85ba94f28c
Reason for revert: [Sheriff] Leads to crashes on all webrtc chromium testers, e.g.: https://build.chromium.org/p/chromium.webrtc/builders/Mac%20Tester/builds/49664 Original issue's description: > [heap] Parallel newspace evacuation, semispace copy, and compaction \o/ > > All parallelism can be turned off using --predictable, or --noparallel-compaction. > > This patch completely parallelizes > - semispace copy: from space -> to space (within newspace) > - newspace evacuation: newspace -> oldspace > - oldspace compaction: oldspace -> oldspace > > Previously newspace has been handled sequentially (semispace copy, newspace > evacuation) before compacting oldspace in parallel. However, on a high level > there are no dependencies between those two actions, hence we parallelize them > altogether. We base the number of evacuation tasks on the overall set of > to-be-processed pages (newspace + oldspace compaction pages). > > Some low-level details: > - The hard cap on number of tasks has been lifted > - We cache store buffer entries locally before merging them back into the global > StoreBuffer in a finalization phase. > - We cache AllocationSite operations locally before merging them back into the > global pretenuring storage in a finalization phase. > - AllocationSite might be compacted while they would be needed for newspace > evacuation. To mitigate any problems we defer checking allocation sites for > newspace till merging locally buffered data. > > CQ_EXTRA_TRYBOTS=tryserver.v8:v8_linux_arm64_gc_stress_dbg,v8_linux_gc_stress_dbg,v8_mac_gc_stress_dbg,v8_linux64_asan_rel,v8_linux64_tsan_rel,v8_mac64_asan_rel > BUG=chromium:524425 > LOG=N > R=hpayer@chromium.org, ulan@chromium.org > > Committed: https://crrev.com/8f0fd8c0370ae8c5aab56491b879d7e30c329062 > Cr-Commit-Position: refs/heads/master@{#33523} TBR=hpayer@chromium.org,ulan@chromium.org,mlippautz@chromium.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=chromium:524425 Review URL: https://codereview.chromium.org/1643473002 Cr-Commit-Position: refs/heads/master@{#33539} |
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| benchmarks | ||
| build | ||
| docs | ||
| include | ||
| infra | ||
| samples | ||
| src | ||
| test | ||
| testing | ||
| third_party/binutils | ||
| tools | ||
| .clang-format | ||
| .gitignore | ||
| .ycm_extra_conf.py | ||
| AUTHORS | ||
| BUILD.gn | ||
| ChangeLog | ||
| codereview.settings | ||
| DEPS | ||
| LICENSE | ||
| LICENSE.strongtalk | ||
| LICENSE.v8 | ||
| LICENSE.valgrind | ||
| Makefile | ||
| Makefile.android | ||
| Makefile.nacl | ||
| OWNERS | ||
| PRESUBMIT.py | ||
| README.md | ||
| snapshot_toolchain.gni | ||
| WATCHLISTS | ||
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://github.com/v8/v8/wiki
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.