Hello Alexey Serbin, Kudu Jenkins,

I'd like you to reexamine a change.  Please visit

    http://gerrit.cloudera.org:8080/3496

to look at the new patch set (#5).

Change subject: locks: add new read-write mutex
......................................................................

locks: add new read-write mutex

The new mutex is a thin wrapper around pthread read/write locks. It has no
features of which to speak: no debugging hooks, no optimizations, nothing.

Take these rwlock-perf results with a grain of salt; they only test
read/read contention, not read/write or write/write contention. The values
are millions of cycles.

num_threads laptop_old laptop_new ve0518_old ve0518_new
-------------------------------------------------------
1           261        83         189        82
2           1604       644        914        730
3           1504       917        2204       1567
4           2398       1792       3185       2162
5           3210       2179       3943       2308
6           4070       2696       4135       2515
7           4741       3253       4557       2732
8           5457       3853       5114       3145

Change-Id: I5462e69291fb9498ebd4aaa1728c64658667aa4b
---
M src/kudu/experiments/rwlock-perf.cc
M src/kudu/util/CMakeLists.txt
M src/kudu/util/mutex.cc
A src/kudu/util/rw_mutex.cc
A src/kudu/util/rw_mutex.h
5 files changed, 122 insertions(+), 5 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/kudu refs/changes/96/3496/5
-- 
To view, visit http://gerrit.cloudera.org:8080/3496
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I5462e69291fb9498ebd4aaa1728c64658667aa4b
Gerrit-PatchSet: 5
Gerrit-Project: kudu
Gerrit-Branch: master
Gerrit-Owner: Adar Dembo <a...@cloudera.com>
Gerrit-Reviewer: Adar Dembo <a...@cloudera.com>
Gerrit-Reviewer: Alexey Serbin <aser...@cloudera.com>
Gerrit-Reviewer: Dan Burkert <d...@cloudera.com>
Gerrit-Reviewer: Kudu Jenkins
Gerrit-Reviewer: Todd Lipcon <t...@apache.org>

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