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To: gentoo-dev@g.o
From: Alexandre Rostovtsev <tetromino@g.o>
Subject: Re: RFC: new global USE flag: jit
Date: Sat, 19 May 2012 06:19:55 -0400
On Mon, 2012-05-14 at 14:05 -0400, Alexandre Rostovtsev wrote:
> I propose adding the following global USE flag:
> 
> jit - Enable just-in-time compilation for improved performance. May
> prevent use of some PaX memory protection features in Gentoo Hardened.
> 
> 
> Current local flags that could probably be unified:
> 
> app-arch/libzpaq:jit - Enable just-in-time compilation for faster
> compression (requires SSE2)
> 
> dev-libs/libpcre:jit - Enable Just-In-Time compilation of regexp
> bytecode to machine code, through the SLJIT compiler. This feature might
> conflict wtih security mitigation strategies such as NX/PaX as enabled
> by Gentoo Hardened.
> 
> dev-python/pypy:jit - Enable the JIT compiler
> 
> dev-scheme/racket:jit - Enable just-in-time compiler
> 
> media-sound/csound:luajit - Use the lua just-in-time compiler
> dev-lang/luajit instead of dev-lang/lua
> 
> net-libs/webkit-gtk:jit - Enable JIT javascript compiler (disabling it
> will cause performance penalty)
> 
> www-client/epiphany:jit - Allow using net-libs/webkit-gtk that has the
> JIT javascript compiler enabled
> 
> www-client/luakit:luajit - Use the lua just-in-time compiler
> dev-lang/luajit instead of dev-lang/lua, which should make luakit
> faster.
> 
> www-client/seamonkey:methodjit - Enable JIT for JavaScript using
> MethodJIT for faster JS performance. Hardened users can disable this
> USE-flag to use MPROTECT on grsecurity kernels.
> 
> www-servers/nginx:pcre-jit - Enable JIT for pcre
> 
> x11-libs/qt-core:jit - Enables JIT for Javascript usage inside Qt
> 
> x11-libs/qt-script:jit - Enables JIT for Javascript usage inside Qt
> 
> x11-libs/qt-webkit:jit - Enable JavaScriptCore just-in-time compiler for
> faster JavaScript execution
> 
> -Alexandre.

Update: since the response to the proposal was favorable, jit has now
been added to use.desc. Two packages, webkit-gtk and epiphany, have
switched to the global flag already; bugs (#416601, #416603, #416605,
#416607, #416609, #416611) have been filed with maintainers of the other
packages most likely to benefit from the new flag.

-Alexandre.




References:
RFC: new global USE flag: jit
-- Alexandre Rostovtsev
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Updated Jun 29, 2012

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