tree 4fc16fd95d0f16d4300cbe961765a2dcccd418ff
parent f265872ab865a8cb6a423b0be8e6db019d87267d
author Steven Moreland <smoreland@google.com> 1556672205 -0700
committer android-build-team Robot <android-build-team-robot@google.com> 1557809906 +0000

Zero-initialize hidl_vec data

Bug: 131356202
Test: manually check padding in structs allocated in these arrays
Test: libhwbinder_benchmark, well within variance (this test allocates
    arrays).

Before:
---------------------------------------------------------------------
Benchmark                           Time             CPU   Iterations
---------------------------------------------------------------------
BM_sendVec_binderize/4          34935 ns        15081 ns        36091
BM_sendVec_binderize/8          39140 ns        16846 ns        38865
BM_sendVec_binderize/16         36495 ns        15833 ns        44182
BM_sendVec_binderize/32         39785 ns        17182 ns        38870
BM_sendVec_binderize/64         35647 ns        15466 ns        38215
BM_sendVec_binderize/128        39145 ns        16873 ns        44856
BM_sendVec_binderize/256        38836 ns        16801 ns        41596
BM_sendVec_binderize/512        41014 ns        17831 ns        40161
BM_sendVec_binderize/1024       37534 ns        16270 ns        41794
BM_sendVec_binderize/2048       37662 ns        16471 ns        42331
BM_sendVec_binderize/4096       38551 ns        16809 ns        35635
BM_sendVec_binderize/8192       36139 ns        15865 ns        42185
BM_sendVec_binderize/16384      51743 ns        22600 ns        31556
BM_sendVec_binderize/32768      46644 ns        20616 ns        30220
BM_sendVec_binderize/65536      68763 ns        30412 ns        25429

After:
---------------------------------------------------------------------
Benchmark                           Time             CPU   Iterations
---------------------------------------------------------------------
BM_sendVec_binderize/4          39549 ns        17214 ns        35193
BM_sendVec_binderize/8          38786 ns        16822 ns        37402
BM_sendVec_binderize/16         37787 ns        16492 ns        37100
BM_sendVec_binderize/32         40796 ns        17567 ns        36399
BM_sendVec_binderize/64         41024 ns        17797 ns        45328
BM_sendVec_binderize/128        36169 ns        15707 ns        39602
BM_sendVec_binderize/256        37136 ns        16094 ns        47081
BM_sendVec_binderize/512        37998 ns        16443 ns        48487
BM_sendVec_binderize/1024       35190 ns        15318 ns        40091
BM_sendVec_binderize/2048       37665 ns        16399 ns        39498
BM_sendVec_binderize/4096       45963 ns        19877 ns        36884
BM_sendVec_binderize/8192       40075 ns        17620 ns        34013
BM_sendVec_binderize/16384      46224 ns        20315 ns        34384
BM_sendVec_binderize/32768      49775 ns        21994 ns        35334
BM_sendVec_binderize/65536      60181 ns        27238 ns        22205

Change-Id: Ica6c55e7346b9e1ba91192472e2b229cb786802c
Merged-In: Ica6c55e7346b9e1ba91192472e2b229cb786802c
(cherry picked from commit 03b0bf2f20bccc3d6c005c41a866fc35a68458d5)