Re: [gentoo-dev] RFC: new global USE flag: jit

[Agostino Sarubbo]

On Monday 14 May 2012 14:05:12 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.
+1
-- 
Agostino Sarubbo		ago -at- gentoo.org
Gentoo/AMD64 Arch Security Liaison
GPG: 0x7CD2DC5D