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ofrobots f583661784 [heap] make inline allocation step size dynamic 
Presently the inline allocation step is a static value defined to be the minimum
of the step sizes over all the observers. The step occur every (approx.) step
byte. This is unfair to observers whose steps are not evenly divisible by the
min step size. For example, consider two observers with steps sizes of 512 and
576 bytes. Across 16kb allocated, you would expect the first observer to be hit
approximately 32 times, and the second observer to be hit approximately 28
times.

In reality, the observers get notified 30 and 15 times respectively. The reason
is that each step is 512 bytes, and since 576 is not evenly divisible by 512,
it gets notified much less frequently.

This CL fixes the problem by making the next step size be the minimum (over all
observers) of the remaining bytes to get to the step, making the steps fair.

BUG=
R=hpayer@chromium.org,ulan@chromium.org

Review URL: https://codereview.chromium.org/1427973006

Cr-Commit-Position: refs/heads/master@{#31948}
2015-11-11 20:55:48 +00:00
benchmarks Revert "Refactoring: Make gtest testsuite the default." 2014-09-02 09:17:26 +00:00
build make v8_use_snapshot configurable in gn 2015-11-11 01:09:15 +00:00
docs [Docs] Make it more clear that a issue on the issue tracker is needed 2015-10-26 09:16:23 +00:00
include Revert changes introduced in http://crrev.com/1367953002. 2015-11-10 21:00:18 +00:00
infra Use committer list from chrome-infra-auth group project-v8-committers 2015-08-27 16:10:22 +00:00
samples Fix crash in shell.cc when reporting exceptions that aren't Errors 2015-10-20 14:33:52 +00:00
src [heap] make inline allocation step size dynamic 2015-11-11 20:55:48 +00:00
test [heap] make inline allocation step size dynamic 2015-11-11 20:55:48 +00:00
testing Converted V8 CQ config to proto-format 2015-05-28 15:02:53 +00:00
third_party/binutils Update binutils version. 2015-08-07 08:09:49 +00:00
tools This commit adds some postmortem data that is otherwise unavailable. 2015-11-11 19:13:52 +00:00
.clang-format Change clang-format config to allow for two empty lines between functions 2013-12-03 10:39:21 +00:00
.gitignore Use msvs toolchain from depot_tools. 2015-11-02 10:40:28 +00:00
.ycm_extra_conf.py [ycm] The YouCompleteMe configuration is not VIM specific. 2015-02-12 07:21:13 +00:00
AUTHORS Add ARMv8-A to the supporting list of arm platforms 2015-10-30 14:17:20 +00:00
BUILD.gn make v8_use_snapshot configurable in gn 2015-11-11 01:09:15 +00:00
ChangeLog Update change log to match roll branch. 2015-05-18 15:03:50 +00:00
codereview.settings Use v8-reviews@ for review mail, so v8-dev@ is free for dev discussions 2015-09-09 08:14:11 +00:00
DEPS Update V8 DEPS. 2015-11-11 04:26:08 +00:00
LICENSE Updates to the license information of third party components. 2015-06-16 12:37:50 +00:00
LICENSE.strongtalk Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.v8 Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
LICENSE.valgrind Add LICENSE.v8, LICENSE.strongtalk and LICENSE.valgrind to the v8 2011-02-03 07:10:06 +00:00
Makefile MIPS64: Add big-endian support for mips64. 2015-09-29 17:23:55 +00:00
Makefile.android Reland [android] Migrate more configs to gyp. 2015-06-26 12:04:09 +00:00
Makefile.nacl Use the pnacl-clang toolchain for (P)NaCL builds 2014-10-06 08:10:50 +00:00
OWNERS Update OWNERS file. 2015-07-16 11:37:51 +00:00
PRESUBMIT.py Remove unused function in presubmit script 2015-09-23 10:52:45 +00:00
README.md [Docs] Add information on how to contribute to the README 2015-09-15 07:53:13 +00:00
snapshot_toolchain.gni Split the GN 'snapshot_toolchain' logic out into an include file. 2015-09-22 02:28:40 +00:00
WATCHLISTS Add an interpreter watchlist 2015-10-23 15:43:37 +00:00

README.md

V8 JavaScript Engine

V8 is Google's open source JavaScript engine.

V8 implements ECMAScript as specified in ECMA-262.

V8 is written in C++ and is used in Google Chrome, the open source browser from Google.

V8 can run standalone, or can be embedded into any C++ application.

V8 Project page: https://code.google.com/p/v8/

Getting the Code

Checkout depot tools, and run

    fetch v8

This will checkout V8 into the directory v8 and fetch all of its dependencies. To stay up to date, run

    git pull origin
    gclient sync

For fetching all branches, add the following into your remote configuration in .git/config:

    fetch = +refs/branch-heads/*:refs/remotes/branch-heads/*
    fetch = +refs/tags/*:refs/tags/*

Contributing

Please follow the instructions mentioned on the V8 wiki.