leverage compare RX-instr.
- Prefetching subsequent cache lines from allocation top.
- Optimizing object tagging with LA
- Optimizing increment for Fast-Allocate with ASI/AGSI

R=jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=
==========

to

==========
S390: Optimize allocate sequence

Improve the S390 allocate sequence by:
- Keeping allocation limit in memory, and leverage compare RX-instr.
- Prefetching subsequent cache lines from allocation top.
- Optimizing object tagging with LA
- Optimizing increment for Fast-Allocate with ASI/AGSI

R=jyan@ca.ibm.com, michael_dawson@ca.ibm.com, bjaideep@ca.ibm.com
BUG=

Review-Url: https://codereview.chromium.org/2601563002
Cr-Commit-Position: refs/heads/master@{#41933}
Committed:
https://chromium.googlesource.com/v8/v8/+/0ddb3645cc826bd443c0c9e7adf79952d13...
==========

[commit-bot: I haz the power, 2016-12-22 20:59:39]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/v8/v8/+/0ddb3645cc826bd443c0c9e7adf79952d13...