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Leszek Swirski 5b8782830b [offthread] Check memory pressure after merging 
Currently, there is no indication of memory pressure after merging pages
from off-thread space into the heap. This can mean that with lots of
off-thread compilations, we eventually run out of pages in the memory
allocator.

Now, trigger a critical memory pressure notification after merging if
the old generation is close to being unexpandable. We may want to add
other heuristics here (e.g. moderate memory pressure if the heap is
highly fragmented), or possibly add similar checks when the off-thread
space is initialized, but this works for now.

As a drive-by, inline the NotifyOffThreadSpaceMerged call into the
off-thread factory merge -- we already do a bunch of special merging
stuff in there, and nowhere else, so we may as well be explicit in what
we're actually doing. This also allows us to do a pre-check on old-space
size and hard limits just before the merge.

Bug: chromium:1011762
Change-Id: Ic2b46057cf751bd7eaf787f46beaaf4df36e78fe
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2131915
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67357}
2020-04-24 08:26:32 +00:00
build_overrides [tracing] Migrate tracing to Perfetto track events 2020-04-17 21:31:24 +00:00
custom_deps Use relative paths to OWNERS files 2019-08-12 13:52:52 +00:00
docs Add OWNERS for docs/ 2019-05-15 12:06:15 +00:00
gni [tracing] Migrate tracing to Perfetto track events 2020-04-17 21:31:24 +00:00
include cppgc: Add public target to build against 2020-04-21 12:48:23 +00:00
infra Configure ARM builder for CFI protection testing 2020-04-17 09:15:56 +00:00
samples [api] Create v8::String::NewFromLiteral that returns Local<String> 2020-03-09 12:02:07 +00:00
src [offthread] Check memory pressure after merging 2020-04-24 08:26:32 +00:00
test Reland "[offthread] Move stress-background-compile to compiler.cc" 2020-04-24 08:19:42 +00:00
testing Roll v8/third_party/googletest/src/ 10b1902d8..e3f0319d8 (43 commits) 2020-04-15 07:23:10 +00:00
third_party [tracing] Migrate tracing to Perfetto track events 2020-04-17 21:31:24 +00:00
tools [wasm] Update spec tests 2020-04-22 15:26:15 +00:00
.clang-format [clang-format] Don't derive pointer alignment 2017-01-17 09:28:19 +00:00
.clang-tidy [tool] Remove unfixed clang-tidy warnings to ease use. 2018-10-26 07:40:32 +00:00
.editorconfig Add .editorconfig 2017-07-28 13:39:24 +00:00
.flake8 Add .flake8 to allow for python style checking. 2019-07-19 21:44:03 +00:00
.git-blame-ignore-revs [infra] Update .git-blame-ignore-revs 2020-03-03 12:59:13 +00:00
.gitattributes .gitattributes: Mark minified emscripten js files as -diff 2018-09-19 16:27:10 +00:00
.gitignore [tracing] Migrate tracing to Perfetto track events 2020-04-17 21:31:24 +00:00
.gn [build] Dynamically decide if to use system xcode 2019-07-29 08:20:24 +00:00
.vpython [tools] Implement confidence-based number of runs 2019-05-09 09:42:28 +00:00
.ycm_extra_conf.py Fix ycm config for headers without source 2019-12-09 11:59:21 +00:00
AUTHORS [builtins][MIPS]: Workaround gas auto-align issue 2020-04-17 09:36:25 +00:00
BUILD.gn [snapshot] Rename the partial-* files to context-* 2020-04-23 12:41:22 +00:00
CODE_OF_CONDUCT.md Explicitly state that the Chromium Code of Conduct also applies to V8 2016-03-02 09:51:24 +00:00
codereview.settings Make Gerrit the default code review for V8 2017-06-30 17:37:37 +00:00
COMMON_OWNERS heap: Add Oilpan folks to COMMON_OWNERS 2020-04-14 08:55:52 +00:00
DEPS Roll test262 2020-04-24 06:48:52 +00:00
ENG_REVIEW_OWNERS Add eng review owners as escalation path 2019-05-15 19:12:10 +00:00
INFRA_OWNERS Remove myself from owners 2019-12-12 14:22:32 +00:00
INTL_OWNERS Add missing owners files 2019-05-31 07:21:01 +00:00
LICENSE [wasm] Draft version of C/C++ Wasm API 2019-04-17 16:00:26 +00:00
LICENSE.fdlibm Add LICENSE.fdlibm for all the fdlibm imported sources. 2016-06-09 07:17:03 +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
MIPS_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
OWNERS Add syg@chromium.org as DEPS owner for test262 rolls 2019-09-17 19:29:11 +00:00
PPC_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
PRESUBMIT.py Remove the #undef check from the Presubmit for .cc files 2020-01-24 15:24:51 +00:00
README.md [docs] Change links from old wiki to v8.dev 2019-03-07 12:13:30 +00:00
S390_OWNERS Move architecture dependent files 2019-05-28 14:02:15 +00:00
WATCHLISTS Stop watching for API changes in WATCHLISTS 2020-04-08 07:06:45 +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://v8.dev/docs

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 at v8.dev/docs/contribute.